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Diffstat (limited to 'libstdc++-v3/include/std/sstream')
| -rw-r--r-- | libstdc++-v3/include/std/sstream | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/libstdc++-v3/include/std/sstream b/libstdc++-v3/include/std/sstream new file mode 100644 index 00000000000..a09815c1945 --- /dev/null +++ b/libstdc++-v3/include/std/sstream @@ -0,0 +1,591 @@ +// String based streams -*- C++ -*- + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 +// 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 sstream + * This is a Standard C++ Library header. + */ + +// +// ISO C++ 14882: 27.7 String-based streams +// + +#ifndef _GLIBCXX_SSTREAM +#define _GLIBCXX_SSTREAM 1 + +#pragma GCC system_header + +#include <istream> +#include <ostream> + +_GLIBCXX_BEGIN_NAMESPACE(std) + + // [27.7.1] template class basic_stringbuf + /** + * @brief The actual work of input and output (for std::string). + * + * This class associates either or both of its input and output sequences + * with a sequence of characters, which can be initialized from, or made + * available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.) + * + * For this class, open modes (of type @c ios_base::openmode) have + * @c in set if the input sequence can be read, and @c out set if the + * output sequence can be written. + */ + template<typename _CharT, typename _Traits, typename _Alloc> + class basic_stringbuf : public basic_streambuf<_CharT, _Traits> + { + public: + // Types: + typedef _CharT char_type; + typedef _Traits traits_type; + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 251. basic_stringbuf missing allocator_type + typedef _Alloc allocator_type; + typedef typename traits_type::int_type int_type; + typedef typename traits_type::pos_type pos_type; + typedef typename traits_type::off_type off_type; + + typedef basic_streambuf<char_type, traits_type> __streambuf_type; + typedef basic_string<char_type, _Traits, _Alloc> __string_type; + typedef typename __string_type::size_type __size_type; + + protected: + /** + * @if maint + * Place to stash in || out || in | out settings for current stringbuf. + * @endif + */ + ios_base::openmode _M_mode; + + // Data Members: + __string_type _M_string; + + public: + // Constructors: + /** + * @brief Starts with an empty string buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * The default constructor initializes the parent class using its + * own default ctor. + */ + explicit + basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out) + : __streambuf_type(), _M_mode(__mode), _M_string() + { } + + /** + * @brief Starts with an existing string buffer. + * @param str A string to copy as a starting buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * This constructor initializes the parent class using its + * own default ctor. + */ + explicit + basic_stringbuf(const __string_type& __str, + ios_base::openmode __mode = ios_base::in | ios_base::out) + : __streambuf_type(), _M_mode(), _M_string(__str.data(), __str.size()) + { _M_stringbuf_init(__mode); } + + // Get and set: + /** + * @brief Copying out the string buffer. + * @return A copy of one of the underlying sequences. + * + * "If the buffer is only created in input mode, the underlying + * character sequence is equal to the input sequence; otherwise, it + * is equal to the output sequence." [27.7.1.2]/1 + */ + __string_type + str() const + { + __string_type __ret; + if (this->pptr()) + { + // The current egptr() may not be the actual string end. + if (this->pptr() > this->egptr()) + __ret = __string_type(this->pbase(), this->pptr()); + else + __ret = __string_type(this->pbase(), this->egptr()); + } + else + __ret = _M_string; + return __ret; + } + + /** + * @brief Setting a new buffer. + * @param s The string to use as a new sequence. + * + * Deallocates any previous stored sequence, then copies @a s to + * use as a new one. + */ + void + str(const __string_type& __s) + { + // Cannot use _M_string = __s, since v3 strings are COW. + _M_string.assign(__s.data(), __s.size()); + _M_stringbuf_init(_M_mode); + } + + protected: + // Common initialization code goes here. + void + _M_stringbuf_init(ios_base::openmode __mode) + { + _M_mode = __mode; + __size_type __len = 0; + if (_M_mode & (ios_base::ate | ios_base::app)) + __len = _M_string.size(); + _M_sync(const_cast<char_type*>(_M_string.data()), 0, __len); + } + + virtual streamsize + showmanyc() + { + streamsize __ret = -1; + if (_M_mode & ios_base::in) + { + _M_update_egptr(); + __ret = this->egptr() - this->gptr(); + } + return __ret; + } + + virtual int_type + underflow(); + + virtual int_type + pbackfail(int_type __c = traits_type::eof()); + + virtual int_type + overflow(int_type __c = traits_type::eof()); + + /** + * @brief Manipulates the buffer. + * @param s Pointer to a buffer area. + * @param n Size of @a s. + * @return @c this + * + * If no buffer has already been created, and both @a s and @a n are + * non-zero, then @c s is used as a buffer; see + * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 + * for more. + */ + virtual __streambuf_type* + setbuf(char_type* __s, streamsize __n) + { + if (__s && __n >= 0) + { + // This