||
!traits_type::eq(__c, this->gptr()[-1]), false))
__ret = this->pbackfail(traits_type::to_int_type(__c));
else
{
this->gbump(-1);
__ret = traits_type::to_int_type(*this->gptr());
}
return __ret;
}
/**
* @brief Moving backwards in the input stream.
* @return The previous character, if possible.
*
* If a putback position is available, this function decrements the
* input pointer and returns that character. Otherwise, calls and
* returns pbackfail(). The effect is to "unget" the last character
* "gotten".
*/
int_type
sungetc()
{
int_type __ret;
if (__builtin_expect(this->eback() < this->gptr(), true))
{
this->gbump(-1);
__ret = traits_type::to_int_type(*this->gptr());
}
else
__ret = this->pbackfail();
return __ret;
}
// [27.5.2.2.5] put area
/**
* @brief Entry point for all single-character output functions.
* @param c A character to output.
* @return @a c, if possible.
*
* One of two public output functions.
*
* If a write position is available for the output sequence (i.e.,
* the buffer is not full), stores @a c in that position, increments
* the position, and returns @c traits::to_int_type(c). If a write
* position is not available, returns @c overflow(c).
*/
int_type
sputc(char_type __c)
{
int_type __ret;
if (__builtin_expect(this->pptr() < this->epptr(), true))
{
*this->pptr() = __c;
this->pbump(1);
__ret = traits_type::to_int_type(__c);
}
else
__ret = this->overflow(traits_type::to_int_type(__c));
return __ret;
}
/**
* @brief Entry point for all single-character output functions.
* @param s A buffer read area.
* @param n A count.
*
* One of two public output functions.
*
*
* Returns xsputn(s,n). The effect is to write @a s[0] through
* @a s[n-1] to the output sequence, if possible.
*/
streamsize
sputn(const char_type* __s, streamsize __n)
{ return this->xsputn(__s, __n); }
protected:
/**
* @brief Base constructor.
*
* Only called from derived constructors, and sets up all the
* buffer data to zero, including the pointers described in the
* basic_streambuf class description. Note that, as a result,
* - the class starts with no read nor write positions available,
* - this is not an error
*/
basic_streambuf()
: _M_in_beg(0), _M_in_cur(0), _M_in_end(0),
_M_out_beg(0), _M_out_cur(0), _M_out_end(0),
_M_buf_locale(locale())
{ }
// [27.5.2.3.1] get area access
//@{
/**
* @brief Access to the get area.
*
* These functions are only available to other protected functions,
* including derived classes.
*
* - eback() returns the beginning pointer for the input sequence
* - gptr() returns the next pointer for the input sequence
* - egptr() returns the end pointer for the input sequence
*/
char_type*
eback() const { return _M_in_beg; }
char_type*
gptr() const { return _M_in_cur; }
char_type*
egptr() const { return _M_in_end; }
//@}
/**
* @brief Moving the read position.
* @param n The delta by which to move.
*
* This just advances the read position without returning any data.
*/
void
gbump(int __n) { _M_in_cur += __n; }
/**
* @brief Setting the three read area pointers.
* @param gbeg A pointer.
* @param gnext A pointer.
* @param gend A pointer.
* @post @a gbeg == @c eback(), @a gnext == @c gptr(), and
* @a gend == @c egptr()
*/
void
setg(char_type* __gbeg, char_type* __gnext, char_type* __gend)
{
_M_in_beg = __gbeg;
_M_in_cur = __gnext;
_M_in_end = __gend;
}
// [27.5.2.3.2] put area access
//@{
/**
* @brief Access to the put area.
*
* These functions are only available to other protected functions,
* including derived classes.
*
* - pbase() returns the beginning pointer for the output sequence
* - pptr() returns the next pointer for the output sequence
* - epptr() returns the end pointer for the output sequence
*/
char_type*
pbase() const { return _M_out_beg; }
char_type*
pptr() const { return _M_out_cur; }
char_type*
epptr() const { return _M_out_end; }
//@}
/**
* @brief Moving the write position.
* @param n The delta by which to move.
*
* This just advances the write position without returning any data.
*/
void
pbump(int __n) { _M_out_cur += __n; }
/**
* @brief Setting the three write area pointers.
* @param pbeg A pointer.
* @param pend A pointer.
* @post @a pbeg == @c pbase(), @a pbeg == @c pptr(), and
* @a pend == @c epptr()
*/
void
setp(char_type* __pbeg, char_type* __pend)
{
_M_out_beg = _M_out_cur = __pbeg;
_M_out_end = __pend;
}
// [27.5.2.4] virtual functions
// [27.5.2.4.1] locales
/**
* @brief Changes translations.
* @param loc A new locale.
*
* Translations done during I/O which depend on the current locale
* are changed by this call. The standard adds, "Between invocations
* of this function a class derived from streambuf can safely cache
* results of calls to locale functions and to members of facets
* so obtained."
*
* @note Base class version does nothing.
*/
virtual void
imbue(const locale&)
{ }
// [27.5.2.4.2] buffer management and positioning
/**
* @brief Manipulates the buffer.
*
* Each derived class provides its own appropriate behavior. See
* the next-to-last paragraph of
* http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
* for more on this function.
*
* @note Base class version does nothing, returns @c this.
*/
virtual basic_streambuf<char_type,_Traits>*
setbuf(char_type*, streamsize)
{ return this; }
/**
* @brief Alters the stream positions.
*
* Each derived class provides its own appropriate behavior.
* @note Base class version does nothing, returns a @c pos_type
* that represents an invalid stream position.
*/
virtual pos_type
seekoff(off_type, ios_base::seekdir,
ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
{ return pos_type(off_type(-1)); }
/**
* @brief Alters the stream positions.
*
* Each derived class provides its own appropriate behavior.
* @note Base class version does nothing, returns a @c pos_type
* that represents an invalid stream position.
*/
virtual pos_type
seekpos(pos_type,
ios_base::openmode /*__mode*/ = ios_base::in | ios_base::out)
{ return pos_type(off_type(-1)); }
/**
* @brief Synchronizes the buffer arrays with the controlled sequences.
* @return -1 on failure.
*
* Each derived class provides its own appropriate behavior,
* including the definition of "failure".
* @note Base class version does nothing, returns zero.
*/
virtual int
sync() { return 0; }
// [27.5.2.4.3] get area
/**
* @brief Investigating the data available.
* @return An estimate of the number of characters available in the
* input sequence, or -1.
*
* "If it returns a positive value, then successive calls to
* @c underflow() will not return @c traits::eof() until at least that
* number of characters have been supplied. If @c showmanyc()
* returns -1, then calls to @c underflow() or @c uflow() will fail."
