188 lines
7.0 KiB
Plaintext
188 lines
7.0 KiB
Plaintext
// (C) Copyright Antony Polukhin 2013.
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//
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (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/type_traits for most recent version including documentation.
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#ifndef BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
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#define BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40900)
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#include <boost/type_traits/is_constructible.hpp>
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#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1800)
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namespace boost {
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template <class T> struct is_copy_constructible : public boost::is_constructible<T, const T&>{};
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template <> struct is_copy_constructible<void> : public false_type{};
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template <> struct is_copy_constructible<void const> : public false_type{};
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template <> struct is_copy_constructible<void const volatile> : public false_type{};
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template <> struct is_copy_constructible<void volatile> : public false_type{};
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} // namespace boost
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#else
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//
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// Special version for VC12 which has a problem when a base class (such as non_copyable) has a deleted
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// copy constructor. In this case the compiler thinks there really is a copy-constructor and tries to
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// instantiate the deleted member. std::is_copy_constructible has the same issue (or at least returns
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// an incorrect value, which just defers the issue into the users code) as well. We can at least fix
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// boost::non_copyable as a base class as a special case:
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//
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/noncopyable.hpp>
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namespace boost {
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namespace detail
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{
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template <class T, bool b> struct is_copy_constructible_imp : public boost::is_constructible<T, const T&>{};
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template <class T> struct is_copy_constructible_imp<T, true> : public false_type{};
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}
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template <class T> struct is_copy_constructible : public detail::is_copy_constructible_imp<T, is_base_and_derived<boost::noncopyable, T>::value>{};
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template <> struct is_copy_constructible<void> : public false_type{};
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template <> struct is_copy_constructible<void const> : public false_type{};
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template <> struct is_copy_constructible<void const volatile> : public false_type{};
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template <> struct is_copy_constructible<void volatile> : public false_type{};
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} // namespace boost
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#endif
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#else
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#include <boost/type_traits/detail/yes_no_type.hpp>
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#include <boost/type_traits/is_base_and_derived.hpp>
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#include <boost/type_traits/add_reference.hpp>
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#include <boost/type_traits/is_rvalue_reference.hpp>
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#include <boost/type_traits/declval.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/declval.hpp>
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#include <boost/noncopyable.hpp>
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable:4181)
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#endif
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namespace boost {
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namespace detail{
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template <bool DerivedFromNoncopyable, class T>
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struct is_copy_constructible_impl2 {
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// Intel compiler has problems with SFINAE for copy constructors and deleted functions:
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//
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// error: function *function_name* cannot be referenced -- it is a deleted function
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// static boost::type_traits::yes_type test(T1&, decltype(T1(boost::declval<T1&>()))* = 0);
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// ^
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//
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// MSVC 12.0 (Visual 2013) has problems when the copy constructor has been deleted. See:
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// https://connect.microsoft.com/VisualStudio/feedback/details/800328/std-is-copy-constructible-is-broken
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#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_INTEL_CXX_VERSION) && !(defined(BOOST_MSVC) && _MSC_VER == 1800)
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#ifdef BOOST_NO_CXX11_DECLTYPE
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template <class T1>
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static boost::type_traits::yes_type test(const T1&, boost::mpl::int_<sizeof(T1(boost::declval<const T1&>()))>* = 0);
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#else
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template <class T1>
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static boost::type_traits::yes_type test(const T1&, decltype(T1(boost::declval<const T1&>()))* = 0);
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#endif
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static boost::type_traits::no_type test(...);
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#else
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template <class T1>
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static boost::type_traits::no_type test(const T1&, typename T1::boost_move_no_copy_constructor_or_assign* = 0);
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static boost::type_traits::yes_type test(...);
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#endif
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// If you see errors like this:
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//
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// `'T::T(const T&)' is private`
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// `boost/type_traits/is_copy_constructible.hpp:68:5: error: within this context`
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//
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// then you are trying to call that macro for a structure defined like that:
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//
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// struct T {
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// ...
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// private:
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// T(const T &);
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// ...
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// };
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//
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// To fix that you must modify your structure:
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//
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// // C++03 and C++11 version
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// struct T: private boost::noncopyable {
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// ...
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// private:
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// T(const T &);
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// ...
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// };
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//
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// // C++11 version
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// struct T {
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// ...
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// private:
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// T(const T &) = delete;
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// ...
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// };
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BOOST_STATIC_CONSTANT(bool, value = (
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sizeof(test(
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boost::declval<BOOST_DEDUCED_TYPENAME boost::add_reference<T const>::type>()
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)) == sizeof(boost::type_traits::yes_type)
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&&
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!boost::is_rvalue_reference<T>::value
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&& !boost::is_array<T>::value
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));
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};
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template <class T>
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struct is_copy_constructible_impl2<true, T> {
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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template <class T>
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struct is_copy_constructible_impl {
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BOOST_STATIC_CONSTANT(bool, value = (
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boost::detail::is_copy_constructible_impl2<
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boost::is_base_and_derived<boost::noncopyable, T>::value,
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T
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>::value
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));
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};
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} // namespace detail
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template <class T> struct is_copy_constructible : public integral_constant<bool, ::boost::detail::is_copy_constructible_impl<T>::value>{};
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template <> struct is_copy_constructible<void> : public false_type{};
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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template <> struct is_copy_constructible<void const> : public false_type{};
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template <> struct is_copy_constructible<void volatile> : public false_type{};
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template <> struct is_copy_constructible<void const volatile> : public false_type{};
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#endif
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} // namespace boost
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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#endif
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#endif // BOOST_TT_IS_COPY_CONSTRUCTIBLE_HPP_INCLUDED
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