forked from boostorg/move
664 lines
14 KiB
C++
664 lines
14 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2012-2012.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/move for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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//! \file
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#ifndef BOOST_MOVE_DETAIL_META_UTILS_HPP
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#define BOOST_MOVE_DETAIL_META_UTILS_HPP
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#include <boost/move/detail/config_begin.hpp>
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#include <cstddef> //for std::size_t
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//Small meta-typetraits to support move
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namespace boost {
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#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
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//Forward declare boost::rv
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template <class T> class rv;
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#endif
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namespace move_detail {
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//////////////////////////////////////
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// empty
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//////////////////////////////////////
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struct empty{};
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//////////////////////////////////////
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// nat
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//////////////////////////////////////
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struct nat{};
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//////////////////////////////////////
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// natify
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//////////////////////////////////////
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template <class T> struct natify{};
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//////////////////////////////////////
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// if_c
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//////////////////////////////////////
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template<bool C, typename T1, typename T2>
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struct if_c
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{
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typedef T1 type;
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};
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template<typename T1, typename T2>
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struct if_c<false,T1,T2>
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{
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typedef T2 type;
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};
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//////////////////////////////////////
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// if_
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//////////////////////////////////////
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template<typename T1, typename T2, typename T3>
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struct if_
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{
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typedef typename if_c<0 != T1::value, T2, T3>::type type;
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};
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//enable_if_
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template <bool B, class T = nat>
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struct enable_if_c
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{
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typedef T type;
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};
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//////////////////////////////////////
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// enable_if_c
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//////////////////////////////////////
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template <class T>
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struct enable_if_c<false, T> {};
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//////////////////////////////////////
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// enable_if
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//////////////////////////////////////
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template <class Cond, class T = nat>
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struct enable_if : public enable_if_c<Cond::value, T> {};
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//////////////////////////////////////
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// disable_if
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//////////////////////////////////////
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template <class Cond, class T = nat>
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struct disable_if : public enable_if_c<!Cond::value, T> {};
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//////////////////////////////////////
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// integral_constant
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//////////////////////////////////////
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template<class T, T v>
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struct integral_constant
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{
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static const T value = v;
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typedef T value_type;
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typedef integral_constant<T, v> type;
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};
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typedef integral_constant<bool, true > true_type;
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typedef integral_constant<bool, false > false_type;
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//////////////////////////////////////
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// identity
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//////////////////////////////////////
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template <class T>
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struct identity
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{
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typedef T type;
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};
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//////////////////////////////////////
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// and_
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//////////////////////////////////////
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template <typename Condition1, typename Condition2, typename Condition3 = integral_constant<bool, true> >
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struct and_
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: public integral_constant<bool, Condition1::value && Condition2::value && Condition3::value>
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{};
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//////////////////////////////////////
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// not_
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//////////////////////////////////////
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template <typename Boolean>
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struct not_
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: public integral_constant<bool, !Boolean::value>
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{};
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//////////////////////////////////////
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// remove_reference
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//////////////////////////////////////
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template<class T>
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struct remove_reference
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{
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typedef T type;
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};
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template<class T>
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struct remove_reference<T&>
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{
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typedef T type;
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<class T>
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struct remove_reference<T&&>
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{
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typedef T type;
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};
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#else
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template<class T>
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struct remove_reference< rv<T> >
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{
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typedef T type;
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};
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template<class T>
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struct remove_reference< rv<T> &>
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{
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typedef T type;
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};
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template<class T>
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struct remove_reference< const rv<T> &>
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{
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typedef T type;
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};
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#endif
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//////////////////////////////////////
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// remove_const
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//////////////////////////////////////
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template< class T >
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struct remove_const
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{
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typedef T type;
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};
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template< class T >
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struct remove_const<const T>
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{
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typedef T type;
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};
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//////////////////////////////////////
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// remove_volatile
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//////////////////////////////////////
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template< class T >
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struct remove_volatile
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{
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typedef T type;
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};
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template< class T >
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struct remove_volatile<volatile T>
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{
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typedef T type;
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};
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//////////////////////////////////////
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// remove_cv
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//////////////////////////////////////
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template< class T >
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struct remove_cv
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{
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typedef typename remove_volatile
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<typename remove_const<T>::type>::type type;
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};
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//////////////////////////////////////
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// add_const
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//////////////////////////////////////
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template<class T>
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struct add_const
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{
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typedef const T type;
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};
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template<class T>
