fpos.h

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00001 // File position object and stream types 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00030 // 00031 // ISO C++ 14882: 27 Input/output library 00032 // 00033 00034 /** @file fpos.h 00035 * This is an internal header file, included by other library headers. 00036 * You should not attempt to use it directly. 00037 */ 00038 00039 #ifndef _CPP_BITS_FPOS_H 00040 #define _CPP_BITS_FPOS_H 1 00041 00042 #pragma GCC system_header 00043 00044 #include <bits/c++io.h> 00045 #include <cwchar> // For mbstate_t. 00046 00047 namespace std 00048 { 00049 // 27.4.1 Types 00050 00051 // [27.4.3] template class fpos 00052 /** 00053 * @doctodo 00054 */ 00055 template<typename _StateT> 00056 class fpos 00057 { 00058 public: 00059 // Types: 00060 typedef _StateT __state_type; 00061 00062 private: 00063 streamoff _M_off; 00064 __state_type _M_st; 00065 00066 public: 00067 __state_type 00068 state() const { return _M_st; } 00069 00070 void 00071 state(__state_type __st) { _M_st = __st; } 00072 00073 // NB: The standard defines only the implicit copy ctor and the 00074 // previous two members. The rest is a "conforming extension". 00075 fpos(): _M_off(streamoff()), _M_st(__state_type()) { } 00076 00077 fpos(streamoff __off, __state_type __st = __state_type()) 00078 : _M_off(__off), _M_st(__st) { } 00079 00080 operator streamoff() const { return _M_off; } 00081 00082 fpos& 00083 operator+=(streamoff __off) { _M_off += __off; return *this; } 00084 00085 fpos& 00086 operator-=(streamoff __off) { _M_off -= __off; return *this; } 00087 00088 fpos 00089 operator+(streamoff __off) 00090 { 00091 fpos __t(*this); 00092 __t += __off; 00093 return __t; 00094 } 00095 00096 fpos 00097 operator-(streamoff __off) 00098 { 00099 fpos __t(*this); 00100 __t -= __off; 00101 return __t; 00102 } 00103 00104 bool 00105 operator==(const fpos& __pos) const 00106 { return _M_off == __pos._M_off; } 00107 00108 bool 00109 operator!=(const fpos& __pos) const 00110 { return _M_off != __pos._M_off; } 00111 00112 streamoff 00113 _M_position() const { return _M_off; } 00114 00115 void 00116 _M_position(streamoff __off) { _M_off = __off; } 00117 }; 00118 00119 /// 27.2, paragraph 10 about fpos/char_traits circularity 00120 typedef fpos<mbstate_t> streampos; 00121 # ifdef _GLIBCPP_USE_WCHAR_T 00122 /// 27.2, paragraph 10 about fpos/char_traits circularity 00123 typedef fpos<mbstate_t> wstreampos; 00124 # endif 00125 } // namespace std 00126 00127 #endif

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