* [27.5.2.4.3]/1
*
* @note Base class version does nothing, returns zero.
* @note The standard adds that "the intention is not only that the
* calls [to underflow or uflow] will not return @c eof() but
* that they will return "immediately".
* @note The standard adds that "the morphemes of @c showmanyc are
* "es-how-many-see", not "show-manic".
*/
virtual streamsize
showmanyc() { return 0; }
/**
* @brief Multiple character extraction.
* @param s A buffer area.
* @param n Maximum number of characters to assign.
* @return The number of characters assigned.
*
* Fills @a s[0] through @a s[n-1] with characters from the input
* sequence, as if by @c sbumpc(). Stops when either @a n characters
* have been copied, or when @c traits::eof() would be copied.
*
* It is expected that derived classes provide a more efficient
* implementation by overriding this definition.
*/
virtual streamsize
xsgetn(char_type* __s, streamsize __n);
/**
* @brief Fetches more data from the controlled sequence.
* @return The first character from the <em>pending sequence</em>.
*
* Informally, this function is called when the input buffer is
* exhausted (or does not exist, as buffering need not actually be
* done). If a buffer exists, it is "refilled". In either case, the
* next available character is returned, or @c traits::eof() to
* indicate a null pending sequence.
*
* For a formal definition of the pending sequence, see a good text
* such as Langer & Kreft, or [27.5.2.4.3]/7-14.
*
* A functioning input streambuf can be created by overriding only
* this function (no buffer area will be used). For an example, see
* http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25.html
*
* @note Base class version does nothing, returns eof().
*/
virtual int_type
underflow()
{ return traits_type::eof(); }
/**
* @brief Fetches more data from the controlled sequence.
* @return The first character from the <em>pending sequence</em>.
*
* Informally, this function does the same thing as @c underflow(),
* and in fact is required to call that function. It also returns
* the new character, like @c underflow() does. However, this
* function also moves the read position forward by one.
*/
virtual int_type
uflow()
{
int_type __ret = traits_type::eof();
const bool __testeof = traits_type::eq_int_type(this->underflow(),
__ret);
if (!__testeof)
{
__ret = traits_type::to_int_type(*this->gptr());
this->gbump(1);
}
return __ret;
}
// [27.5.2.4.4] putback
/**
* @brief Tries to back up the input sequence.
* @param c The character to be inserted back into the sequence.
* @return eof() on failure, "some other value" on success
* @post The constraints of @c gptr(), @c eback(), and @c pptr()
* are the same as for @c underflow().
*
* @note Base class version does nothing, returns eof().
*/
virtual int_type
pbackfail(int_type /* __c */ = traits_type::eof())
{ return traits_type::eof(); }
// Put area:
/**
* @brief Multiple character insertion.
* @param s A buffer area.
* @param n Maximum number of characters to write.
* @return The number of characters written.
*
* Writes @a s[0] through @a s[n-1] to the output sequence, as if
* by @c sputc(). Stops when either @a n characters have been
* copied, or when @c sputc() would return @c traits::eof().
*
* It is expected that derived classes provide a more efficient
* implementation by overriding this definition.
*/
virtual streamsize
xsputn(const char_type* __s, streamsize __n);
/**
* @brief Consumes data from the buffer; writes to the
* controlled sequence.
* @param c An additional character to consume.
* @return eof() to indicate failure, something else (usually
* @a c, or not_eof())
*
* Informally, this function is called when the output buffer is full
* (or does not exist, as buffering need not actually be done). If a
* buffer exists, it is "consumed", with "some effect" on the
* controlled sequence. (Typically, the buffer is written out to the
* sequence verbatim.) In either case, the character @a c is also
* written out, if @a c is not @c eof().
*
* For a formal definition of this function, see a good text
* such as Langer & Kreft, or [27.5.2.4.5]/3-7.
*
* A functioning output streambuf can be created by overriding only
* this function (no buffer area will be used).
*
* @note Base class version does nothing, returns eof().
*/
virtual int_type
overflow(int_type /* __c */ = traits_type::eof())
{ return traits_type::eof(); }
#if _GLIBCXX_DEPRECATED
// Annex D.6
public:
/**
* @brief Tosses a character.
*
* Advances the read pointer, ignoring the character that would have
* been read.
*
* See http://gcc.gnu.org/ml/libstdc++/2002-05/msg00168.html
*/
void
stossc()
{
if (this->gptr() < this->egptr())
this->gbump(1);
else
this->uflow();
}
#endif
private:
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// Side effect of DR 50.
basic_streambuf(const __streambuf_type& __sb)
: _M_in_beg(__sb._M_in_beg), _M_in_cur(__sb._M_in_cur),
_M_in_end(__sb._M_in_end), _M_out_beg(__sb._M_out_beg),
_M_out_cur(__sb._M_out_cur), _M_out_end(__sb._M_out_cur),
_M_buf_locale(__sb._M_buf_locale)
{ }
__streambuf_type&
operator=(const __streambuf_type&) { return *this; };
};
// Explicit specialization declarations, defined in src/streambuf.cc.
template<>
streamsize
__copy_streambufs_eof(basic_streambuf<char>* __sbin,
basic_streambuf<char>* __sbout, bool& __ineof);
#ifdef _GLIBCXX_USE_WCHAR_T
template<>
streamsize
__copy_streambufs_eof(basic_streambuf<wchar_t>* __sbin,
basic_streambuf<wchar_t>* __sbout, bool& __ineof);
#endif
_GLIBCXX_END_NAMESPACE
#ifndef _GLIBCXX_EXPORT_TEMPLATE
# include <bits/streambuf.tcc>
#endif
#endif /* _GLIBCXX_STREAMBUF */
��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������// -*- C++ -*- forwarding header.
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2008
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file include/cstdarg
* This is a Standard C++ Library file. You should @c #include this file
* in your programs, rather than any of the "*.h" implementation files.
*
* This is the C++ version of the Standard C Library header @c stdarg.h,
* and its contents are (mostly) the same as that header, but are all
* contained in the namespace @c std (except for names which are defined
* as macros in C).
*/
//
// ISO C++ 14882: 20.4.6 C library
//
#pragma GCC system_header
#include <bits/c++config.h>
#include <stdarg.h>
#ifndef _GLIBCXX_CSTDARG
#define _GLIBCXX_CSTDARG 1
// Adhere to section 17.4.1.2 clause 5 of ISO 14882:1998
#ifndef va_end
#define va_end(ap) va_end (ap)
#endif
_GLIBCXX_BEGIN_NAMESPACE(std)
using ::va_list;
_GLIBCXX_END_NAMESPACE
#endif
����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������// -*- C++ -*- forwarding header.
