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// (C) Copyright Antony Polukhin 2013.
//
// Use, modification and distribution are subject to 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/type_traits for most recent version including documentation.
#ifndef BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
#define BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
#include <boost/config.hpp>
#include <boost/type_traits/detail/yes_no_type.hpp>
#include <boost/type_traits/is_base_and_derived.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/is_rvalue_reference.hpp>
#include <boost/utility/declval.hpp>
#include <boost/noncopyable.hpp>
// should be the last #include
#include <boost/type_traits/detail/bool_trait_def.hpp>
namespace boost {
namespace detail{
template <bool DerivedFromNoncopyable, class T>
struct is_copy_constructible_impl2 {
// Intel compiler has problems with SFINAE for copy constructors and deleted functions:
//
// error: function *function_name* cannot be referenced -- it is a deleted function
// static boost::type_traits::yes_type test(T1&, decltype(T1(boost::declval<T1&>()))* = 0);
// ^
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_INTEL_CXX_VERSION)
#ifdef BOOST_NO_CXX11_DECLTYPE
template <class T1>
static boost::type_traits::yes_type test(T1&, boost::mpl::int_<sizeof(T1(boost::declval<T1&>()))>* = 0);
#else
template <class T1>
static boost::type_traits::yes_type test(T1&, decltype(T1(boost::declval<T1&>()))* = 0);
#endif
static boost::type_traits::no_type test(...);
#else
template <class T1>
static boost::type_traits::no_type test(T1&, typename T1::boost_move_no_copy_constructor_or_assign* = 0);
static boost::type_traits::yes_type test(...);
#endif
// If you see errors like this:
//
// `'T::T(const T&)' is private`
// `boost/type_traits/is_copy_constructible.hpp:68:5: error: within this context`
//
// then you are trying to call that macro for a structure defined like that:
//
// struct T {
// ...
// private:
// T(const T &);
// ...
// };
//
// To fix that you must modify your structure:
//
// // C++03 and C++11 version
// struct T: private boost::noncopyable {
// ...
// private:
// T(const T &);
// ...
// };
//
// // C++11 version
// struct T {
// ...
// private:
// T(const T &) = delete;
// ...
// };
BOOST_STATIC_CONSTANT(bool, value = (
sizeof(test(
boost::declval<BOOST_DEDUCED_TYPENAME boost::add_reference<T>::type>()
)) == sizeof(boost::type_traits::yes_type)
||
boost::is_rvalue_reference<T>::value
));
};
template <class T>
struct is_copy_constructible_impl2<true, T> {
BOOST_STATIC_CONSTANT(bool, value = false);
};
template <class T>
struct is_copy_constructible_impl {
BOOST_STATIC_CONSTANT(bool, value = (
boost::detail::is_copy_constructible_impl2<
boost::is_base_and_derived<boost::noncopyable, T>::value,
T
>::value
));
};
} // namespace detail
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_copy_constructible,T,::boost::detail::is_copy_constructible_impl<T>::value)
BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_copy_constructible,void,false)
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_copy_constructible,void const,false)
BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_copy_constructible,void const volatile,false)
BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_copy_constructible,void volatile,false)
#endif
} // namespace boost
#include <boost/type_traits/detail/bool_trait_undef.hpp>
#endif // BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
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