| // String based streams -*- C++ -*- |
| |
| // Copyright (C) 1997-2020 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 3, 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. |
| |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| /** @file include/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> |
| |
| namespace std _GLIBCXX_VISIBILITY(default) |
| { |
| _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| _GLIBCXX_BEGIN_NAMESPACE_CXX11 |
| |
| // [27.7.1] template class basic_stringbuf |
| /** |
| * @brief The actual work of input and output (for std::string). |
| * @ingroup io |
| * |
| * @tparam _CharT Type of character stream. |
| * @tparam _Traits Traits for character type, defaults to |
| * char_traits<_CharT>. |
| * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. |
| * |
| * 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> |
| { |
| struct __xfer_bufptrs; |
| 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: |
| /// Place to stash in || out || in | out settings for current stringbuf. |
| ios_base::openmode _M_mode; |
| |
| // Data Members: |
| __string_type _M_string; |
| |
| public: |
| // Constructors: |
| |
| /** |
| * @brief Starts with an empty string buffer. |
| * |
| * The default constructor initializes the parent class using its |
| * own default ctor. |
| */ |
| basic_stringbuf() |
| : __streambuf_type(), _M_mode(ios_base::in | ios_base::out), _M_string() |
| { } |
| |
| /** |
| * @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) |
| : __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(), __str.get_allocator()) |
| { _M_stringbuf_init(__mode); } |
| |
| #if __cplusplus >= 201103L |
| basic_stringbuf(const basic_stringbuf&) = delete; |
| |
| basic_stringbuf(basic_stringbuf&& __rhs) |
| : basic_stringbuf(std::move(__rhs), __xfer_bufptrs(__rhs, this)) |
| { __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); } |
| |
| // 27.8.2.2 Assign and swap: |
| |
| basic_stringbuf& |
| operator=(const basic_stringbuf&) = delete; |
| |
| basic_stringbuf& |
| operator=(basic_stringbuf&& __rhs) |
| { |
| __xfer_bufptrs __st{__rhs, this}; |
| const __streambuf_type& __base = __rhs; |
| __streambuf_type::operator=(__base); |
| this->pubimbue(__rhs.getloc()); |
| _M_mode = __rhs._M_mode; |
| _M_string = std::move(__rhs._M_string); |
| __rhs._M_sync(const_cast<char_type*>(__rhs._M_string.data()), 0, 0); |
| return *this; |
| } |
| |
| void |
| swap(basic_stringbuf& __rhs) |
| { |
| __xfer_bufptrs __l_st{*this, std::__addressof(__rhs)}; |
| __xfer_bufptrs __r_st{__rhs, this}; |
| __streambuf_type& __base = __rhs; |
| __streambuf_type::swap(__base); |
| __rhs.pubimbue(this->pubimbue(__rhs.getloc())); |
| std::swap(_M_mode, __rhs._M_mode); |
| std::swap(_M_string, __rhs._M_string); |
| } |
| #endif |
| |
| // Get and set: |
| /** |
| * @brief Copying out the string buffer. |
| * @return A copy of one of the underlying sequences. |
| * |
| * <em>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.</em> [27.7.1.2]/1 |
| */ |
| __string_type |
| str() const |
| { |
| __string_type __ret(_M_string.get_allocator()); |
| if (this->pptr()) |
| { |
| // The current egptr() may not be the actual string end. |
| if (this->pptr() > this->egptr()) |
| __ret.assign(this->pbase(), this->pptr()); |
| else |
| __ret.assign(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 |
| // (not always true now but assign() always works). |
| _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 |
| * https://gcc.gnu.org/onlinedocs/libstdc++/manual/streambufs.html#io.streambuf.buffering |
| * 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()); |
| } |
| } |
| |
| // Works around the issue with pbump, part of the protected |
| // interface of basic_streambuf, taking just an int. |
| void |
| _M_pbump(char_type* __pbeg, char_type* __pend, off_type __off); |
| |
| private: |
| #if __cplusplus >= 201103L |
| #if _GLIBCXX_USE_CXX11_ABI |
| // This type captures the state of the gptr / pptr pointers as offsets |
| // so they can be restored in another object after moving the string. |
| struct __xfer_bufptrs |
| { |
| __xfer_bufptrs(const basic_stringbuf& __from, basic_stringbuf* __to) |
| : _M_to{__to}, _M_goff{-1, -1, -1}, _M_poff{-1, -1, -1} |
| { |
| const _CharT* const __str = __from._M_string.data(); |
| const _CharT* __end = nullptr; |
| if (__from.eback()) |
| { |
| _M_goff[0] = __from.eback() - __str; |