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2008
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file include/cwchar
* This is a Standard C++ Library file. You should @c #include this file
* in your programs, rather than any of the "*.h" implementation files.
*
* This is the C++ version of the Standard C Library header @c wchar.h,
* and its contents are (mostly) the same as that header, but are all
* contained in the namespace @c std (except for names which are defined
* as macros in C).
*/
//
// ISO C++ 14882: 21.4
//
#pragma GCC system_header
#include <bits/c++config.h>
#include <cstddef>
#if _GLIBCXX_HAVE_WCHAR_H
#include <wchar.h>
#endif
#ifndef _GLIBCXX_CWCHAR
#define _GLIBCXX_CWCHAR 1
// Need to do a bit of trickery here with mbstate_t as char_traits
// assumes it is in wchar.h, regardless of wchar_t specializations.
#ifndef _GLIBCXX_HAVE_MBSTATE_T
extern "C"
{
typedef struct
{
int __fill[6];
} mbstate_t;
}
#endif
_GLIBCXX_BEGIN_NAMESPACE(std)
using ::mbstate_t;
_GLIBCXX_END_NAMESPACE
// Get rid of those macros defined in <wchar.h> in lieu of real functions.
#undef btowc
#undef fgetwc
#undef fgetws
#undef fputwc
#undef fputws
#undef fwide
#undef fwprintf
#undef fwscanf
#undef getwc
#undef getwchar
#undef mbrlen
#undef mbrtowc
#undef mbsinit
#undef mbsrtowcs
#undef putwc
#undef putwchar
#undef swprintf
#undef swscanf
#undef ungetwc
#undef vfwprintf
#if _GLIBCXX_HAVE_VFWSCANF
# undef vfwscanf
#endif
#undef vswprintf
#if _GLIBCXX_HAVE_VSWSCANF
# undef vswscanf
#endif
#undef vwprintf
#if _GLIBCXX_HAVE_VWSCANF
# undef vwscanf
#endif
#undef wcrtomb
#undef wcscat
#undef wcschr
#undef wcscmp
#undef wcscoll
#undef wcscpy
#undef wcscspn
#undef wcsftime
#undef wcslen
#undef wcsncat
#undef wcsncmp
#undef wcsncpy
#undef wcspbrk
#undef wcsrchr
#undef wcsrtombs
#undef wcsspn
#undef wcsstr
#undef wcstod
#if _GLIBCXX_HAVE_WCSTOF
# undef wcstof
#endif
#undef wcstok
#undef wcstol
#undef wcstoul
#undef wcsxfrm
#undef wctob
#undef wmemchr
#undef wmemcmp
#undef wmemcpy
#undef wmemmove
#undef wmemset
#undef wprintf
#undef wscanf
#if _GLIBCXX_USE_WCHAR_T
_GLIBCXX_BEGIN_NAMESPACE(std)
using ::wint_t;
using ::btowc;
using ::fgetwc;
using ::fgetws;
using ::fputwc;
using ::fputws;
using ::fwide;
using ::fwprintf;
using ::fwscanf;
using ::getwc;
using ::getwchar;
using ::mbrlen;
using ::mbrtowc;
using ::mbsinit;
using ::mbsrtowcs;
using ::putwc;
using ::putwchar;
using ::swprintf;
using ::swscanf;
using ::ungetwc;
using ::vfwprintf;
#if _GLIBCXX_HAVE_VFWSCANF
using ::vfwscanf;
#endif
using ::vswprintf;
#if _GLIBCXX_HAVE_VSWSCANF
using ::vswscanf;
#endif
using ::vwprintf;
#if _GLIBCXX_HAVE_VWSCANF
using ::vwscanf;
#endif
using ::wcrtomb;
using ::wcscat;
using ::wcscmp;
using ::wcscoll;
using ::wcscpy;
using ::wcscspn;
using ::wcsftime;
using ::wcslen;
using ::wcsncat;
using ::wcsncmp;
using ::wcsncpy;
using ::wcsrtombs;
using ::wcsspn;
using ::wcstod;
#if _GLIBCXX_HAVE_WCSTOF
using ::wcstof;
#endif
using ::wcstok;
using ::wcstol;
using ::wcstoul;
using ::wcsxfrm;
using ::wctob;
using ::wmemcmp;
using ::wmemcpy;
using ::wmemmove;
using ::wmemset;
using ::wprintf;
using ::wscanf;
using ::wcschr;
inline wchar_t*
wcschr(wchar_t* __p, wchar_t __c)
{ return wcschr(const_cast<const wchar_t*>(__p), __c); }
using ::wcspbrk;
inline wchar_t*
wcspbrk(wchar_t* __s1, const wchar_t* __s2)
{ return wcspbrk(const_cast<const wchar_t*>(__s1), __s2); }
using ::wcsrchr;
inline wchar_t*
wcsrchr(wchar_t* __p, wchar_t __c)
{ return wcsrchr(const_cast<const wchar_t*>(__p), __c); }
using ::wcsstr;
inline wchar_t*
wcsstr(wchar_t* __s1, const wchar_t* __s2)
{ return wcsstr(const_cast<const wchar_t*>(__s1), __s2); }
using ::wmemchr;
inline wchar_t*
wmemchr(wchar_t* __p, wchar_t __c, size_t __n)
{ return wmemchr(const_cast<const wchar_t*>(__p), __c, __n); }
_GLIBCXX_END_NAMESPACE
#if _GLIBCXX_USE_C99
#undef wcstold
#undef wcstoll
#undef wcstoull
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
#if _GLIBCXX_USE_C99_CHECK || _GLIBCXX_USE_C99_DYNAMIC
extern "C" long double
(wcstold)(const wchar_t * restrict, wchar_t ** restrict);
#endif
#if !_GLIBCXX_USE_C99_DYNAMIC
using ::wcstold;
#endif
#if _GLIBCXX_USE_C99_LONG_LONG_CHECK || _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
extern "C" long long int
(wcstoll)(const wchar_t * restrict, wchar_t ** restrict, int);
extern "C" unsigned long long int
(wcstoull)(const wchar_t * restrict, wchar_t ** restrict, int);
#endif
#if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
using ::wcstoll;
using ::wcstoull;
#endif
_GLIBCXX_END_NAMESPACE
_GLIBCXX_BEGIN_NAMESPACE(std)
using ::__gnu_cxx::wcstold;
using ::__gnu_cxx::wcstoll;
using ::__gnu_cxx::wcstoull;
_GLIBCXX_END_NAMESPACE
#endif
#endif //_GLIBCXX_USE_WCHAR_T
#ifdef __GXX_EXPERIMENTAL_CXX0X__
# if defined(_GLIBCXX_INCLUDE_AS_TR1)
# error C++0x header cannot be included from TR1 header
# endif
# if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
# include <tr1_impl/cwchar>
# else
# define _GLIBCXX_INCLUDE_AS_CXX0X
# define _GLIBCXX_BEGIN_NAMESPACE_TR1
# define _GLIBCXX_END_NAMESPACE_TR1
# define _GLIBCXX_TR1
# include <tr1_impl/cwchar>
# undef _GLIBCXX_TR1
# undef _GLIBCXX_END_NAMESPACE_TR1
# undef _GLIBCXX_BEGIN_NAMESPACE_TR1
# undef _GLIBCXX_INCLUDE_AS_CXX0X
# endif
#endif
#endif
�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������// <deque> -*- C++ -*-
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING. If not, write to
// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
// Boston, MA 02110-1301, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file include/deque
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_DEQUE
#define _GLIBCXX_DEQUE 1
#pragma GCC system_header
#include <bits/stl_algobase.h>
