forked from boostorg/type_traits
Add first draft of is_default_constructible trait.
This commit is contained in:
jzmaddock
61
include/boost/type_traits/is_default_constructible.hpp
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61
include/boost/type_traits/is_default_constructible.hpp
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// (C) Copyright John Maddock 2015.
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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_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
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#define BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/detail/workaround.hpp>
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#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
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#include <boost/type_traits/detail/yes_no_type.hpp>
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namespace boost{
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namespace detail{
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struct is_default_constructible_imp
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{
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template<typename _Tp, typename = decltype(_Tp())>
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static boost::type_traits::yes_type test(int);
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template<typename>
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static boost::type_traits::no_type test(...);
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};
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}
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template <class T> struct is_default_constructible : public integral_constant<bool, sizeof(detail::is_default_constructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>{};
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template <class T, std::size_t N> struct is_default_constructible<T[N]> : public is_default_constructible<T>{};
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template <class T> struct is_default_constructible<T[]> : public is_default_constructible<T>{};
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template <class T> struct is_default_constructible<T&> : public integral_constant<bool, false>{};
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template <class T> struct is_default_constructible<T&&> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void const> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void volatile> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void const volatile> : public integral_constant<bool, false>{};
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#else
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#include <boost/type_traits/has_trivial_constructor.hpp>
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namespace boost{
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// We don't know how to implement this:
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template <class T> struct is_default_constructible : public has_trivial_constructor<T>{};
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template <> struct is_default_constructible<void> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void const> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void volatile> : public integral_constant<bool, false>{};
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template <> struct is_default_constructible<void const volatile> : public integral_constant<bool, false>{};
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#endif
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} // namespace boost
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#endif // BOOST_TT_IS_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED
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204
test/is_default_constr_test.cpp
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204
test/is_default_constr_test.cpp
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// (C) Copyright John Maddock 2000.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include "test.hpp"
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#include "check_integral_constant.hpp"
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#ifdef TEST_STD
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# include <type_traits>
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#else
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# include <boost/type_traits/is_default_constructible.hpp>
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#endif
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class bug11324_base
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{
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public:
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bug11324_base & operator=(const bug11324_base&){ throw int(); }
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virtual ~bug11324_base() {}
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};
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class bug11324_derived : public bug11324_base
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{
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public:
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char data;
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explicit bug11324_derived(char arg) : data(arg) {}
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};
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#ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
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struct deleted_default_construct
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{
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deleted_default_construct() = delete;
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deleted_default_construct(char val) : member(val) {}
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char member;
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};
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#endif
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struct private_default_construct
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{
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private:
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private_default_construct();
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public:
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private_default_construct(char val) : member(val) {}
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char member;
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};
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TT_TEST_BEGIN(is_default_constructible)
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bool>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bool const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bool volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bool const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<signed char>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<signed char const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<signed char volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<signed char const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned char>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<char>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned char const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<char const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned char volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<char volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned char const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<char const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned short>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<short>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned short const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<short const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned short volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<short volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned short const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<short const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned int>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned int const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned int volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned int const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned long>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned long const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned long volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned long const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long const volatile>::value, true);
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#ifdef BOOST_HAS_LONG_LONG
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::ulong_long_type>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::long_long_type>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::ulong_long_type const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::long_long_type const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::ulong_long_type volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::long_long_type volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::ulong_long_type const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible< ::boost::long_long_type const volatile>::value, true);
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#endif
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#ifdef BOOST_HAS_MS_INT64
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int8>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int8>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int8 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int8 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int8 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int8 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int8 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int8 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int16>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int16>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int16 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int16 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int16 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int16 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int16 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int16 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int32>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int32>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int32 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int32 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int32 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int32 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int32 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int32 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int64>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int64>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int64 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int64 const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int64 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int64 volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<unsigned __int64 const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<__int64 const volatile>::value, true);
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#endif
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<float>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<float const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<float volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<float const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<double>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<double const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<double volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<double const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long double>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long double const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long double volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<long double const volatile>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<void*>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int*const>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<f1>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<f2>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<f3>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<mf1>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<mf2>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<mf3>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<mp>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<cmf>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<enum_UDT>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int&>::value, false);
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int&&>::value, false);
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#endif
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<const int&>::value, false);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int[2]>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int[3][2]>::value, true);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<int[2][4][5][6][3]>::value, true);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<UDT>::value, true, false);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<empty_UDT>::value, true, false);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<void>::value, false);
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// cases we would like to succeed but can't implement in the language:
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<empty_POD_UDT>::value, true, false);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<POD_UDT>::value, true, false);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<POD_union_UDT>::value, true, false);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<empty_POD_union_UDT>::value, true, false);
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BOOST_CHECK_SOFT_INTEGRAL_CONSTANT(::tt::is_default_constructible<nothrow_construct_UDT>::value, true, false);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<test_abc1>::value, false);
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<bug11324_derived>::value, false);
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#ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<deleted_default_construct>::value, false);
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#endif
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BOOST_CHECK_INTEGRAL_CONSTANT(::tt::is_default_constructible<private_default_construct>::value, false);
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TT_TEST_END
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