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 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 template<typename _StateT> 00053 class fpos 00054 { 00055 public: 00056 // Types: 00057 typedef _StateT __state_type; 00058 00059 private: 00060 streamoff _M_off; 00061 __state_type _M_st; 00062 00063 public: 00064 __state_type 00065 state() const { return _M_st; } 00066 00067 void 00068 state(__state_type __st) { _M_st = __st; } 00069 00070 // NB: The standard defines only the implicit copy ctor and the 00071 // previous two members. The rest is a "conforming extension". 00072 fpos(): _M_off(streamoff()), _M_st(__state_type()) { } 00073 00074 fpos(streamoff __off, __state_type __st = __state_type()) 00075 : _M_off(__off), _M_st(__st) { } 00076 00077 operator streamoff() const { return _M_off; } 00078 00079 fpos& 00080 operator+=(streamoff __off) { _M_off += __off; return *this; } 00081 00082 fpos& 00083 operator-=(streamoff __off) { _M_off -= __off; return *this; } 00084 00085 fpos 00086 operator+(streamoff __off) 00087 { 00088 fpos __t(*this); 00089 __t += __off; 00090 return __t; 00091 } 00092 00093 fpos 00094 operator-(streamoff __off) 00095 { 00096 fpos __t(*this); 00097 __t -= __off; 00098 return __t; 00099 } 00100 00101 bool 00102 operator==(const fpos& __pos) const 00103 { return _M_off == __pos._M_off; } 00104 00105 bool 00106 operator!=(const fpos& __pos) const 00107 { return _M_off != __pos._M_off; } 00108 00109 streamoff 00110 _M_position() const { return _M_off; } 00111 00112 void 00113 _M_position(streamoff __off) { _M_off = __off; } 00114 }; 00115 00116 // 27.2, paragraph 10 about fpos/char_traits circularity 00117 typedef fpos<mbstate_t> streampos; 00118 # ifdef _GLIBCPP_USE_WCHAR_T 00119 typedef fpos<mbstate_t> wstreampos; 00120 # endif 00121 } // namespace std 00122 00123 #endif

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