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struct add_const<T&>
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{
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typedef const T& type;
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<class T>
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struct add_const<T&&>
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{
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typedef T&& type;
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};
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#endif
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//////////////////////////////////////
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// remove_extent
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//////////////////////////////////////
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template<class T>
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struct remove_extent
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{
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typedef T type;
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};
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template<class T>
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struct remove_extent<T[]>
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{
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typedef T type;
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};
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template<class T, std::size_t N>
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struct remove_extent<T[N]>
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{
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typedef T type;
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};
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//////////////////////////////////////
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// extent
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//////////////////////////////////////
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template<class T, unsigned N = 0>
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struct extent
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{
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static const std::size_t value = 0;
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};
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template<class T>
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struct extent<T[], 0>
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{
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static const std::size_t value = 0;
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};
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template<class T, unsigned N>
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struct extent<T[], N>
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{
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static const std::size_t value = extent<T, N-1>::value;
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};
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template<class T, std::size_t N>
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struct extent<T[N], 0>
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{
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static const std::size_t value = N;
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};
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template<class T, std::size_t I, unsigned N>
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struct extent<T[I], N>
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{
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static const std::size_t value = extent<T, N-1>::value;
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};
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//////////////////////////////////////
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// element_pointer
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//////////////////////////////////////
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template<class T>
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struct element_pointer
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{
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typedef typename remove_extent<T>::type element_type;
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typedef element_type* type;
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};
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//////////////////////////////////////
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// add_lvalue_reference
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//////////////////////////////////////
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template<class T>
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struct add_lvalue_reference
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{
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typedef T& type;
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};
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template<class T>
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struct add_lvalue_reference<T&>
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{
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typedef T& type;
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};
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template<>
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struct add_lvalue_reference<void>
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{
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typedef void type;
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};
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template<>
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struct add_lvalue_reference<const void>
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{
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typedef const void type;
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};
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template<>
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struct add_lvalue_reference<volatile void>
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{
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typedef volatile void type;
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};
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template<>
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struct add_lvalue_reference<const volatile void>
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{
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typedef const volatile void type;
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};
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template<class T>
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struct add_const_lvalue_reference
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{
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typedef typename remove_reference<T>::type t_unreferenced;
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typedef typename add_const<t_unreferenced>::type t_unreferenced_const;
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typedef typename add_lvalue_reference
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<t_unreferenced_const>::type type;
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};
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//////////////////////////////////////
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// is_same
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//////////////////////////////////////
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template<class T, class U>
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struct is_same
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{
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static const bool value = false;
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};
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template<class T>
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struct is_same<T, T>
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{
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static const bool value = true;
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};
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//////////////////////////////////////
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// is_pointer
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//////////////////////////////////////
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template< class T >
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struct is_pointer
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{
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static const bool value = false;
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};
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template< class T >
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struct is_pointer<T*>
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{
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static const bool value = true;
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};
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//////////////////////////////////////
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// is_reference
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//////////////////////////////////////
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template< class T >
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struct is_reference
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{
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static const bool value = false;
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};
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template< class T >
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struct is_reference<T&>
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{
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static const bool value = true;
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T >
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struct is_reference<T&&>
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{
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static const bool value = true;
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};
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#endif
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//////////////////////////////////////
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// is_lvalue_reference
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//////////////////////////////////////
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template<class T>
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struct is_lvalue_reference
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{
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static const bool value = false;
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};
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template<class T>
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struct is_lvalue_reference<T&>
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{
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static const bool value = true;
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};
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//////////////////////////////////////
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// is_array
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//////////////////////////////////////
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template<class T>
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struct is_array
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{
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static const bool value = false;
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};
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template<class T>
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struct is_array<T[]>
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{
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static const bool value = true;
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};
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template<class T, std::size_t N>
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struct is_array<T[N]>
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{
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static const bool value = true;
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};
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//////////////////////////////////////
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// is_class_or_union
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//////////////////////////////////////
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template<class T>
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struct is_class_or_union
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{
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struct twochar { char _[2]; };
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template <class U>
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static char is_class_or_union_tester(void(U::*)(void));
