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Diffstat (limited to 'contrib/libstdc++/include/bits/type_traits.h')
| -rw-r--r-- | contrib/libstdc++/include/bits/type_traits.h | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/contrib/libstdc++/include/bits/type_traits.h b/contrib/libstdc++/include/bits/type_traits.h new file mode 100644 index 0000000..61bc436 --- /dev/null +++ b/contrib/libstdc++/include/bits/type_traits.h @@ -0,0 +1,339 @@ +// Type traits implementation -*- C++ -*- + +// Copyright (C) 2001 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/* + * + * Copyright (c) 1997 + * Silicon Graphics Computer Systems, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Silicon Graphics makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + */ + +/** @file type_traits.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +#ifndef _CPP_BITS_TYPE_TRAITS_H +#define _CPP_BITS_TYPE_TRAITS_H 1 + +#pragma GCC system_header + +#include <bits/c++config.h> + +/* +This header file provides a framework for allowing compile time dispatch +based on type attributes. This is useful when writing template code. +For example, when making a copy of an array of an unknown type, it helps +to know if the type has a trivial copy constructor or not, to help decide +if a memcpy can be used. + +The class template __type_traits provides a series of typedefs each of +which is either __true_type or __false_type. The argument to +__type_traits can be any type. The typedefs within this template will +attain their correct values by one of these means: + 1. The general instantiation contain conservative values which work + for all types. + 2. Specializations may be declared to make distinctions between types. + 3. Some compilers (such as the Silicon Graphics N32 and N64 compilers) + will automatically provide the appropriate specializations for all + types. + +EXAMPLE: + +//Copy an array of elements which have non-trivial copy constructors +template <class _Tp> void + copy(_Tp* __source,_Tp* __destination,int __n,__false_type); +//Copy an array of elements which have trivial copy constructors. Use memcpy. +template <class _Tp> void + copy(_Tp* __source,_Tp* __destination,int __n,__true_type); + +//Copy an array of any type by using the most efficient copy mechanism +template <class _Tp> inline void copy(_Tp* __source,_Tp* __destination,int __n) { + copy(__source,__destination,__n, + typename __type_traits<_Tp>::has_trivial_copy_constructor()); +} +*/ + +struct __true_type {}; +struct __false_type {}; + +template <class _Tp> +struct __type_traits { + typedef __true_type this_dummy_member_must_be_first; + /* Do not remove this member. It informs a compiler which + automatically specializes __type_traits that this + __type_traits template is special. It just makes sure that + things work if an implementation is using a template + called __type_traits for something unrelated. */ + + /* The following restrictions should be observed for the sake of + compilers which automatically produce type specific specializations + of this class: + - You may reorder the members below if you wish + - You may remove any of the members below if you wish + - You must not rename members without making the corresponding + name change in the compiler + - Members you add will be treated like regular members unless + you add the appropriate support in the compiler. */ + + + typedef __false_type has_trivial_default_constructor; + typedef __false_type has_trivial_copy_constructor; + typedef __false_type has_trivial_assignment_operator; + typedef __false_type has_trivial_destructor; + typedef __false_type is_POD_type; +}; + + +// Provide some specializations. + +template<> struct __type_traits<bool> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<char> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<signed char> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<unsigned char> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<wchar_t> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<short> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<unsigned short> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<int> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<unsigned int> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<long> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<unsigned long> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<long long> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<unsigned long long> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<float> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<double> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template<> struct __type_traits<long double> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + +template <class _Tp> +struct __type_traits<_Tp*> { + typedef __true_type has_trivial_default_constructor; + typedef __true_type has_trivial_copy_constructor; + typedef __true_type has_trivial_assignment_operator; + typedef __true_type has_trivial_destructor; + typedef __true_type is_POD_type; +}; + + +// The following could be written in terms of numeric_limits. +// We're doing it separately to reduce the number of dependencies. + +template <class _Tp> struct _Is_integer { + typedef __false_type _Integral; +}; + +template<> struct _Is_integer<bool> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<char> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<signed char> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<unsigned char> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<wchar_t> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<short> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<unsigned short> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<int> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<unsigned int> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<long> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<unsigned long> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<long long> { + typedef __true_type _Integral; +}; + +template<> struct _Is_integer<unsigned long long> { + typedef __true_type _Integral; +}; + +template<typename _Tp> struct _Is_normal_iterator { + typedef __false_type _Normal; +}; + +// Forward declaration hack, should really include this from somewhere. +namespace __gnu_cxx +{ + template<typename _Iterator, typename _Container> class __normal_iterator; +} + +template<typename _Iterator, typename _Container> +struct _Is_normal_iterator< __gnu_cxx::__normal_iterator<_Iterator, _Container> > { + typedef __true_type _Normal; +}; + +#endif /* _CPP_BITS_TYPE_TRAITS_H */ + +// Local Variables: +// mode:C++ +// End: |