#include <bits/allocator.h>
#include <bits/stl_construct.h>
#include <bits/stl_uninitialized.h>
#include <bits/stl_deque.h>
#ifndef _GLIBCXX_EXPORT_TEMPLATE
# include <bits/deque.tcc>
#endif
#ifdef _GLIBCXX_DEBUG
# include <debug/deque>
#endif
#endif /* _GLIBCXX_DEQUE */
�������������������������������������������������������������������������B�� �.��� ��� �..��C���
type_traits.h���D�� �bitmap_allocator.h��E��$�codecvt_specializations.h���F���
concurrence.h���G���
vstring_fwd.h���H���mt_allocator.h��I�� �pod_char_traits.h���J��� algorithm���K�� �array_allocator.h���L���iteratorM���numeric_traits.hN���numeric�O��� vstring.h���P��� vstring.tcc�Q���slist���R���pool_allocator.hS���pb_ds���u���hash_setv�� �stdio_sync_filebuf.hw���memory��x�� �throw_allocator.h���y�� �sso_string_base.h���z���
enc_filebuf.h���{���vstring_util.h��|�� �debug_allocator.h���}��� atomicity.h�~���hash_map���
ropeimpl.h��€�� �malloc_allocator.h���� �rope‚���
typelist.h��ƒ���rb_tree�„���rc_string_base.h…���new_allocator.h�†���
functional��‡��Ü�stdio_filebuf.h�����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������// -*- C++ -*-
// Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 2, or (at your option) any later
// version.
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free
// software library without restriction. Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License. This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.
/** @file ext/type_traits.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _EXT_TYPE_TRAITS
#define _EXT_TYPE_TRAITS 1
#pragma GCC system_header
#include <bits/c++config.h>
#include <bits/cpp_type_traits.h>
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
// Define a nested type if some predicate holds.
template<bool, typename>
struct __enable_if
{ };
template<typename _Tp>
struct __enable_if<true, _Tp>
{ typedef _Tp __type; };
// Conditional expression for types. If true, first, if false, second.
template<bool _Cond, typename _Iftrue, typename _Iffalse>
struct __conditional_type
{ typedef _Iftrue __type; };
template<typename _Iftrue, typename _Iffalse>
struct __conditional_type<false, _Iftrue, _Iffalse>
{ typedef _Iffalse __type; };
// Given an integral builtin type, return the corresponding unsigned type.
template<typename _Tp>
struct __add_unsigned
{
private:
typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
public:
typedef typename __if_type::__type __type;
};
template<>
struct __add_unsigned<char>
{ typedef unsigned char __type; };
template<>
struct __add_unsigned<signed char>
{ typedef unsigned char __type; };
template<>
struct __add_unsigned<short>
{ typedef unsigned short __type; };
template<>
struct __add_unsigned<int>
{ typedef unsigned int __type; };
template<>
struct __add_unsigned<long>
{ typedef unsigned long __type; };
template<>
struct __add_unsigned<long long>
{ typedef unsigned long long __type; };
// Declare but don't define.
template<>
struct __add_unsigned<bool>;
template<>
struct __add_unsigned<wchar_t>;
// Given an integral builtin type, return the corresponding signed type.
template<typename _Tp>
struct __remove_unsigned
{
private:
typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
public:
typedef typename __if_type::__type __type;
};
template<>
struct __remove_unsigned<char>
{ typedef signed char __type; };
template<>
struct __remove_unsigned<unsigned char>
{ typedef signed char __type; };
template<>
struct __remove_unsigned<unsigned short>
{ typedef short __type; };
template<>
struct __remove_unsigned<unsigned int>
{ typedef int __type; };
template<>
struct __remove_unsigned<unsigned long>
{ typedef long __type; };
template<>
struct __remove_unsigned<unsigned long long>
{ typedef long long __type; };
// Declare but don't define.
template<>
struct __remove_unsigned<bool>;
template<>
struct __remove_unsigned<wchar_t>;
// For use in string and vstring.
template<typename _Type>
inline bool
__is_null_pointer(_Type* __ptr)
{ return __ptr == 0; }
template<typename _Type>
inline bool
__is_null_pointer(_Type)
{ return false; }
// For complex and cmath
template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
struct __promote
{ typedef double __type; };
template<typename _Tp>
struct __promote<_Tp, false>
{ typedef _Tp __type; };
template<typename _Tp, typename _Up>
struct __promote_2
{
private:
typedef typename __promote<_Tp>::__type __type1;
typedef typename __promote<_Up>::__type __type2;
public:
typedef __typeof__(__type1() + __type2()) __type;
};
template<typename _Tp, typename _Up, typename _Vp>
struct __promote_3
{
private:
typedef typename __promote<_Tp>::__type __type1;
typedef typename __promote<_Up>::__type __type2;
typedef typename __promote<_Vp>::__type __type3;
public:
typedef __typeof__(__type1() + __type2() + __type3()) __type;
};
template<typename _Tp, typename _Up, typename _Vp, typename _Wp>
struct __promote_4
{
private:
typedef typename __promote<_Tp>::__type __type1;
typedef typename __promote<_Up>::__type __type2;
typedef typename __promote<_Vp>::__type __type3;
typedef typename __promote<_Wp>::__type __type4;
public:
typedef __typeof__(__type1() + __type2() + __type3() + __type4()) __type;
};
_GLIBCXX_END_NAMESPACE
#endif
����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������// Bitmap Allocator. -*- C++ -*-
// Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file ext/bitmap_allocator.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _BITMAP_ALLOCATOR_H
#define _BITMAP_ALLOCATOR_H 1
#include <cstddef> // For std::size_t, and ptrdiff_t.
#include <bits/functexcept.h> // For __throw_bad_alloc().
#include <utility> // For std::pair.
#include <functional> // For greater_equal, and less_equal.
