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Improve is_constructible.

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Add is_destructible.
Add tests.
This commit is contained in:
jzmaddock
2015-06-08 19:19:08 +01:00
parent 8ed541ac23
commit 4a16185e27
3 changed files with 143 additions and 2 deletions
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17
include/boost/type_traits/is_constructible.hpp
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@ -14,6 +14,7 @@
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
#include <boost/type_traits/is_destructible.hpp>
#include <boost/type_traits/detail/yes_no_type.hpp>
#include <boost/type_traits/detail/decl.hpp>
@ -25,14 +26,26 @@ namespace boost{
{
template<typename T, typename ...TheArgs, typename = decltype(T(tt_declval<TheArgs>()...))>
static boost::type_traits::yes_type test(int);
template<typename, typename>
template<typename, typename...>
static boost::type_traits::no_type test(...);
template<typename T, typename Arg, typename = decltype(::new T(tt_declval<Arg>()))>
static boost::type_traits::yes_type test1(int);
template<typename, typename>
static boost::type_traits::no_type test1(...);
template <typename T>
static boost::type_traits::yes_type ref_test(T);
template <typename T>
static boost::type_traits::no_type ref_test(...);
};
}
template <class T, class ...Args> struct is_constructible : public integral_constant<bool, sizeof(detail::is_constructible_imp::test<T, Args...>(0)) == sizeof(boost::type_traits::yes_type)>{};
template <class T, class Arg> struct is_constructible<T, Arg> : public integral_constant<bool, is_destructible<T>::value && sizeof(detail::is_constructible_imp::test1<T, Arg>(0)) == sizeof(boost::type_traits::yes_type)>{};
template <class Ref, class Arg> struct is_constructible<Ref&, Arg> : public integral_constant<bool, sizeof(detail::is_constructible_imp::ref_test<Ref&>(detail::tt_declval<Arg>())) == sizeof(boost::type_traits::yes_type)>{};
template <class Ref, class Arg> struct is_constructible<Ref&&, Arg> : public integral_constant<bool, sizeof(detail::is_constructible_imp::ref_test<Ref&&>(detail::tt_declval<Arg>())) == sizeof(boost::type_traits::yes_type)>{};
#else

49
include/boost/type_traits/is_destructible.hpp Normal file
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@ -0,0 +1,49 @@
// (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_DESTRUCTIBLE_HPP_INCLUDED
#define BOOST_TT_IS_DESTRUCTIBLE_HPP_INCLUDED
#include <boost/type_traits/integral_constant.hpp>
#include <boost/detail/workaround.hpp>
#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
#include <boost/type_traits/detail/yes_no_type.hpp>
#include <boost/type_traits/detail/decl.hpp>
namespace boost{
namespace detail{
struct is_destructible_imp
{
template<typename T, typename = decltype(tt_declval<T&>().~T())>
static boost::type_traits::yes_type test(int);
template<typename>
static boost::type_traits::no_type test(...);
};
}
template <class T> struct is_destructible : public integral_constant<bool, sizeof(detail::is_destructible_imp::test<T>(0)) == sizeof(boost::type_traits::yes_type)>{};
#else
#include <boost/type_traits/is_pod.hpp>
#include <boost/type_traits/is_class.hpp>
namespace boost{
// We don't know how to implement this:
template <class T> struct is_destructible : public integral_constant<bool, is_pod<T>::value || is_class<T>::value>{};
#endif
} // namespace boost
#endif // BOOST_TT_IS_DESTRUCTIBLE_HPP_INCLUDED

79
test/is_constructible_test.cpp Normal file
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@ -0,0 +1,79 @@
// (C) Copyright John Maddock 2000.
// 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)
#include "test.hpp"
#include "check_integral_constant.hpp"
#ifdef TEST_STD
# include <type_traits>
#else
# include <boost/type_traits/is_constructible.hpp>
#endif
struct non_copy_constructible
{
non_copy_constructible();
non_copy_constructible(int);
non_copy_constructible(double*, double*);
#ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
non_copy_constructible(const non_copy_constructible&) = delete;
#endif
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
non_copy_constructible(non_copy_constructible&&);
#endif
};
struct A { };
struct B : A { };
TT_TEST_BEGIN(is_constructible)
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B &&, A>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const &&, A>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const &&, A const>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B volatile &&, A>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B volatile &&, A volatile>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const volatile &&, A>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const volatile &&, A const>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const volatile &&, A volatile>::value) , false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const volatile &&, A const volatile>::value) , false);
#endif
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B&, A>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const &, A>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const &, A&>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<B const &, A const>::value), false);
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible>::value), true, false);
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, int>::value), true, false);
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, int const>::value), true, false);
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, int const&>::value), true, false);
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, non_copy_constructible>::value), true, false);
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
BOOST_CHECK_SOFT_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, double*, double*>::value), true, false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, double const*, double*>::value), false);
#endif
#ifndef BOOST_NO_CXX11_DELETED_FUNCTIONS
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<non_copy_constructible, const non_copy_constructible&>::value), false);
#endif
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int, const int>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int, const int&>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int*, const int&>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int*, const int*>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int*, int*>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int*, int[2]>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int*, int[]>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int(*)(int), int&>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int(*)(int), int(*)(int)>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int(&)(int), int(int)>::value), true);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int(int), int(int)>::value), false);
BOOST_CHECK_INTEGRAL_CONSTANT((::tt::is_constructible<int(int), int(&)(int)>::value), false);
TT_TEST_END