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template <class U>
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static twochar is_class_or_union_tester(...);
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static const bool value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(char);
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};
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//////////////////////////////////////
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// addressof
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//////////////////////////////////////
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template<class T>
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struct addr_impl_ref
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{
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T & v_;
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inline addr_impl_ref( T & v ): v_( v ) {}
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inline operator T& () const { return v_; }
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private:
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addr_impl_ref & operator=(const addr_impl_ref &);
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};
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template<class T>
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struct addressof_impl
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{
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static inline T * f( T & v, long )
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{
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return reinterpret_cast<T*>(
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&const_cast<char&>(reinterpret_cast<const volatile char &>(v)));
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}
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static inline T * f( T * v, int )
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{ return v; }
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};
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template<class T>
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inline T * addressof( T & v )
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{
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return ::boost::move_detail::addressof_impl<T>::f
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( ::boost::move_detail::addr_impl_ref<T>( v ), 0 );
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}
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//////////////////////////////////////
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// has_pointer_type
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//////////////////////////////////////
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template <class T>
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struct has_pointer_type
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{
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struct two { char c[2]; };
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template <class U> static two test(...);
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template <class U> static char test(typename U::pointer* = 0);
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static const bool value = sizeof(test<T>(0)) == 1;
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};
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//////////////////////////////////////
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// pointer_type
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//////////////////////////////////////
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template <class T, class D, bool = has_pointer_type<D>::value>
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struct pointer_type_imp
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{
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typedef typename D::pointer type;
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};
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template <class T, class D>
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struct pointer_type_imp<T, D, false>
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{
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typedef typename remove_extent<T>::type* type;
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};
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template <class T, class D>
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struct pointer_type
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{
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typedef typename pointer_type_imp
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<typename remove_extent<T>::type, typename remove_reference<D>::type>::type type;
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};
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//////////////////////////////////////
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// is_convertible
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//////////////////////////////////////
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#if defined(_MSC_VER) && (_MSC_VER >= 1400)
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//use intrinsic since in MSVC
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//overaligned types can't go through ellipsis
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template <class T, class U>
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struct is_convertible
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{
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static const bool value = __is_convertible_to(T, U);
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};
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#else
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template <class T, class U>
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class is_convertible
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{
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typedef typename add_lvalue_reference<T>::type t_reference;
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typedef char true_t;
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class false_t { char dummy[2]; };
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static false_t dispatch(...);
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static true_t dispatch(U);
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static t_reference trigger();
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public:
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static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
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};
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#endif
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//////////////////////////////////////
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// is_unary_function
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//////////////////////////////////////
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#if defined(BOOST_MSVC) || defined(__BORLANDC_)
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#define BOOST_MOVE_TT_DECL __cdecl
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#else
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#define BOOST_MOVE_TT_DECL
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#endif
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#if defined(_MSC_EXTENSIONS) && !defined(__BORLAND__) && !defined(_WIN64) && !defined(_M_ARM) && !defined(UNDER_CE)
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#define BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
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#endif
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template <typename T>
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struct is_unary_function_impl
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{ static const bool value = false; };
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// avoid duplicate definitions of is_unary_function_impl
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#ifndef BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
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template <typename R>
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struct is_unary_function_impl<R (*)()>
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{ static const bool value = true; };
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template <typename R>
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struct is_unary_function_impl<R (*)(...)>
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{ static const bool value = true; };
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#else // BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
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template <typename R>
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struct is_unary_function_impl<R (__stdcall*)()>
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{ static const bool value = true; };
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#ifndef _MANAGED
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template <typename R>
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struct is_unary_function_impl<R (__fastcall*)()>
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{ static const bool value = true; };
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#endif
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template <typename R>
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struct is_unary_function_impl<R (__cdecl*)()>
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{ static const bool value = true; };
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template <typename R>
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struct is_unary_function_impl<R (__cdecl*)(...)>
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{ static const bool value = true; };
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#endif
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|
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// avoid duplicate definitions of is_unary_function_impl
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#ifndef BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
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template <typename R, class T0>
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struct is_unary_function_impl<R (*)(T0)>
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{ static const bool value = true; };
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template <typename R, class T0>
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struct is_unary_function_impl<R (*)(T0...)>
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{ static const bool value = true; };
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#else // BOOST_MOVE_TT_TEST_MSC_FUNC_SIGS
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|
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template <typename R, class T0>
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struct is_unary_function_impl<R (__stdcall*)(T0)>
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{ static const bool value = true; };
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|
|
#ifndef _MANAGED
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|
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template <typename R, class T0>
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struct is_unary_function_impl<R (__fastcall*)(T0)>
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{ static const bool value = true; };
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|
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#endif
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|
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template <typename R, class T0>
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struct is_unary_function_impl<R (__cdecl*)(T0)>
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|
{ static const bool value = true; };
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|
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template <typename R, class T0>
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struct is_unary_function_impl<R (__cdecl*)(T0...)>
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{ static const bool value = true; };
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#endif
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template <typename T>
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struct is_unary_function_impl<T&>
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{ static const bool value = false; };
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template<typename T>
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struct is_unary_function
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{ static const bool value = is_unary_function_impl<T>::value; };
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} //namespace move_detail {
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} //namespace boost {
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#include <boost/move/detail/config_end.hpp>
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#endif //#ifndef BOOST_MOVE_DETAIL_META_UTILS_HPP
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