author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 03 May 2010 14:06:43 +0300 | |
changeset 22 | ddc455616bd6 |
parent 0 | e4d67989cc36 |
child 45 | 4b03adbd26ca |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999 |
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* Silicon Graphics Computer Systems, Inc. |
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* |
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* Copyright (c) 1999 |
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* Boris Fomitchev |
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* |
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* This material is provided "as is", with absolutely no warranty expressed |
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* or implied. Any use is at your own risk. |
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* |
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* Permission to use or copy this software for any purpose is hereby granted |
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* without fee, provided the above notices are retained on all copies. |
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* Permission to modify the code and to distribute modified code is granted, |
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* provided the above notices are retained, and a notice that the code was |
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* modified is included with the above copyright notice. |
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* |
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*/ |
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#ifndef _STLP_INTERNAL_STREAMBUF |
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#define _STLP_INTERNAL_STREAMBUF |
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#ifndef _STLP_IOS_BASE_H |
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# include <stl/_ios_base.h> // Needed for ios_base bitfield members. |
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#endif // <ios_base> includes <iosfwd>. |
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_STLP_BEGIN_NAMESPACE |
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//---------------------------------------------------------------------- |
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// Class basic_streambuf<>, the base class of the streambuf hierarchy. |
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// A basic_streambuf<> manages an input (get) area and an output (put) |
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// area. Each is described by three pointers: a beginning, an end, and a |
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// current position. basic_streambuf<> contains some very simple member |
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// functions that manipulate those six pointers, but almost all of the real |
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// functionality gets delegated to protected virtual member functions. |
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// All of the public member functions are inline, and most of the protected |
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// member functions are virtual. |
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// Although basic_streambuf<> is not abstract, it is useful only as a base |
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// class. Its virtual member functions have default definitions such that |
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// reading from a basic_streambuf<> will always yield EOF, and writing to a |
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// basic_streambuf<> will always fail. |
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// The second template parameter, _Traits, defaults to char_traits<_CharT>. |
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// The default is declared in header <iosfwd>, and it isn't declared here |
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// because C++ language rules do not allow it to be declared twice. |
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template <class _CharT, class _Traits> |
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class basic_streambuf { |
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friend class basic_istream<_CharT, _Traits>; |
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friend class basic_ostream<_CharT, _Traits>; |
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public: // Typedefs. |
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typedef _CharT char_type; |
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typedef typename _Traits::int_type int_type; |
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typedef typename _Traits::pos_type pos_type; |
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typedef typename _Traits::off_type off_type; |
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typedef _Traits traits_type; |
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private: // Data members. |
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char_type* _M_gbegin; // Beginning of get area |
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char_type* _M_gnext; // Current position within the get area |
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char_type* _M_gend; // End of get area |
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char_type* _M_pbegin; // Beginning of put area |
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char_type* _M_pnext; // Current position within the put area |
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char_type* _M_pend; // End of put area |
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locale _M_locale; // The streambuf's locale object |
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//public: // Extension: locking, for thread safety. |
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// _STLP_mutex _M_lock; |
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public: // Destructor. |
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virtual ~basic_streambuf(){} |
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protected: // The default constructor. |
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basic_streambuf() |
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#if defined (_STLP_MSVC) && (_STLP_MSVC < 1300) && defined (_STLP_USE_STATIC_LIB) |
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//We make it inline to avoid unresolved symbol. |
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: _M_gbegin(0), _M_gnext(0), _M_gend(0), |
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_M_pbegin(0), _M_pnext(0), _M_pend(0), |
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_M_locale() |
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{} |
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#else |
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; |
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#endif |
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protected: // Protected interface to the get area. |
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char_type* eback() const { return _M_gbegin; } // Beginning |
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char_type* gptr() const { return _M_gnext; } // Current position |
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char_type* egptr() const { return _M_gend; } // End |
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void gbump(int __n) { _M_gnext += __n; } |
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void setg(char_type* __gbegin, char_type* __gnext, char_type* __gend) { |
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_M_gbegin = __gbegin; |
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_M_gnext = __gnext; |
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_M_gend = __gend; |
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} |
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public: |
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// An alternate public interface to the above functions |
