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// (C) Copyright John Maddock 2017.
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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_COMPLETE_HPP_INCLUDED
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#define BOOST_TT_IS_COMPLETE_HPP_INCLUDED
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#include <boost/type_traits/declval.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/is_function.hpp>
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#include <boost/type_traits/detail/yes_no_type.hpp>
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#include <boost/config/workaround.hpp>
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/*
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* CAUTION:
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* ~~~~~~~~
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*
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* THIS TRAIT EXISTS SOLELY TO GENERATE HARD ERRORS WHEN A ANOTHER TRAIT
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* WHICH REQUIRES COMPLETE TYPES AS ARGUMENTS IS PASSED AN INCOMPLETE TYPE
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*
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* DO NOT MAKE GENERAL USE OF THIS TRAIT, AS THE COMPLETENESS OF A TYPE
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* VARIES ACROSS TRANSLATION UNITS AS WELL AS WITHIN A SINGLE UNIT.
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*
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*/
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namespace boost {
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//
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// We will undef this if the trait isn't fully functional:
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//
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#define BOOST_TT_HAS_WORKING_IS_COMPLETE
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#if !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_MSVC, <= 1900) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40600)
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namespace detail{
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template <unsigned N>
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struct ok_tag { double d; char c[N]; };
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template <class T>
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ok_tag<sizeof(T)> check_is_complete(int);
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template <class T>
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char check_is_complete(...);
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}
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template <class T> struct is_complete
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: public integral_constant<bool, ::boost::is_function<typename boost::remove_reference<T>::type>::value || (sizeof(boost::detail::check_is_complete<T>(0)) != sizeof(char))> {};
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#elif !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40500)
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namespace detail
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{
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template <class T>
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struct is_complete_imp
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{
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template <class U, class = decltype(sizeof(boost::declval< U >())) >
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static type_traits::yes_type check(U*);
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template <class U>
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static type_traits::no_type check(...);
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static const bool value = sizeof(check<T>(0)) == sizeof(type_traits::yes_type);
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};
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} // namespace detail
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template <class T>
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struct is_complete : boost::integral_constant<bool, ::boost::is_function<typename boost::remove_reference<T>::type>::value || ::boost::detail::is_complete_imp<T>::value>
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{};
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template <class T>
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struct is_complete<T&> : boost::is_complete<T> {};
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#else
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template <class T> struct is_complete
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: public boost::integral_constant<bool, true> {};
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#undef BOOST_TT_HAS_WORKING_IS_COMPLETE
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#endif
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} // namespace boost
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#endif // BOOST_TT_IS_COMPLETE_HPP_INCLUDED
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