#include <new> // For operator new.
#include <debug/debug.h> // _GLIBCXX_DEBUG_ASSERT
#include <ext/concurrence.h>
#include <bits/stl_move.h>
/** @brief The constant in the expression below is the alignment
* required in bytes.
*/
#define _BALLOC_ALIGN_BYTES 8
_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
using std::size_t;
using std::ptrdiff_t;
namespace __detail
{
/** @class __mini_vector bitmap_allocator.h bitmap_allocator.h
*
* @brief __mini_vector<> is a stripped down version of the
* full-fledged std::vector<>.
*
* It is to be used only for built-in types or PODs. Notable
* differences are:
*
* @detail
* 1. Not all accessor functions are present.
* 2. Used ONLY for PODs.
* 3. No Allocator template argument. Uses ::operator new() to get
* memory, and ::operator delete() to free it.
* Caveat: The dtor does NOT free the memory allocated, so this a
* memory-leaking vector!
*/
template<typename _Tp>
class __mini_vector
{
__mini_vector(const __mini_vector&);
__mini_vector& operator=(const __mini_vector&);
public:
typedef _Tp value_type;
typedef _Tp* pointer;
typedef _Tp& reference;
typedef const _Tp& const_reference;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef pointer iterator;
private:
pointer _M_start;
pointer _M_finish;
pointer _M_end_of_storage;
size_type
_M_space_left() const throw()
{ return _M_end_of_storage - _M_finish; }
pointer
allocate(size_type __n)
{ return static_cast<pointer>(::operator new(__n * sizeof(_Tp))); }
void
deallocate(pointer __p, size_type)
{ ::operator delete(__p); }
public:
// Members used: size(), push_back(), pop_back(),
// insert(iterator, const_reference), erase(iterator),
// begin(), end(), back(), operator[].
__mini_vector() : _M_start(0), _M_finish(0),
_M_end_of_storage(0)
{ }
#if 0
~__mini_vector()
{
if (this->_M_start)
{
this->deallocate(this->_M_start, this->_M_end_of_storage
- this->_M_start);
}
}
#endif
size_type
size() const throw()
{ return _M_finish - _M_start; }
iterator
begin() const throw()
{ return this->_M_start; }
iterator
end() const throw()
{ return this->_M_finish; }
reference
back() const throw()
{ return *(this->end() - 1); }
reference
operator[](const size_type __pos) const throw()
{ return this->_M_start[__pos]; }
void
insert(iterator __pos, const_reference __x);
void
push_back(const_reference __x)
{
if (this->_M_space_left())
{
*this->end() = __x;
++this->_M_finish;
}
else
this->insert(this->end(), __x);
}
void
pop_back() throw()
{ --this->_M_finish; }
void
erase(iterator __pos) throw();
void
clear() throw()
{ this->_M_finish = this->_M_start; }
};
// Out of line function definitions.
template<typename _Tp>
void __mini_vector<_Tp>::
insert(iterator __pos, const_reference __x)
{
if (this->_M_space_left())
{
size_type __to_move = this->_M_finish - __pos;
iterator __dest = this->end();
iterator __src = this->end() - 1;
++this->_M_finish;
while (__to_move)
{
*__dest = *__src;
--__dest; --__src; --__to_move;
}
*__pos = __x;
}
else
{
size_type __new_size = this->size() ? this->size() * 2 : 1;
iterator __new_start = this->allocate(__new_size);
iterator __first = this->begin();
iterator __start = __new_start;
while (__first != __pos)
{
*__start = *__first;
++__start; ++__first;
}
*__start = __x;
++__start;
while (__first != this->end())
{
*__start = *__first;
++__start; ++__first;
}
if (this->_M_start)
this->deallocate(this->_M_start, this->size());
this->_M_start = __new_start;
this->_M_finish = __start;
this->_M_end_of_storage = this->_M_start + __new_size;
}
}
template<typename _Tp>
void __mini_vector<_Tp>::
erase(iterator __pos) throw()
{
while (__pos + 1 != this->end())
{
*__pos = __pos[1];
++__pos;
}
--this->_M_finish;
}
template<typename _Tp>
struct __mv_iter_traits
{
typedef typename _Tp::value_type value_type;
typedef typename _Tp::difference_type difference_type;
};
template<typename _Tp>
struct __mv_iter_traits<_Tp*>
{
typedef _Tp value_type;
typedef ptrdiff_t difference_type;
};
enum
{
bits_per_byte = 8,
bits_per_block = sizeof(size_t) * size_t(bits_per_byte)
};
template<typename _ForwardIterator, typename _Tp, typename _Compare>
_ForwardIterator
__lower_bound(_ForwardIterator __first, _ForwardIterator __last,
const _Tp& __val, _Compare __comp)
{
typedef typename __mv_iter_traits<_ForwardIterator>::value_type
_ValueType;
typedef typename __mv_iter_traits<_ForwardIterator>::difference_type
_DistanceType;
_DistanceType __len = __last - __first;
_DistanceType __half;
_ForwardIterator __middle;
while (__len > 0)
{
__half = __len >> 1;
__middle = __first;
__middle += __half;
if (__comp(*__middle, __val))
{
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
template<typename _InputIterator, typename _Predicate>
inline _InputIterator
__find_if(_InputIterator __first, _InputIterator __last, _Predicate __p)
{
while (__first != __last && !__p(*__first))
++__first;
return __first;
}
/** @brief The number of Blocks pointed to by the address pair
* passed to the function.
*/
template<typename _AddrPair>
inline size_t
__num_blocks(_AddrPair __ap)
{ return (__ap.second - __ap.first) + 1; }
/** @brief The number of Bit-maps pointed to by the address pair
* passed to the function.
*/
template<typename _AddrPair>
inline size_t
__num_bitmaps(_AddrPair __ap)
{ return __num_blocks(__ap) / size_t(bits_per_block); }
// _Tp should be a pointer type.
template<typename _Tp>
class _Inclusive_between
: public std::unary_function<typename std::pair<_Tp, _Tp>, bool>
{
typedef _Tp pointer;
pointer _M_ptr_value;
typedef typename std::pair<_Tp, _Tp> _Block_pair;
public:
_Inclusive_between(pointer __ptr) : _M_ptr_value(__ptr)
{ }
bool
operator()(_Block_pair __bp) const throw()
{
if (std::less_equal<pointer>()(_M_ptr_value, __bp.second)
&& std::greater_equal<pointer>()(_M_ptr_value, __bp.first))
return true;
else
return false;
}
};
// Used to pass a Functor to functions by reference.
template<typename _Functor>
class _Functor_Ref
: public std::unary_function<typename _Functor::argument_type,
typename _Functor::result_type>
{
_Functor& _M_fref;
public:
typedef typename _Functor::argument_type argument_type;
typedef typename _Functor::result_type result_type;
_Functor_Ref(_Functor& __fref) : _M_fref(__fref)
{ }
result_type
operator()(argument_type __arg)
{ return _M_fref(__arg); }
};
/** @class _Ffit_finder bitmap_allocator.h bitmap_allocator.h
*
* @brief The class which acts as a predicate for applying the
* first-fit memory allocation policy for the bitmap allocator.