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// which allows us to avoid using templated friends which |
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// are not supported on some compilers. |
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char_type* _M_eback() const { return eback(); } |
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char_type* _M_gptr() const { return gptr(); } |
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char_type* _M_egptr() const { return egptr(); } |
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void _M_gbump(int __n) { gbump(__n); } |
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void _M_setg(char_type* __gbegin, char_type* __gnext, char_type* __gend) |
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{ this->setg(__gbegin, __gnext, __gend); } |
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111 |
|
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protected: // Protected interface to the put area |
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113 |
|
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char_type* pbase() const { return _M_pbegin; } // Beginning |
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char_type* pptr() const { return _M_pnext; } // Current position |
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char_type* epptr() const { return _M_pend; } // End |
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117 |
|
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void pbump(int __n) { _M_pnext += __n; } |
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void setp(char_type* __pbegin, char_type* __pend) { |
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_M_pbegin = __pbegin; |
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_M_pnext = __pbegin; |
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_M_pend = __pend; |
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} |
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124 |
|
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protected: // Virtual buffer management functions. |
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126 |
|
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127 |
|
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128 |
|
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virtual basic_streambuf<_CharT, _Traits>* setbuf(char_type*, streamsize) { |
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return this; |
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} |
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132 |
|
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// Alters the stream position, using an integer offset. In this |
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// class seekoff does nothing; subclasses are expected to override it. |
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135 |
|
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virtual pos_type seekoff(off_type, ios_base::seekdir, |
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ios_base::openmode = ios_base::in | ios_base::out) { |
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return pos_type(-1); |
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} |
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140 |
|
0
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// Alters the stream position, using a previously obtained streampos. In |
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// this class seekpos does nothing; subclasses are expected to override it. |
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virtual pos_type |
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seekpos(pos_type, ios_base::openmode = ios_base::in | ios_base::out) { |
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return pos_type(-1); |
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} |
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|
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// Synchronizes (i.e. flushes) the buffer. All subclasses are expected to |
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// override this virtual member function. |
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virtual int sync() { |
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return 0; |
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} |
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153 |
|
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public: // Buffer management. |
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basic_streambuf<_CharT, _Traits>* pubsetbuf(char_type* __s, streamsize __n) |
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{ return this->setbuf(__s, __n); } |
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157 |
|
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pos_type pubseekoff(off_type __offset, ios_base::seekdir __way, |
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ios_base::openmode __mod = ios_base::in | ios_base::out) |
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{ return this->seekoff(__offset, __way, __mod); } |
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161 |
|
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pos_type pubseekpos(pos_type __sp, |
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ios_base::openmode __mod = ios_base::in | ios_base::out) |
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{ return this->seekpos(__sp, __mod); } |
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165 |
|
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int pubsync() { return this->sync(); } |
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167 |
|
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protected: // Virtual get area functions, as defined in |
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// 17.5.2.4.3 and 17.5.2.4.4 of the standard. |
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// Returns a lower bound on the number of characters that we can read, |
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// with underflow, before reaching end of file. (-1 is a special value: |
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// it means that underflow will fail.) Most subclasses should probably |
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// override this virtual member function. |
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174 |
|
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virtual streamsize showmanyc() { |
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return 0; |
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} |
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|
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// Reads up to __n characters. Return value is the number of |
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// characters read. |
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virtual streamsize xsgetn(char_type* __s, streamsize __n) { |
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streamsize __result = 0; |
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const int_type __eof = _Traits::eof(); |
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184 |
|
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while (__result < __n) { |
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if (_M_gnext < _M_gend) { |
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size_t __chunk = (min) (__STATIC_CAST(size_t,_M_gend - _M_gnext), |
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__STATIC_CAST(size_t,__n - __result)); |
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_Traits::copy(__s, _M_gnext, __chunk); |
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__result += __chunk; |
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__s += __chunk; |
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_M_gnext += __chunk; |
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} |
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else { |
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int_type __c = this->sbumpc(); |
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if (!_Traits::eq_int_type(__c, __eof)) { |
