1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 |
- // (C) Copyright John Maddock 2015.
- // 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_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
- #define BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
- #include <cstddef> // size_t
- #include <boost/type_traits/integral_constant.hpp>
- #include <boost/detail/workaround.hpp>
- #include <boost/type_traits/is_complete.hpp>
- #include <boost/static_assert.hpp>
- #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
- #include <boost/type_traits/is_abstract.hpp>
- #endif
- #if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ <= 5)) || (defined(BOOST_MSVC) && (BOOST_MSVC == 1800))
- #include <utility> // std::pair
- #endif
- #if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40500)
- #include <boost/type_traits/detail/yes_no_type.hpp>
- namespace boost{
- namespace detail{
- struct is_default_constructible_imp
- {
- template<typename _Tp, typename = decltype(_Tp())>
- static boost::type_traits::yes_type test(int);
- template<typename>
- static boost::type_traits::no_type test(...);
- };
- #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
- template<class T, bool b>
- struct is_default_constructible_abstract_filter
- {
- static const bool value = sizeof(is_default_constructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type);
- };
- template<class T>
- struct is_default_constructible_abstract_filter<T, true>
- {
- static const bool value = false;
- };
- #endif
- }
- #if BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
- template <class T> struct is_default_constructible : public integral_constant<bool, detail::is_default_constructible_abstract_filter<T, boost::is_abstract<T>::value>::value>
- {
- BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_default_constructible must be complete types");
- };
- #else
- template <class T> struct is_default_constructible : public integral_constant<bool, sizeof(boost::detail::is_default_constructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>
- {
- BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_default_constructible must be complete types");
- };
- #endif
- template <class T, std::size_t N> struct is_default_constructible<T[N]> : public is_default_constructible<T>{};
- template <class T> struct is_default_constructible<T[]> : public is_default_constructible<T>{};
- template <class T> struct is_default_constructible<T&> : public integral_constant<bool, false>{};
- #if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ <= 5))|| (defined(BOOST_MSVC) && (BOOST_MSVC == 1800))
- template <class T, class U> struct is_default_constructible<std::pair<T,U> > : public integral_constant<bool, is_default_constructible<T>::value && is_default_constructible<U>::value>{};
- #endif
- #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
- template <class T> struct is_default_constructible<T&&> : public integral_constant<bool, false>{};
- #endif
- template <> struct is_default_constructible<void> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void const> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void volatile> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void const volatile> : public integral_constant<bool, false>{};
- #else
- #include <boost/type_traits/is_pod.hpp>
- namespace boost{
- // We don't know how to implement this, note we can not use has_trivial_constructor here
- // because the correct implementation of that trait requires this one:
- template <class T> struct is_default_constructible : public is_pod<T>{};
- template <> struct is_default_constructible<void> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void const> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void volatile> : public integral_constant<bool, false>{};
- template <> struct is_default_constructible<void const volatile> : public integral_constant<bool, false>{};
- #endif
- } // namespace boost
- #endif // BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
|