is implementation-defined behavior, and assumes + // that an external char_type array of length __n exists + // and has been pre-allocated. If this is not the case, + // things will quickly blow up. + + // Step 1: Destroy the current internal array. + _M_string.clear(); + + // Step 2: Use the external array. + _M_sync(__s, __n, 0); + } + return this; + } + + virtual pos_type + seekoff(off_type __off, ios_base::seekdir __way, + ios_base::openmode __mode = ios_base::in | ios_base::out); + + virtual pos_type + seekpos(pos_type __sp, + ios_base::openmode __mode = ios_base::in | ios_base::out); + + // Internal function for correctly updating the internal buffer + // for a particular _M_string, due to initialization or re-sizing + // of an existing _M_string. + void + _M_sync(char_type* __base, __size_type __i, __size_type __o); + + // Internal function for correctly updating egptr() to the actual + // string end. + void + _M_update_egptr() + { + const bool __testin = _M_mode & ios_base::in; + if (this->pptr() && this->pptr() > this->egptr()) + if (__testin) + this->setg(this->eback(), this->gptr(), this->pptr()); + else + this->setg(this->pptr(), this->pptr(), this->pptr()); + } + }; + + + // [27.7.2] Template class basic_istringstream + /** + * @brief Controlling input for std::string. + * + * This class supports reading from objects of type std::basic_string, + * using the inherited functions from std::basic_istream. To control + * the associated sequence, an instance of std::basic_stringbuf is used, + * which this page refers to as @c sb. + */ + template<typename _CharT, typename _Traits, typename _Alloc> + class basic_istringstream : public basic_istream<_CharT, _Traits> + { + public: + // Types: + typedef _CharT char_type; + typedef _Traits traits_type; + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 251. basic_stringbuf missing allocator_type + typedef _Alloc allocator_type; + typedef typename traits_type::int_type int_type; + typedef typename traits_type::pos_type pos_type; + typedef typename traits_type::off_type off_type; + + // Non-standard types: + typedef basic_string<_CharT, _Traits, _Alloc> __string_type; + typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; + typedef basic_istream<char_type, traits_type> __istream_type; + + private: + __stringbuf_type _M_stringbuf; + + public: + // Constructors: + /** + * @brief Default constructor starts with an empty string buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * @c ios_base::in is automatically included in @a mode. + * + * Initializes @c sb using @c mode|in, and passes @c &sb to the base + * class initializer. Does not allocate any buffer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_istringstream(ios_base::openmode __mode = ios_base::in) + : __istream_type(), _M_stringbuf(__mode | ios_base::in) + { this->init(&_M_stringbuf); } + + /** + * @brief Starts with an existing string buffer. + * @param str A string to copy as a starting buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * @c ios_base::in is automatically included in @a mode. + * + * Initializes @c sb using @a str and @c mode|in, and passes @c &sb + * to the base class initializer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_istringstream(const __string_type& __str, + ios_base::openmode __mode = ios_base::in) + : __istream_type(), _M_stringbuf(__str, __mode | ios_base::in) + { this->init(&_M_stringbuf); } + + /** + * @brief The destructor does nothing. + * + * The buffer is deallocated by the stringbuf object, not the + * formatting stream. + */ + ~basic_istringstream() + { } + + // Members: + /** + * @brief Accessing the underlying buffer. + * @return The current basic_stringbuf buffer. + * + * This hides both signatures of std::basic_ios::rdbuf(). + */ + __stringbuf_type* + rdbuf() const + { return const_cast<__stringbuf_type*>(&_M_stringbuf); } + + /** + * @brief Copying out the string buffer. + * @return @c rdbuf()->str() + */ + __string_type + str() const + { return _M_stringbuf.str(); } + + /** + * @brief Setting a new buffer. + * @param s The string to use as a new sequence. + * + * Calls @c rdbuf()->str(s). + */ + void + str(const __string_type& __s) + { _M_stringbuf.str(__s); } + }; + + + // [27.7.3] Template class basic_ostringstream + /** + * @brief Controlling output for std::string. + * + * This class supports writing to objects of type std::basic_string, + * using the inherited functions from std::basic_ostream. To control + * the associated sequence, an instance of std::basic_stringbuf is used, + * which this page refers to as @c sb. + */ + template <typename _CharT, typename _Traits, typename _Alloc> + class basic_ostringstream : public basic_ostream<_CharT, _Traits> + { + public: + // Types: + typedef _CharT char_type; + typedef _Traits traits_type; + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 251. basic_stringbuf missing allocator_type + typedef _Alloc allocator_type; + typedef typename traits_type::int_type int_type; + typedef typename traits_type::pos_type pos_type; + typedef typename traits_type::off_type off_type; + + // Non-standard types: + typedef basic_string<_CharT, _Traits, _Alloc> __string_type; + typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; + typedef