--- /dev/null
+// 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
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