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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/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
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