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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2012-2012.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/move for documentation.
//
//////////////////////////////////////////////////////////////////////////////
//! \file
#ifndef BOOST_MOVE_DETAIL_META_UTILS_HPP
#define BOOST_MOVE_DETAIL_META_UTILS_HPP
#include <boost/move/detail/config_begin.hpp>
//Small meta-typetraits to support move
namespace boost {
namespace move_detail {
//if_
template<bool C, typename T1, typename T2>
struct if_c
{
typedef T1 type;
};
template<typename T1, typename T2>
struct if_c<false,T1,T2>
{
typedef T2 type;
};
template<typename T1, typename T2, typename T3>
struct if_
{
typedef typename if_c<0 != T1::value, T2, T3>::type type;
};
//enable_if_
template <bool B, class T = void>
struct enable_if_c
{
typedef T type;
};
template <class T>
struct enable_if_c<false, T> {};
template <class Cond, class T = void>
struct enable_if : public enable_if_c<Cond::value, T> {};
template <class Cond, class T = void>
struct disable_if : public enable_if_c<!Cond::value, T> {};
//integral_constant
template<class T, T v>
struct integral_constant
{
static const T value = v;
typedef T value_type;
typedef integral_constant<T, v> type;
};
//identity
template <class T>
struct identity
{
typedef T type;
};
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
//use intrinsic since in MSVC
//overaligned types can't go through ellipsis
template <class T, class U>
struct is_convertible
{
static const bool value = __is_convertible_to(T, U);
};
#else
template <class T, class U>
class is_convertible
{
typedef char true_t;
class false_t { char dummy[2]; };
static false_t dispatch(...);
static true_t dispatch(U);
static T &trigger();
public:
static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
};
#endif
//and_ not_
template <typename Condition1, typename Condition2, typename Condition3 = integral_constant<bool, true> >
struct and_
: public integral_constant<bool, Condition1::value && Condition2::value && Condition3::value>
{};
template <typename Boolean>
struct not_
: public integral_constant<bool, !Boolean::value>
{};
//is_lvalue_reference
template<class T>
struct is_lvalue_reference
: public integral_constant<bool, false>
{};
template<class T>
struct is_lvalue_reference<T&>
: public integral_constant<bool, true>
{};
template<class T>
struct is_class_or_union
{
struct twochar { char _[2]; };
template <class U>
static char is_class_or_union_tester(void(U::*)(void));
template <class U>
static twochar is_class_or_union_tester(...);
static const bool value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(char);
};
struct empty{};
//addressof
template<class T> struct addr_impl_ref
{
T & v_;
inline addr_impl_ref( T & v ): v_( v ) {}
inline operator T& () const { return v_; }
private:
addr_impl_ref & operator=(const addr_impl_ref &);
};
template<class T> struct addressof_impl
{
static inline T * f( T & v, long )
{
return reinterpret_cast<T*>(
&const_cast<char&>(reinterpret_cast<const volatile char &>(v)));
}
static inline T * f( T * v, int )
{ return v; }
};
template<class T>
inline T * addressof( T & v )
{
return ::boost::move_detail::addressof_impl<T>::f
( ::boost::move_detail::addr_impl_ref<T>( v ), 0 );
}
} //namespace move_detail {
} //namespace boost {
#include <boost/move/detail/config_end.hpp>
#endif //#ifndef BOOST_MOVE_DETAIL_META_UTILS_HPP
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