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*__s = _Traits::to_char_type(__c); |
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++__result; |
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++__s; |
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} |
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else |
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break; |
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} |
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} |
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205 |
|
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return __result; |
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} |
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|
0
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// Called when there is no read position, i.e. when gptr() is null |
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// or when gptr() >= egptr(). Subclasses are expected to override |
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// this virtual member function. |
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virtual int_type underflow() { |
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return _Traits::eof(); |
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} |
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|
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// Similar to underflow(), but used for unbuffered input. Most |
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// subclasses should probably override this virtual member function. |
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virtual int_type uflow() { |
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return ( _Traits::eq_int_type(this->underflow(),_Traits::eof()) ? |
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_Traits::eof() : |
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_Traits::to_int_type(*_M_gnext++)); |
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} |
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223 |
|
0
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// Called when there is no putback position, i.e. when gptr() is null |
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// or when gptr() == eback(). All subclasses are expected to override |
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// this virtual member function. |
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virtual int_type pbackfail(int_type = traits_type::eof()) { |
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return _Traits::eof(); |
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} |
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230 |
|
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231 |
|
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protected: // Virtual put area functions, as defined in |
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// 27.5.2.4.5 of the standard. |
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234 |
|
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// Writes up to __n characters. Return value is the number of characters |
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// written. |
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237 |
|
22
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virtual streamsize xsputn(const char_type* __s, streamsize __n) { |
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streamsize __result = 0; |
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const int_type __eof = _Traits::eof(); |
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241 |
|
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while (__result < __n) { |
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if (_M_pnext < _M_pend) { |
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size_t __chunk = (min) (__STATIC_CAST(size_t,_M_pend - _M_pnext), |
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__STATIC_CAST(size_t,__n - __result)); |
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_Traits::copy(_M_pnext, __s, __chunk); |
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__result += __chunk; |
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__s += __chunk; |
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_M_pnext += __chunk; |
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} |
0
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251 |
|
22
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else if (!_Traits::eq_int_type(this->overflow(_Traits::to_int_type(*__s)), |
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__eof)) { |
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++__result; |
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++__s; |
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} |
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else |
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break; |
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} |
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return __result; |
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} |
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262 |
|
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// Extension: writes up to __n copies of __c. Return value is the number |
0
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// of characters written. |
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265 |
|
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virtual streamsize _M_xsputnc(char_type __c, streamsize __n) { |
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streamsize __result = 0; |
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const int_type __eof = _Traits::eof(); |
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269 |
|
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while (__result < __n) { |
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if (_M_pnext < _M_pend) { |
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size_t __chunk = (min) (__STATIC_CAST(size_t,_M_pend - _M_pnext), |
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__STATIC_CAST(size_t,__n - __result)); |
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_Traits::assign(_M_pnext, __chunk, __c); |
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__result += __chunk; |
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_M_pnext += __chunk; |
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} |
0
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278 |
|
22
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else if (!_Traits::eq_int_type(this->overflow(_Traits::to_int_type(__c)), |
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__eof)) |
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++__result; |
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282 |
else |
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283 |
break; |
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284 |
} |
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285 |
return __result; |
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286 |
} |
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|
287 |
|
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// Called when there is no write position. All subclasses are expected to |
0
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// override this virtual member function. |
22
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290 |
|
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virtual int_type overflow(int_type = traits_type::eof()) { |
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return _Traits::eof(); |
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293 |
} |
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294 |
|
0
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295 |
|
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296 |
public: // Public members for writing characters. |
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297 |
// Write a single character. |
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int_type sputc(char_type __c) { |
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return ((_M_pnext < _M_pend) ? _Traits::to_int_type(*_M_pnext++ = __c) |