| _M_goff[1] = __from.gptr() - __str; |
| _M_goff[2] = __from.egptr() - __str; |
| __end = __from.egptr(); |
| } |
| if (__from.pbase()) |
| { |
| _M_poff[0] = __from.pbase() - __str; |
| _M_poff[1] = __from.pptr() - __from.pbase(); |
| _M_poff[2] = __from.epptr() - __str; |
| if (__from.pptr() > __end) |
| __end = __from.pptr(); |
| } |
| |
| // Set _M_string length to the greater of the get and put areas. |
| if (__end) |
| { |
| // The const_cast avoids changing this constructor's signature, |
| // because it is exported from the dynamic library. |
| auto& __mut_from = const_cast<basic_stringbuf&>(__from); |
| __mut_from._M_string._M_length(__end - __str); |
| } |
| } |
| |
| ~__xfer_bufptrs() |
| { |
| char_type* __str = const_cast<char_type*>(_M_to->_M_string.data()); |
| if (_M_goff[0] != -1) |
| _M_to->setg(__str+_M_goff[0], __str+_M_goff[1], __str+_M_goff[2]); |
| if (_M_poff[0] != -1) |
| _M_to->_M_pbump(__str+_M_poff[0], __str+_M_poff[2], _M_poff[1]); |
| } |
| |
| basic_stringbuf* _M_to; |
| off_type _M_goff[3]; |
| off_type _M_poff[3]; |
| }; |
| #else |
| // This type does nothing when using Copy-On-Write strings. |
| struct __xfer_bufptrs |
| { |
| __xfer_bufptrs(const basic_stringbuf&, basic_stringbuf*) { } |
| }; |
| #endif |
| |
| // The move constructor initializes an __xfer_bufptrs temporary then |
| // delegates to this constructor to performs moves during its lifetime. |
| basic_stringbuf(basic_stringbuf&& __rhs, __xfer_bufptrs&&) |
| : __streambuf_type(static_cast<const __streambuf_type&>(__rhs)), |
| _M_mode(__rhs._M_mode), _M_string(std::move(__rhs._M_string)) |
| { } |
| #endif |
| }; |
| |
| |
| // [27.7.2] Template class basic_istringstream |
| /** |
| * @brief Controlling input for std::string. |
| * @ingroup io |
| * |
| * @tparam _CharT Type of character stream. |
| * @tparam _Traits Traits for character type, defaults to |
| * char_traits<_CharT>. |
| * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. |
| * |
| * 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. |
| * |
| * Initializes @c sb using @c in, and passes @c &sb to the base |
| * class initializer. Does not allocate any buffer. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| basic_istringstream() |
| : __istream_type(), _M_stringbuf(ios_base::in) |
| { this->init(&_M_stringbuf); } |
| |
| /** |
| * @brief 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. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| explicit |
| basic_istringstream(ios_base::openmode __mode) |
| : __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. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| 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() |
| { } |
| |
| #if __cplusplus >= 201103L |
| basic_istringstream(const basic_istringstream&) = delete; |
| |
| basic_istringstream(basic_istringstream&& __rhs) |
| : __istream_type(std::move(__rhs)), |
| _M_stringbuf(std::move(__rhs._M_stringbuf)) |
| { __istream_type::set_rdbuf(&_M_stringbuf); } |
| |
| // 27.8.3.2 Assign and swap: |
| |
| basic_istringstream& |
| operator=(const basic_istringstream&) = delete; |
| |
| basic_istringstream& |
| operator=(basic_istringstream&& __rhs) |
| { |
| __istream_type::operator=(std::move(__rhs)); |
| _M_stringbuf = std::move(__rhs._M_stringbuf); |
| return *this; |
| } |
| |
| void |
| swap(basic_istringstream& __rhs) |
| { |
| __istream_type::swap(__rhs); |
| _M_stringbuf.swap(__rhs._M_stringbuf); |
| } |
| #endif |
| |
| // 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. |
| * @ingroup io |
| * |
| * @tparam _CharT Type of character stream. |
| * @tparam _Traits Traits for character type, defaults to |
| * char_traits<_CharT>. |
| * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. |
| * |
| * 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. |
| * |
| * Initializes @c sb using @c mode|out, and passes @c &sb to the base |
| * class initializer. Does not allocate any buffer. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| basic_ostringstream() |
| : __ostream_type(), _M_stringbuf(ios_base::out) |
| { this->init(&_M_stringbuf); } |
| |
| /** |
| * @brief 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. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| explicit |
| basic_ostringstream(ios_base::openmode __mode) |
| : __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. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| 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() |