*/
// _Tp should be a pointer type, and _Alloc is the Allocator for
// the vector.
template<typename _Tp>
class _Ffit_finder
: public std::unary_function<typename std::pair<_Tp, _Tp>, bool>
{
typedef typename std::pair<_Tp, _Tp> _Block_pair;
typedef typename __detail::__mini_vector<_Block_pair> _BPVector;
typedef typename _BPVector::difference_type _Counter_type;
size_t* _M_pbitmap;
_Counter_type _M_data_offset;
public:
_Ffit_finder() : _M_pbitmap(0), _M_data_offset(0)
{ }
bool
operator()(_Block_pair __bp) throw()
{
// Set the _rover to the last physical location bitmap,
// which is the bitmap which belongs to the first free
// block. Thus, the bitmaps are in exact reverse order of
// the actual memory layout. So, we count down the bitmaps,
// which is the same as moving up the memory.
// If the used count stored at the start of the Bit Map headers
// is equal to the number of Objects that the current Block can
// store, then there is definitely no space for another single
// object, so just return false.
_Counter_type __diff =
__gnu_cxx::__detail::__num_bitmaps(__bp);
if (*(reinterpret_cast<size_t*>
(__bp.first) - (__diff + 1))
== __gnu_cxx::__detail::__num_blocks(__bp))
return false;
size_t* __rover = reinterpret_cast<size_t*>(__bp.first) - 1;
for (_Counter_type __i = 0; __i < __diff; ++__i)
{
_M_data_offset = __i;
if (*__rover)
{
_M_pbitmap = __rover;
return true;
}
--__rover;
}
return false;
}
size_t*
_M_get() const throw()
{ return _M_pbitmap; }
_Counter_type
_M_offset() const throw()
{ return _M_data_offset * size_t(bits_per_block); }
};
/** @class _Bitmap_counter bitmap_allocator.h bitmap_allocator.h
*
* @brief The bitmap counter which acts as the bitmap
* manipulator, and manages the bit-manipulation functions and
* the searching and identification functions on the bit-map.
*/
// _Tp should be a pointer type.
template<typename _Tp>
class _Bitmap_counter
{
typedef typename __detail::__mini_vector<typename std::pair<_Tp, _Tp> >
_BPVector;
typedef typename _BPVector::size_type _Index_type;
typedef _Tp pointer;
_BPVector& _M_vbp;
size_t* _M_curr_bmap;
size_t* _M_last_bmap_in_block;
_Index_type _M_curr_index;
public:
// Use the 2nd parameter with care. Make sure that such an
// entry exists in the vector before passing that particular
// index to this ctor.
_Bitmap_counter(_BPVector& Rvbp, long __index = -1) : _M_vbp(Rvbp)
{ this->_M_reset(__index); }
void
_M_reset(long __index = -1) throw()
{
if (__index == -1)
{
_M_curr_bmap = 0;
_M_curr_index = static_cast<_Index_type>(-1);
return;
}
_M_curr_index = __index;
_M_curr_bmap = reinterpret_cast<size_t*>
(_M_vbp[_M_curr_index].first) - 1;
_GLIBCXX_DEBUG_ASSERT(__index <= (lo°0��±0��²0��³0��´0��µ0��¶0��·0��¸0��¹0��º0��»0��¼0��½0��¾0��¿0��À0��Á0��Â0��Ã0����������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ng)_M_vbp.size() - 1);
_M_last_bmap_in_block = _M_curr_bmap
- ((_M_vbp[_M_curr_index].second
- _M_vbp[_M_curr_index].first + 1)
/ size_t(bits_per_block) - 1);
}
// Dangerous Function! Use with extreme care. Pass to this
// function ONLY those values that are known to be correct,
// otherwise this will mess up big time.
void
_M_set_internal_bitmap(size_t* __new_internal_marker) throw()
{ _M_curr_bmap = __new_internal_marker; }
bool
_M_finished() const throw()
{ return(_M_curr_bmap == 0); }
_Bitmap_counter&
operator++() throw()
{
if (_M_curr_bmap == _M_last_bmap_in_block)
{
if (++_M_curr_index == _M_vbp.size())
_M_curr_bmap = 0;
else
this->_M_reset(_M_curr_index);
}
else
--_M_curr_bmap;
return *this;
}
size_t*
_M_get() const throw()
{ return _M_curr_bmap; }
pointer
_M_base() const throw()
{ return _M_vbp[_M_curr_index].first; }
_Index_type
_M_offset() const throw()
{
return size_t(bits_per_block)
* ((reinterpret_cast<size_t*>(this->_M_base())
- _M_curr_bmap) - 1);
}
_Index_type
_M_where() const throw()
{ return _M_curr_index; }
};
/** @brief Mark a memory address as allocated by re-setting the
* corresponding bit in the bit-map.
*/
inline void
__bit_allocate(size_t* __pbmap, size_t __pos) throw()
{
size_t __mask = 1 << __pos;
__mask = ~__mask;
*__pbmap &= __mask;
}
/** @brief Mark a memory address as free by setting the
* corresponding bit in the bit-map.
*/
inline void
__bit_free(size_t* __pbmap, size_t __pos) throw()
{
size_t __mask = 1 << __pos;
*__pbmap |= __mask;
}
} // namespace __detail
/** @brief Generic Version of the bsf instruction.
*/
inline size_t
_Bit_scan_forward(size_t __num)
{ return static_cast<size_t>(__builtin_ctzl(__num)); }
/** @class free_list bitmap_allocator.h bitmap_allocator.h
*
* @brief The free list class for managing chunks of memory to be
* given to and returned by the bitmap_allocator.
*/
class free_list
{
typedef size_t* value_type;
typedef __detail::__mini_vector<value_type> vector_type;
typedef vector_type::iterator iterator;
typedef __mutex __mutex_type;
struct _LT_pointer_compare
{
bool
operator()(const size_t* __pui,
const size_t __cui) const throw()
{ return *__pui < __cui; }
};
#if defined __GTHREADS
__mutex_type&
_M_get_mutex()
{
static __mutex_type _S_mutex;
return _S_mutex;
}
#endif
vector_type&
_M_get_free_list()
{
static vector_type _S_free_list;
return _S_free_list;
}
/** @brief Performs validation of memory based on their size.