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: this->overflow(_Traits::to_int_type(__c))); |
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301 |
} |
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|
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// Write __n characters. |
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streamsize sputn(const char_type* __s, streamsize __n) |
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{ return this->xsputn(__s, __n); } |
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|
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// Extension: write __n copies of __c. |
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streamsize _M_sputnc(char_type __c, streamsize __n) |
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{ return this->_M_xsputnc(__c, __n); } |
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|
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private: // Helper functions. |
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int_type _M_snextc_aux(); |
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|
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public: // Public members for reading characters. |
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streamsize in_avail() { |
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return (_M_gnext < _M_gend) ? (_M_gend - _M_gnext) : this->showmanyc(); |
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} |
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|
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// Advance to the next character and return it. |
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int_type snextc() { |
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return ( _M_gend - _M_gnext > 1 ? |
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_Traits::to_int_type(*++_M_gnext) : |
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this->_M_snextc_aux()); |
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} |
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|
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// Return the current character and advance to the next. |
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int_type sbumpc() { |
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return _M_gnext < _M_gend ? _Traits::to_int_type(*_M_gnext++) |
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: this->uflow(); |
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} |
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|
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// Return the current character without advancing to the next. |
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int_type sgetc() { |
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return _M_gnext < _M_gend ? _Traits::to_int_type(*_M_gnext) |
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: this->underflow(); |
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} |
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337 |
|
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streamsize sgetn(char_type* __s, streamsize __n) |
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{ return this->xsgetn(__s, __n); } |
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|
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int_type sputbackc(char_type __c) { |
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return ((_M_gbegin < _M_gnext) && _Traits::eq(__c, *(_M_gnext - 1))) |
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? _Traits::to_int_type(*--_M_gnext) |
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: this->pbackfail(_Traits::to_int_type(__c)); |
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} |
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|
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int_type sungetc() { |
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return (_M_gbegin < _M_gnext) |
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? _Traits::to_int_type(*--_M_gnext) |
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: this->pbackfail(); |
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} |
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|
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protected: // Virtual locale functions. |
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|
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// This is a hook, called by pubimbue() just before pubimbue() |
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// sets the streambuf's locale to __loc. Note that imbue should |
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// not (and cannot, since it has no access to streambuf's private |
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// members) set the streambuf's locale itself. |
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|
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virtual void imbue(const locale&) {} |
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|
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public: // Locale-related functions. |
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locale pubimbue(const locale&); |
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locale getloc() const { return _M_locale; } |
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|
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#if !defined (_STLP_NO_ANACHRONISMS) |
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void stossc() { this->sbumpc(); } |
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#endif |
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#if defined (__MVS__) || defined (__OS400__) |
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private: // Data members. |
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|
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char_type* _M_gbegin; // Beginning of get area |
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char_type* _M_gnext; // Current position within the get area |
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char_type* _M_gend; // End of get area |
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|
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char_type* _M_pbegin; // Beginning of put area |
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char_type* _M_pnext; // Current position within the put area |
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char_type* _M_pend; // End of put area |
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#endif |
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}; |
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|
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#if defined (_STLP_USE_TEMPLATE_EXPORT) |
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_STLP_EXPORT_TEMPLATE_CLASS basic_streambuf<char, char_traits<char> >; |
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# if !defined (_STLP_NO_WCHAR_T) |
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_STLP_EXPORT_TEMPLATE_CLASS basic_streambuf<wchar_t, char_traits<wchar_t> >; |
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# endif // _STLP_NO_WCHAR_T |
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#endif // _STLP_USE_TEMPLATE_EXPORT |
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|
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_STLP_END_NAMESPACE |
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|
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#if defined (_STLP_EXPOSE_STREAM_IMPLEMENTATION) && !defined (_STLP_LINK_TIME_INSTANTIATION) |
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# include <stl/_streambuf.c> |
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#endif |
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|
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#endif |
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|
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// Local Variables: |
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// mode:C++ |
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// End: |