| { } |
| |
| #if __cplusplus >= 201103L |
| basic_ostringstream(const basic_ostringstream&) = delete; |
| |
| basic_ostringstream(basic_ostringstream&& __rhs) |
| : __ostream_type(std::move(__rhs)), |
| _M_stringbuf(std::move(__rhs._M_stringbuf)) |
| { __ostream_type::set_rdbuf(&_M_stringbuf); } |
| |
| // 27.8.3.2 Assign and swap: |
| |
| basic_ostringstream& |
| operator=(const basic_ostringstream&) = delete; |
| |
| basic_ostringstream& |
| operator=(basic_ostringstream&& __rhs) |
| { |
| __ostream_type::operator=(std::move(__rhs)); |
| _M_stringbuf = std::move(__rhs._M_stringbuf); |
| return *this; |
| } |
| |
| void |
| swap(basic_ostringstream& __rhs) |
| { |
| __ostream_type::swap(__rhs); |
| _M_stringbuf.swap(__rhs._M_stringbuf); |
| } |
| #endif |
| |
| // 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. |
| * @ingroup io |
| * |
| * @tparam _CharT Type of character stream. |
| * @tparam _Traits Traits for character type, defaults to |
| * char_traits<_CharT>. |
| * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. |
| * |
| * 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. |
| * |
| * Initializes @c sb using the mode @c in|out, and passes @c &sb |
| * to the base class initializer. Does not allocate any buffer. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| basic_stringstream() |
| : __iostream_type(), _M_stringbuf(ios_base::out | ios_base::in) |
| { this->init(&_M_stringbuf); } |
| |
| /** |
| * @brief Starts with an empty string buffer. |
| * @param __m Whether the buffer can read, or write, or both. |
| * |
| * Initializes @c sb using the mode from @c __m, and passes @c &sb |
| * to the base class initializer. Does not allocate any buffer. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| explicit |
| basic_stringstream(ios_base::openmode __m) |
| : __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 __m Whether the buffer can read, or write, or both. |
| * |
| * Initializes @c sb using @a __str and @c __m, and passes @c &sb |
| * to the base class initializer. |
| * |
| * That's a lie. We initialize the base class with NULL, because the |
| * string class does its own memory management. |
| */ |
| 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() |
| { } |
| |
| #if __cplusplus >= 201103L |
| basic_stringstream(const basic_stringstream&) = delete; |
| |
| basic_stringstream(basic_stringstream&& __rhs) |
| : __iostream_type(std::move(__rhs)), |
| _M_stringbuf(std::move(__rhs._M_stringbuf)) |
| { __iostream_type::set_rdbuf(&_M_stringbuf); } |
| |
| // 27.8.3.2 Assign and swap: |
| |
| basic_stringstream& |
| operator=(const basic_stringstream&) = delete; |
| |
| basic_stringstream& |
| operator=(basic_stringstream&& __rhs) |
| { |
| __iostream_type::operator=(std::move(__rhs)); |
| _M_stringbuf = std::move(__rhs._M_stringbuf); |
| return *this; |
| } |
| |
| void |
| swap(basic_stringstream& __rhs) |
| { |
| __iostream_type::swap(__rhs); |
| _M_stringbuf.swap(__rhs._M_stringbuf); |
| } |
| #endif |
| |
| // 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); } |
| }; |
| |
| #if __cplusplus >= 201103L |
| /// Swap specialization for stringbufs. |
| template <class _CharT, class _Traits, class _Allocator> |
| inline void |
| swap(basic_stringbuf<_CharT, _Traits, _Allocator>& __x, |
| basic_stringbuf<_CharT, _Traits, _Allocator>& __y) |
| { __x.swap(__y); } |
| |
| /// Swap specialization for istringstreams. |
| template <class _CharT, class _Traits, class _Allocator> |
| inline void |
| swap(basic_istringstream<_CharT, _Traits, _Allocator>& __x, |
| basic_istringstream<_CharT, _Traits, _Allocator>& __y) |
| { __x.swap(__y); } |
| |
| /// Swap specialization for ostringstreams. |
| template <class _CharT, class _Traits, class _Allocator> |
| inline void |
| swap(basic_ostringstream<_CharT, _Traits, _Allocator>& __x, |
| basic_ostringstream<_CharT, _Traits, _Allocator>& __y) |
| { __x.swap(__y); } |
| |
| /// Swap specialization for stringstreams. |
| template <class _CharT, class _Traits, class _Allocator> |
| inline void |
| swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x, |
| basic_stringstream<_CharT, _Traits, _Allocator>& __y) |
| { __x.swap(__y); } |
| #endif |
| |
| _GLIBCXX_END_NAMESPACE_CXX11 |
| _GLIBCXX_END_NAMESPACE_VERSION |
| } // namespace |
| |
| #include <bits/sstream.tcc> |
| |
| #endif /* _GLIBCXX_SSTREAM */ |
