162 lines
4.6 KiB
C++
162 lines
4.6 KiB
C++
// class template tuple -*- C++ -*-
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// Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/** @file tr1/tuple
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* This is a TR1 C++ Library header.
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*/
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// Chris Jefferson <chris@bubblescope.net>
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#ifndef _TR1_TUPLE
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#define _TR1_TUPLE 1
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#include <tr1/utility>
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#include <tr1/ref_fwd.h>
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE(tr1)
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// An implementation specific class which is used in the tuple class
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// when the tuple is not maximum possible size.
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struct _NullClass { };
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/// Gives the type of the ith element of a given tuple type.
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template<int __i, typename _Tp>
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struct tuple_element;
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/// Finds the size of a given tuple type.
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template<typename _Tp>
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struct tuple_size;
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// Adds a const reference to a non-reference type.
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template<typename _Tp>
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struct __add_c_ref
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{ typedef const _Tp& type; };
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template<typename _Tp>
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struct __add_c_ref<_Tp&>
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{ typedef _Tp& type; };
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// Adds a reference to a non-reference type.
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template<typename _Tp>
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struct __add_ref
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{ typedef _Tp& type; };
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template<typename _Tp>
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struct __add_ref<_Tp&>
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{ typedef _Tp& type; };
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// Class used in the implementation of get
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template<int __i, typename _Tp>
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struct __get_helper;
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// Returns a const reference to the ith element of a tuple.
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// Any const or non-const ref elements are returned with their original type.
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// This class helps construct the various comparison operations on tuples
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template<int __check_equal_size, int __i, int __j, typename _Tp, typename _Up>
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struct __tuple_compare;
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// Helper which adds a reference to a type when given a reference_wrapper
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template<typename _Tp>
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struct __strip_reference_wrapper
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{
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typedef _Tp __type;
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};
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template<typename _Tp>
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struct __strip_reference_wrapper<reference_wrapper<_Tp> >
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{
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typedef _Tp& __type;
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};
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template<typename _Tp>
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struct __strip_reference_wrapper<const reference_wrapper<_Tp> >
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{
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typedef _Tp& __type;
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};
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#include "tuple_defs.h"
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template<int __i, int __j, typename _Tp, typename _Up>
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struct __tuple_compare<0, __i, __j, _Tp, _Up>
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{
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static bool __eq(const _Tp& __t, const _Up& __u)
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{
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return get<__i>(__t) == get<__i>(__u) &&
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__tuple_compare<0, __i+1, __j, _Tp, _Up>::__eq(__t, __u);
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}
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static bool __less(const _Tp& __t, const _Up& __u)
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{
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return (get<__i>(__t) < get<__i>(__u)) || !(get<__i>(__u) < get<__i>(__t)) &&
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__tuple_compare<0, __i+1, __j, _Tp, _Up>::__less(__t, __u);
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}
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};
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template<int __i, typename _Tp, typename _Up>
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struct __tuple_compare<0, __i, __i, _Tp, _Up>
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{
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static bool __eq(const _Tp&, const _Up&)
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{ return true; }
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static bool __less(const _Tp&, const _Up&)
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{ return false; }
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};
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// A class (and instance) which can be used in 'tie' when an element
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// of a tuple is not required
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struct swallow_assign
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{
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template<class T>
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swallow_assign&
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operator=(const T&)
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{ return *this; }
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};
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// TODO: Put this in some kind of shared file.
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namespace
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{
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swallow_assign ignore;
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}; // anonymous namespace
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_GLIBCXX_END_NAMESPACE
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}
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#define _GLIBCXX_CAT(x,y) _GLIBCXX_CAT2(x,y)
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#define _GLIBCXX_CAT2(x,y) x##y
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#define _SHORT_REPEAT
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#define _GLIBCXX_REPEAT_HEADER <tr1/tuple_iterate.h>
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#include <tr1/repeat.h>
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#undef _GLIBCXX_REPEAT_HEADER
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#undef _SHORT_REPEAT
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#include <tr1/functional>
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#endif
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