*
* @param __addr The pointer to the memory block to be
* validated.
*
* @detail Validates the memory block passed to this function and
* appropriately performs the action of managing the free list of
* blocks by adding this block to the free list or deleting this
* or larger blocks from the free list.
*/
void
_M_validate(size_t* __addr) throw()
{
vector_type& __free_list = _M_get_free_list();
const vector_type::size_type __max_size = 64;
if (__free_list.size() >= __max_size)
{
// Ok, the threshold value has been reached. We determine
// which block to remove from the list of free blocks.
if (*__addr >= *__free_list.back())
{
// Ok, the new block is greater than or equal to the
// last block in the list of free blocks. We just free
// the new block.
::operator delete(static_cast<void*>(__addr));
return;
}
else
{
// Deallocate the last block in the list of free lists,
// and insert the new one in its correct position.
::operator delete(static_cast<void*>(__free_list.back()));
__free_list.pop_back();
}
}
// Just add the block to the list of free lists unconditionally.
iterator __temp = __gnu_cxx::__detail::__lower_bound
(__free_list.begin(), __free_list.end(),
*__addr, _LT_pointer_compare());
// We may insert the new free list before _temp;
__free_list.insert(__temp, __addr);
}
/** @brief Decides whether the wastage of memory is acceptable for
* the current memory request and returns accordingly.
*
* @param __block_size The size of the block available in the free
* list.
*
* @param __required_size The required size of the memory block.
*
* @return true if the wastage incurred is acceptable, else returns
* false.
*/
bool
_M_should_i_give(size_t __block_size,
size_t __required_size) throw()
{
const size_t __max_wastage_percentage = 36;
if (__block_size >= __required_size &&
(((__block_size - __required_size) * 100 / __block_size)
< __max_wastage_percentage))
return true;
else
return false;
}
public:
/** @brief This function returns the block of memory to the
* internal free list.
*
* @param __addr The pointer to the memory block that was given
* by a call to the _M_get function.
*/
inline void
_M_insert(size_t* __addr) throw()
{
#if defined __GTHREADS
__gnu_cxx::__scoped_lock __bfl_lock(_M_get_mutex());
#endif
// Call _M_validate to decide what should be done with
// this particular free list.
this->_M_validate(reinterpret_cast<size_t*>(__addr) - 1);
// See discussion as to why this is 1!
}
/** @brief This function gets a block of memory of the specified
* size from the free list.
*
* @param __sz The size in bytes of the memory required.
*
* @return A pointer to the new memory block of size at least
* equal to that requested.
*/
size_t*
_M_get(size_t __sz) throw(std::bad_alloc);
/** @brief This function just clears the internal Free List, and
* gives back all the memory to the OS.
*/
void
_M_clear();
};
// Forward declare the class.
template<typename _Tp>
class bitmap_allocator;
// Specialize for void:
template<>
class bitmap_allocator<void>
{
public:
typedef void* pointer;
typedef const void* const_pointer;
// Reference-to-void members are impossible.
typedef void value_type;
template<typename _Tp1>
struct rebind
{
typedef bitmap_allocator<_Tp1> other;
};
};
/// Primary template
template<typename _Tp>
class bitmap_allocator : private free_list
{
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef _Tp* pointer;
typedef const _Tp* const_pointer;
typedef _Tp& reference;
typedef const _Tp& const_reference;
typedef _Tp value_type;
typedef free_list::__mutex_type __mutex_type;
template<typename _Tp1>
struct rebind
{
typedef bitmap_allocator<_Tp1> other;
};
private:
template<size_t _BSize, size_t _AlignSize>
struct aligned_size
{
enum
{
modulus = _BSize % _AlignSize,
value = _BSize + (modulus ? _AlignSize - (modulus) : 0)
};
};
struct _Alloc_block
{
char __M_unused[aligned_size<sizeof(value_type),
_BALLOC_ALIGN_BYTES>::value];
};
typedef typename std::pair<_Alloc_block*, _Alloc_block*> _Block_pair;
typedef typename
__detail::__mini_vector<_Block_pair> _BPVector;
#if defined _GLIBCXX_DEBUG
// Complexity: O(lg(N)). Where, N is the number of block of size
// sizeof(value_type).
void
_S_check_for_free_blocks() throw()
{
typedef typename
__gnu_cxx::__detail::_Ffit_finder<_Alloc_block*> _FFF;
_FFF __fff;
typedef typename _BPVector::iterator _BPiter;
_BPiter __bpi =
__gnu_cxx::__detail::__find_if
(_S_mem_blocks.begin(), _S_mem_blocks.end(),
__gnu_cxx::__detail::_Functor_Ref<_FFF>(__fff));
_GLIBCXX_DEBUG_ASSERT(__bpi == _S_mem_blocks.end());
}
#endif
/** @brief Responsible for exponentially growing the internal
* memory pool.
*
* @throw std::bad_alloc. If memory can not be allocated.
*
* @detail Complexity: O(1), but internally depends upon the
* complexity of the function free_list::_M_get. The part where
* the bitmap headers are written has complexity: O(X),where X
* is the number of blocks of size sizeof(value_type) within
* the newly acquired block. Having a tight bound.
*/
void
_S_refill_pool() throw(std::bad_alloc)
{
#if defined _GLIBCXX_DEBUG
_S_check_for_free_blocks();
#endif
const size_t __num_bitmaps = (_S_block_size
/ size_t(__detail::bits_per_block));
const size_t __size_to_allocate = sizeof(size_t)
+ _S_block_size * sizeof(_Alloc_block)
+ __num_bitmaps * sizeof(size_t);
size_t* __temp =
reinterpret_cast<size_t*>
(this->_M_get(__size_to_allocate));
*__temp = 0;
++__temp;
// The Header information goes at the Beginning of the Block.
_Block_pair __bp =
std::make_pair(reinterpret_cast<_Alloc_block*>
(__temp + __num_bitmaps),
reinterpret_cast<_Alloc_block*>
(__temp + __num_bitmaps)
+ _S_block_size - 1);
// Fill the Vector with this information.
_S_mem_blocks.push_back(__bp);
size_t __bit_mask = 0; // 0 Indicates all Allocated.
__bit_mask = ~__bit_mask; // 1 Indicates all Free.
for (size_t __i = 0; __i < __num_bitmaps; ++__i)
__temp[__i] = __bit_mask;
_S_block_size *= 2;
}
static _BPVector _S_mem_blocks;
static size_t _S_block_size;
static __gnu_cxx::__detail::
_Bitmap_counter<_Alloc_block*> _S_last_request;
static typename _BPVector::size_type _S_last_dealloc_index;
#if defined __GTHREADS
static __mutex_type _S_mut;
#endif
public:
/** @brief Allocates memory for a single object of size
* sizeof(_Tp).
