//  (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/detail/workaround.hpp>

#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40900)

#include <boost/type_traits/is_constructible.hpp>

#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1800)

namespace boost {

template <class T> struct is_copy_constructible : public boost::is_constructible<T, const T&> {};

template <> struct is_copy_constructible<void> : public false_type {};
template <> struct is_copy_constructible<void const> : public false_type {};
template <> struct is_copy_constructible<void const volatile> : public false_type {};
template <> struct is_copy_constructible<void volatile> : public false_type {};

} // namespace boost

#else
//
// Special version for VC12 which has a problem when a base class (such as non_copyable) has a deleted
// copy constructor.  In this case the compiler thinks there really is a copy-constructor and tries to
// instantiate the deleted member.  std::is_copy_constructible has the same issue (or at least returns
// an incorrect value, which just defers the issue into the users code) as well.  We can at least fix
// boost::non_copyable as a base class as a special case:
//
#include <boost/type_traits/is_noncopyable.hpp>

namespace boost {

namespace detail {

template <class T, bool b> struct is_copy_constructible_imp : public boost::is_constructible<T, const T&> {};
template <class T> struct is_copy_constructible_imp<T, true> : public false_type {};

}

template <class T> struct is_copy_constructible : public detail::is_copy_constructible_imp<T, is_noncopyable<T>::value> {};

template <> struct is_copy_constructible<void> : public false_type {};
template <> struct is_copy_constructible<void const> : public false_type {};
template <> struct is_copy_constructible<void const volatile> : public false_type {};
template <> struct is_copy_constructible<void volatile> : public false_type {};

} // namespace boost

#endif

#else

#include <boost/type_traits/detail/yes_no_type.hpp>
#include <boost/type_traits/is_noncopyable.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/is_rvalue_reference.hpp>
#include <boost/type_traits/declval.hpp>
#include <boost/type_traits/is_array.hpp>
#include <boost/type_traits/declval.hpp>

#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4181)
#endif

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);
    //                                                        ^
    //
    // MSVC 12.0 (Visual 2013) has problems when the copy constructor has been deleted. See:
    // https://connect.microsoft.com/VisualStudio/feedback/details/800328/std-is-copy-constructible-is-broken
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_INTEL_CXX_VERSION) && !(defined(BOOST_MSVC) && _MSC_VER == 1800)

#ifdef BOOST_NO_CXX11_DECLTYPE
    template <class T1>
    static boost::type_traits::yes_type
    test(const T1&, boost::mpl::int_<sizeof(T1(boost::declval<const T1&>()))>* = 0);
#else
    template <class T1>
    static boost::type_traits::yes_type
    test(const T1&, decltype(T1(boost::declval<const T1&>()))* = 0);
#endif

    static boost::type_traits::no_type
    test(...);
#else
    template <class T1>
    static boost::type_traits::no_type
    test(const 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 const>::type>()
                                                    )) == sizeof(boost::type_traits::yes_type)
                                            &&
                                            !boost::is_rvalue_reference<T>::value
                                            && !boost::is_array<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_noncopyable<T>::value,
                                            T
                                            >::value
                                        ));
};

} // namespace detail

template <class T> struct is_copy_constructible : public integral_constant<bool, ::boost::detail::is_copy_constructible_impl<T>::value> {};
template <> struct is_copy_constructible<void> : public false_type {};
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
template <> struct is_copy_constructible<void const> : public false_type {};
template <> struct is_copy_constructible<void volatile> : public false_type {};
template <> struct is_copy_constructible<void const volatile> : public false_type {};
#endif

} // namespace boost

#ifdef BOOST_MSVC
#pragma warning(pop)
#endif

#endif

#endif // BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