basic_ostream<char_type, traits_type> __ostream_type; + + private: + __stringbuf_type _M_stringbuf; + + public: + // Constructors/destructor: + /** + * @brief Default constructor starts with an empty string buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * @c ios_base::out is automatically included in @a mode. + * + * Initializes @c sb using @c mode|out, and passes @c &sb to the base + * class initializer. Does not allocate any buffer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_ostringstream(ios_base::openmode __mode = ios_base::out) + : __ostream_type(), _M_stringbuf(__mode | ios_base::out) + { this->init(&_M_stringbuf); } + + /** + * @brief Starts with an existing string buffer. + * @param str A string to copy as a starting buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * @c ios_base::out is automatically included in @a mode. + * + * Initializes @c sb using @a str and @c mode|out, and passes @c &sb + * to the base class initializer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_ostringstream(const __string_type& __str, + ios_base::openmode __mode = ios_base::out) + : __ostream_type(), _M_stringbuf(__str, __mode | ios_base::out) + { this->init(&_M_stringbuf); } + + /** + * @brief The destructor does nothing. + * + * The buffer is deallocated by the stringbuf object, not the + * formatting stream. + */ + ~basic_ostringstream() + { } + + // Members: + /** + * @brief Accessing the underlying buffer. + * @return The current basic_stringbuf buffer. + * + * This hides both signatures of std::basic_ios::rdbuf(). + */ + __stringbuf_type* + rdbuf() const + { return const_cast<__stringbuf_type*>(&_M_stringbuf); } + + /** + * @brief Copying out the string buffer. + * @return @c rdbuf()->str() + */ + __string_type + str() const + { return _M_stringbuf.str(); } + + /** + * @brief Setting a new buffer. + * @param s The string to use as a new sequence. + * + * Calls @c rdbuf()->str(s). + */ + void + str(const __string_type& __s) + { _M_stringbuf.str(__s); } + }; + + + // [27.7.4] Template class basic_stringstream + /** + * @brief Controlling input and output for std::string. + * + * This class supports reading from and writing to objects of type + * std::basic_string, using the inherited functions from + * std::basic_iostream. To control the associated sequence, an instance + * of std::basic_stringbuf is used, which this page refers to as @c sb. + */ + template <typename _CharT, typename _Traits, typename _Alloc> + class basic_stringstream : public basic_iostream<_CharT, _Traits> + { + public: + // Types: + typedef _CharT char_type; + typedef _Traits traits_type; + // _GLIBCXX_RESOLVE_LIB_DEFECTS + // 251. basic_stringbuf missing allocator_type + typedef _Alloc allocator_type; + typedef typename traits_type::int_type int_type; + typedef typename traits_type::pos_type pos_type; + typedef typename traits_type::off_type off_type; + + // Non-standard Types: + typedef basic_string<_CharT, _Traits, _Alloc> __string_type; + typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type; + typedef basic_iostream<char_type, traits_type> __iostream_type; + + private: + __stringbuf_type _M_stringbuf; + + public: + // Constructors/destructors + /** + * @brief Default constructor starts with an empty string buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * Initializes @c sb using @c mode, and passes @c &sb to the base + * class initializer. Does not allocate any buffer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in) + : __iostream_type(), _M_stringbuf(__m) + { this->init(&_M_stringbuf); } + + /** + * @brief Starts with an existing string buffer. + * @param str A string to copy as a starting buffer. + * @param mode Whether the buffer can read, or write, or both. + * + * Initializes @c sb using @a str and @c mode, and passes @c &sb + * to the base class initializer. + * + * @if maint + * That's a lie. We initialize the base class with NULL, because the + * string class does its own memory management. + * @endif + */ + explicit + basic_stringstream(const __string_type& __str, + ios_base::openmode __m = ios_base::out | ios_base::in) + : __iostream_type(), _M_stringbuf(__str, __m) + { this->init(&_M_stringbuf); } + + /** + * @brief The destructor does nothing. + * + * The buffer is deallocated by the stringbuf object, not the + * formatting stream. + */ + ~basic_stringstream() + { } + + // Members: + /** + * @brief Accessing the underlying buffer. + * @return The current basic_stringbuf buffer. + * + * This hides both signatures of std::basic_ios::rdbuf(). + */ + __stringbuf_type* + rdbuf() const + { return const_cast<__stringbuf_type*>(&_M_stringbuf); } + + /** + * @brief Copying out the string buffer. + * @return @c rdbuf()->str() + */ + __string_type + str() const + { return _M_stringbuf.str(); } + + /** + * @brief Setting a new buffer. + * @param s The string to use as a new sequence. + * + * Calls @c rdbuf()->str(s). + */ + void + str(const __string_type& __s) + { _M_stringbuf.str(__s); } + }; + +_GLIBCXX_END_NAMESPACE + +#ifndef _GLIBCXX_EXPORT_TEMPLATE +# include <bits/sstream.tcc> +#endif + +#endif /* _GLIBCXX_SSTREAM */ |