*
* @throw std::bad_alloc. If memory can not be allocated.
*
* @detail Complexity: Worst case complexity is O(N), but that
* is hardly ever hit. If and when this particular case is
* encountered, the next few cases are guaranteed to have a
* worst case complexity of O(1)! That's why this function
* performs very well on average. You can consider this
* function to have a complexity referred to commonly as:
* Amortized Constant time.
*/
pointer
_M_allocate_single_object() throw(std::bad_alloc)
{
#if defined __GTHREADS
__gnu_cxx::__scoped_lock __bit_lock(_S_mut);
#endif
// The algorithm is something like this: The last_request
// variable points to the last accessed Bit Map. When such a
// condition occurs, we try to find a free block in the
// current bitmap, or succeeding bitmaps until the last bitmap
// is reached. If no free block turns up, we resort to First
// Fit method.
// WARNING: Do not re-order the condition in the while
// statement below, because it relies on C++'s short-circuit
// evaluation. The return from _S_last_request->_M_get() will
// NOT be dereference able if _S_last_request->_M_finished()
// returns true. This would inevitably lead to a NULL pointer
// dereference if tinkered with.
while (_S_last_request._M_finished() == false
&& (*(_S_last_request._M_get()) == 0))
{
_S_last_request.operator++();
}
if (__builtin_expect(_S_last_request._M_finished() == true, false))
{
// Fall Back to First Fit algorithm.
typedef typename
__gnu_cxx::__detail::_Ffit_finder<_Alloc_block*> _FFF;
_FFF __fff;
typedef typename _BPVector::iterator _BPiter;
_BPiter __bpi =
__gnu_cxx::__detail::__find_if
(_S_mem_blocks.begin(), _S_mem_blocks.end(),
__gnu_cxx::__detail::_Functor_Ref<_FFF>(__fff));
if (__bpi != _S_mem_blocks.end())
{
// Search was successful. Ok, now mark the first bit from
// the right as 0, meaning Allocated. This bit is obtained
// by calling _M_get() on __fff.
size_t __nz_bit = _Bit_scan_forward(*__fff._M_get());
__detail::__bit_allocate(__fff._M_get(), __nz_bit);
_S_last_request._M_reset(__bpi - _S_mem_blocks.begin());
// Now, get the address of the bit we marked as allocated.
pointer __ret = reinterpret_cast<pointer>
(__bpi->first + __fff._M_offset() + __nz_bit);
size_t* __puse_count =
reinterpret_cast<size_t*>
(__bpi->first)
- (__gnu_cxx::__detail::__num_bitmaps(*__bpi) + 1);
++(*__puse_count);
return __ret;
}
else
{
// Search was unsuccessful. We Add more memory to the
// pool by calling _S_refill_pool().
_S_refill_pool();
// _M_Reset the _S_last_request structure to the first
// free block's bit map.
_S_last_request._M_reset(_S_mem_blocks.size() - 1);
// Now, mark that bit as allocated.
}
}
// _S_last_request holds a pointer to a valid bit map, that
// points to a free block in memory.
size_t __nz_bit = _Bit_scan_forward(*_S_last_request._M_get());
__detail::__bit_allocate(_S_last_request._M_get(), __nz_bit);
pointer __ret = reinterpret_cast<pointer>
(_S_last_request._M_base() + _S_last_request._M_offset() + __nz_bit);
size_t* __puse_count = reinterpret_cast<size_t*>
(_S_mem_blocks[_S_last_request._M_where()].first)
- (__gnu_cxx::__detail::
__num_bitmaps(_S_mem_blocks[_S_last_request._M_where()]) + 1);
++(*__puse_count);
return __ret;
}
/** @brief Deallocates memory that belongs to a single object of
* size sizeof(_Tp).
*
* @detail Complexity: O(lg(N)), but the worst case is not hit
* often! This is because containers usually deallocate memory
* close to each other and this case is handled in O(1) time by
* the deallocate function.
*/
void
_M_deallocate_single_object(pointer __p) throw()
{
#if defined __GTHREADS
__gnu_cxx::__scoped_lock __bit_lock(_S_mut);
#endif
_Alloc_block* __real_p = reinterpret_cast<_Alloc_block*>(__p);
typedef typename _BPVector::iterator _Iterator;
typedef typename _BPVector::difference_type _Difference_type;
_Difference_type __diff;
long __displacement;
_GLIBCXX_DEBUG_ASSERT(_S_last_dealloc_index >= 0);
if (__gnu_cxx::__detail::_Inclusive_between<_Alloc_block*>
(__real_p) (_S_mem_blocks[_S_last_dealloc_index]))
{
_GLIBCXX_DEBUG_ASSERT(_S_last_dealloc_index
<= _S_mem_blocks.size() - 1);
// Initial Assumption was correct!
__diff = _S_last_dealloc_index;
__displacement = __real_p - _S_mem_blocks[__diff].first;
}
else
{
_Iterator _iter = __gnu_cxx::__detail::
__find_if(_S_mem_blocks.begin(),
_S_mem_blocks.end(),
__gnu_cxx::__detail::
_Inclusive_between<_Alloc_block*>(__real_p));
_GLIBCXX_DEBUG_ASSERT(_iter != _S_mem_blocks.end());
__diff = _iter - _S_mem_blocks.begin();
__displacement = __real_p - _S_mem_blocks[__diff].first;
_S_last_dealloc_index = __diff;
}
// Get the position of the iterator that has been found.
const size_t __rotate = (__displacement
% size_t(__detail::bits_per_block));
size_t* __bitmapC =
reinterpret_cast<size_t*>
(_S_mem_blocks[__diff].first) - 1;
__bitmapC -= (__displacement / size_t(__detail::bits_per_block));
__detail::__bit_free(__bitmapC, __rotate);
size_t* __puse_count = reinterpret_cast<size_t*>
(_S_mem_blocks[__diff].first)
- (__gnu_cxx::__detail::__num_bitmaps(_S_mem_blocks[__diff]) + 1);
_GLIBCXX_DEBUG_ASSERT(*__puse_count != 0);
--(*__puse_count);
if (__builtin_expect(*__puse_count == 0, false))
{
_S_block_size /= 2;
// We can safely remove this block.
// _Block_pair __bp = _S_mem_blocks[__diff];
this->_M_insert(__puse_count);
_S_mem_blocks.erase(_S_mem_blocks.begin() + __diff);
// Reset the _S_last_request variable to reflect the
// erased block. We do this to protect future requests
// after the last block has been removed from a particular
// memory Chunk, which in turn has been returned to the
// free list, and hence h