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477 lines
12 KiB
C++
477 lines
12 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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//Forward declare boost::rv
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template <class T> class rv;
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namespace move_detail {
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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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// 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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// 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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// 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_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_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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// 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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//
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// has_move_emulation_enabled_impl
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//
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//////////////////////////////////////////////////////////////////////////////
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template<class T>
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struct has_move_emulation_enabled_impl
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: is_convertible< T, ::boost::rv<T>& >
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{};
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template<class T>
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struct has_move_emulation_enabled_impl<T&>
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{ static const bool value = false; };
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template<class T>
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struct has_move_emulation_enabled_impl< ::boost::rv<T> >
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{ static const bool value = false; };
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//////////////////////////////////////////////////////////////////////////////
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//
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// is_rv_impl
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//
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//////////////////////////////////////////////////////////////////////////////
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template <class T>
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struct is_rv_impl
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{ static const bool value = false; };
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template <class T>
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struct is_rv_impl< rv<T> >
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{ static const bool value = true; };
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template <class T>
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struct is_rv_impl< const rv<T> >
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{ static const bool value = true; };
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// Code from Jeffrey Lee Hellrung, many thanks
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template< class T >
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struct is_rvalue_reference
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{ static const bool value = false; };
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T >
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struct is_rvalue_reference< T&& >
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{ static const bool value = true; };
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#else // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T >
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struct is_rvalue_reference< boost::rv<T>& >
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{ static const bool value = true; };
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template< class T >
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struct is_rvalue_reference< const boost::rv<T>& >
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{ static const bool value = true; };
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#endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T >
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struct add_rvalue_reference
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{ typedef T&& type; };
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#else // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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namespace detail_add_rvalue_reference
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{
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template< class T
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, bool emulation = has_move_emulation_enabled_impl<T>::value
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, bool rv = is_rv_impl<T>::value >
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struct add_rvalue_reference_impl { typedef T type; };
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template< class T, bool emulation>
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struct add_rvalue_reference_impl< T, emulation, true > { typedef T & type; };
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template< class T, bool rv >
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struct add_rvalue_reference_impl< T, true, rv > { typedef ::boost::rv<T>& type; };
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} // namespace detail_add_rvalue_reference
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template< class T >
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struct add_rvalue_reference
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: detail_add_rvalue_reference::add_rvalue_reference_impl<T>
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{ };
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template< class T >
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struct add_rvalue_reference<T &>
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{ typedef T & type; };
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#endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T > struct remove_rvalue_reference { typedef T type; };
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T > struct remove_rvalue_reference< T&& > { typedef T type; };
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#else // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template< class T > struct remove_rvalue_reference< rv<T> > { typedef T type; };
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template< class T > struct remove_rvalue_reference< const rv<T> > { typedef T type; };
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template< class T > struct remove_rvalue_reference< volatile rv<T> > { typedef T type; };
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template< class T > struct remove_rvalue_reference< const volatile rv<T> > { typedef T type; };
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template< class T > struct remove_rvalue_reference< rv<T>& > { typedef T type; };
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template< class T > struct remove_rvalue_reference< const rv<T>& > { typedef T type; };
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template< class T > struct remove_rvalue_reference< volatile rv<T>& > { typedef T type; };
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template< class T > struct remove_rvalue_reference< const volatile rv<T>& >{ typedef T type; };
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#endif // #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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// Ideas from Boost.Move review, Jeffrey Lee Hellrung:
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//
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//- TypeTraits metafunctions is_lvalue_reference, add_lvalue_reference, and remove_lvalue_reference ?
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// Perhaps add_reference and remove_reference can be modified so that they behave wrt emulated rvalue
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// references the same as wrt real rvalue references, i.e., add_reference< rv<T>& > -> T& rather than
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// rv<T>& (since T&& & -> T&).
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//
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//- Add'l TypeTraits has_[trivial_]move_{constructor,assign}...?
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//
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//- An as_lvalue(T& x) function, which amounts to an identity operation in C++0x, but strips emulated
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// rvalue references in C++03. This may be necessary to prevent "accidental moves".
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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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