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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/bits/postypes.h')
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1 files changed, 241 insertions, 0 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/bits/postypes.h b/gcc-4.4.3/libstdc++-v3/include/bits/postypes.h new file mode 100644 index 000000000..8066d9b00 --- /dev/null +++ b/gcc-4.4.3/libstdc++-v3/include/bits/postypes.h @@ -0,0 +1,241 @@ +// Position types -*- C++ -*- + +// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, +// 2006, 2007, 2008, 2009 +// 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 postypes.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +// +// ISO C++ 14882: 27.4.1 - Types +// ISO C++ 14882: 27.4.3 - Template class fpos +// + +#ifndef _GLIBCXX_POSTYPES_H +#define _GLIBCXX_POSTYPES_H 1 + +#pragma GCC system_header + +#include <cwchar> // For mbstate_t + +// XXX If <stdint.h> is really needed, make sure to define the macros +// before including it, in order not to break <tr1/cstdint> (and <cstdint> +// in C++0x). Reconsider all this as soon as possible... +#if (defined(_GLIBCXX_HAVE_INT64_T) && !defined(_GLIBCXX_HAVE_INT64_T_LONG) \ + && !defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG)) + +#ifndef __STDC_LIMIT_MACROS +# define _UNDEF__STDC_LIMIT_MACROS +# define __STDC_LIMIT_MACROS +#endif +#ifndef __STDC_CONSTANT_MACROS +# define _UNDEF__STDC_CONSTANT_MACROS +# define __STDC_CONSTANT_MACROS +#endif +#include <stdint.h> // For int64_t +#ifdef _UNDEF__STDC_LIMIT_MACROS +# undef __STDC_LIMIT_MACROS +# undef _UNDEF__STDC_LIMIT_MACROS +#endif +#ifdef _UNDEF__STDC_CONSTANT_MACROS +# undef __STDC_CONSTANT_MACROS +# undef _UNDEF__STDC_CONSTANT_MACROS +#endif + +#endif + +_GLIBCXX_BEGIN_NAMESPACE(std) + + // The types streamoff, streampos and wstreampos and the class + // template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2, + // 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the + // behaviour of these types is mostly implementation defined or + // unspecified. The behaviour in this implementation is as noted + // below. + + /** + * @brief Type used by fpos, char_traits<char>, and char_traits<wchar_t>. + * + * In clauses 21.1.3.1 and 27.4.1 streamoff is described as an + * implementation defined type. + * Note: In versions of GCC up to and including GCC 3.3, streamoff + * was typedef long. + */ +#ifdef _GLIBCXX_HAVE_INT64_T_LONG + typedef long streamoff; +#elif defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG) + typedef long long streamoff; +#elif defined(_GLIBCXX_HAVE_INT64_T) + typedef int64_t streamoff; +#else + typedef long long streamoff; +#endif + + /// Integral type for I/O operation counts and buffer sizes. + typedef ptrdiff_t streamsize; // Signed integral type + + /** + * @brief Class representing stream positions. + * + * The standard places no requirements upon the template parameter StateT. + * In this implementation StateT must be DefaultConstructible, + * CopyConstructible and Assignable. The standard only requires that fpos + * should contain a member of type StateT. In this implementation it also + * contains an offset stored as a signed integer. + * + * @param StateT Type passed to and returned from state(). + */ + template<typename _StateT> + class fpos + { + private: + streamoff _M_off; + _StateT _M_state; + + public: + // The standard doesn't require that fpos objects can be default + // constructed. This implementation provides a default + // constructor that initializes the offset to 0 and default + // constructs the state. + fpos() + : _M_off(0), _M_state() { } + + // The standard requires that fpos objects can be constructed + // from streamoff objects using the constructor syntax, and + // fails to give any meaningful semantics. In this + // implementation implicit conversion is also allowed, and this + // constructor stores the streamoff as the offset and default + // constructs the state. + /// Construct position from offset. + fpos(streamoff __off) + : _M_off(__off), _M_state() { } + + /// Convert to streamoff. + operator streamoff() const { return _M_off; } + + /// Remember the value of @a st. + void + state(_StateT __st) + { _M_state = __st; } + + /// Return the last set value of @a st. + _StateT + state() const + { return _M_state; } + + // The standard requires that this operator must be defined, but + // gives no semantics. In this implementation it just adds its + // argument to the stored offset and returns *this. + /// Add offset to this position. + fpos& + operator+=(streamoff __off) + { + _M_off += __off; + return *this; + } + + // The standard requires that this operator must be defined, but + // gives no semantics. In this implementation it just subtracts + // its argument from the stored offset and returns *this. + /// Subtract offset from this position. + fpos& + operator-=(streamoff __off) + { + _M_off -= __off; + return *this; + } + + // The standard requires that this operator must be defined, but + // defines its semantics only in terms of operator-. In this + // implementation it constructs a copy of *this, adds the + // argument to that copy using operator+= and then returns the + // copy. + /// Add position and offset. + fpos + operator+(streamoff __off) const + { + fpos __pos(*this); + __pos += __off; + return __pos; + } + + // The standard requires that this operator must be defined, but + // defines its semantics only in terms of operator+. In this + // implementation it constructs a copy of *this, subtracts the + // argument from that copy using operator-= and then returns the + // copy. + /// Subtract offset from position. + fpos + operator-(streamoff __off) const + { + fpos __pos(*this); + __pos -= __off; + return __pos; + } + + // The standard requires that this operator must be defined, but + // defines its semantics only in terms of operator+. In this + // implementation it returns the difference between the offset + // stored in *this and in the argument. + /// Subtract position to return offset. + streamoff + operator-(const fpos& __other) const + { return _M_off - __other._M_off; } + }; + + // The standard only requires that operator== must be an + // equivalence relation. In this implementation two fpos<StateT> + // objects belong to the same equivalence class if the contained + // offsets compare equal. + /// Test if equivalent to another position. + template<typename _StateT> + inline bool + operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs) + { return streamoff(__lhs) == streamoff(__rhs); } + + template<typename _StateT> + inline bool + operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs) + { return streamoff(__lhs) != streamoff(__rhs); } + + // Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos + // as implementation defined types, but clause 27.2 requires that + // they must both be typedefs for fpos<mbstate_t> + /// File position for char streams. + typedef fpos<mbstate_t> streampos; + /// File position for wchar_t streams. + typedef fpos<mbstate_t> wstreampos; + +#ifdef __GXX_EXPERIMENTAL_CXX0X__ + /// File position for char16_t streams. + typedef fpos<mbstate_t> u16streampos; + /// File position for char32_t streams. + typedef fpos<mbstate_t> u32streampos; +#endif + +_GLIBCXX_END_NAMESPACE + +#endif |