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307 lines
9.8 KiB
C++
307 lines
9.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// type_traits
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// XFAIL: apple-clang-6.0
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// The Apple-6 compiler gets is_constructible<void ()> wrong.
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// template <class T, class... Args>
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// struct is_constructible;
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// MODULES_DEFINES: _LIBCPP_TESTING_FALLBACK_IS_CONSTRUCTIBLE
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#define _LIBCPP_TESTING_FALLBACK_IS_CONSTRUCTIBLE
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#include <type_traits>
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#include "test_macros.h"
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#if TEST_STD_VER >= 11 && defined(_LIBCPP_VERSION)
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#define LIBCPP11_STATIC_ASSERT(...) static_assert(__VA_ARGS__)
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#else
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#define LIBCPP11_STATIC_ASSERT(...) ((void)0)
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#endif
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struct A
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{
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explicit A(int);
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A(int, double);
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A(int, long, double);
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#if TEST_STD_VER >= 11
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private:
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#endif
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A(char);
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};
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struct Base {};
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struct Derived : public Base {};
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class Abstract
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{
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virtual void foo() = 0;
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};
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class AbstractDestructor
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{
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virtual ~AbstractDestructor() = 0;
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};
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struct PrivateDtor {
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PrivateDtor(int) {}
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private:
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~PrivateDtor() {}
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};
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struct S {
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template <class T>
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#if TEST_STD_VER >= 11
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explicit
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#endif
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operator T () const;
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};
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template <class To>
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struct ImplicitTo {
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operator To();
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};
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#if TEST_STD_VER >= 11
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template <class To>
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struct ExplicitTo {
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explicit operator To ();
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};
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#endif
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template <class T>
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void test_is_constructible()
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{
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static_assert( (std::is_constructible<T>::value), "");
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LIBCPP11_STATIC_ASSERT((std::__libcpp_is_constructible<T>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert( std::is_constructible_v<T>, "");
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#endif
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}
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template <class T, class A0>
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void test_is_constructible()
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{
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static_assert(( std::is_constructible<T, A0>::value), "");
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LIBCPP11_STATIC_ASSERT((std::__libcpp_is_constructible<T, A0>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert(( std::is_constructible_v<T, A0>), "");
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#endif
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}
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template <class T, class A0, class A1>
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void test_is_constructible()
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{
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static_assert(( std::is_constructible<T, A0, A1>::value), "");
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LIBCPP11_STATIC_ASSERT((std::__libcpp_is_constructible<T, A0, A1>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert(( std::is_constructible_v<T, A0, A1>), "");
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#endif
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}
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template <class T, class A0, class A1, class A2>
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void test_is_constructible()
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{
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static_assert(( std::is_constructible<T, A0, A1, A2>::value), "");
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LIBCPP11_STATIC_ASSERT((std::__libcpp_is_constructible<T, A0, A1, A2>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert(( std::is_constructible_v<T, A0, A1, A2>), "");
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#endif
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}
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template <class T>
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void test_is_not_constructible()
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{
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static_assert((!std::is_constructible<T>::value), "");
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LIBCPP11_STATIC_ASSERT((!std::__libcpp_is_constructible<T>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert((!std::is_constructible_v<T>), "");
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#endif
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}
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template <class T, class A0>
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void test_is_not_constructible()
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{
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static_assert((!std::is_constructible<T, A0>::value), "");
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LIBCPP11_STATIC_ASSERT((!std::__libcpp_is_constructible<T, A0>::type::value), "");
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#if TEST_STD_VER > 14
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static_assert((!std::is_constructible_v<T, A0>), "");
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#endif
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}
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#if TEST_STD_VER >= 11
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template <class T = int, class = decltype(static_cast<T&&>(std::declval<double&>()))>
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constexpr bool clang_disallows_valid_static_cast_test(int) { return false; };
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constexpr bool clang_disallows_valid_static_cast_test(long) { return true; }
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static constexpr bool clang_disallows_valid_static_cast_bug =
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clang_disallows_valid_static_cast_test(0);
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#endif
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int main(int, char**)
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{
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typedef Base B;
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typedef Derived D;
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test_is_constructible<int> ();
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test_is_constructible<int, const int> ();
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test_is_constructible<A, int> ();
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test_is_constructible<A, int, double> ();
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test_is_constructible<A, int, long, double> ();
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test_is_constructible<int&, int&> ();
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test_is_not_constructible<A> ();
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#if TEST_STD_VER >= 11
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test_is_not_constructible<A, char> ();
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#else
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test_is_constructible<A, char> ();
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#endif
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test_is_not_constructible<A, void> ();
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test_is_not_constructible<int, void()>();
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test_is_not_constructible<int, void(&)()>();
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test_is_not_constructible<int, void() const>();
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test_is_not_constructible<int&, void>();
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test_is_not_constructible<int&, void()>();
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test_is_not_constructible<int&, void() const>();
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test_is_not_constructible<int&, void(&)()>();
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test_is_not_constructible<void> ();
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test_is_not_constructible<const void> (); // LWG 2738
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test_is_not_constructible<volatile void> ();
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test_is_not_constructible<const volatile void> ();
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test_is_not_constructible<int&> ();
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test_is_not_constructible<Abstract> ();
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test_is_not_constructible<AbstractDestructor> ();
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test_is_constructible<int, S>();
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test_is_not_constructible<int&, S>();
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test_is_constructible<void(&)(), void(&)()>();
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test_is_constructible<void(&)(), void()>();
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#if TEST_STD_VER >= 11
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test_is_constructible<void(&&)(), void(&&)()>();
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test_is_constructible<void(&&)(), void()>();
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test_is_constructible<void(&&)(), void(&)()>();
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#endif
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#if TEST_STD_VER >= 11
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test_is_constructible<int const&, int>();
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test_is_constructible<int const&, int&&>();
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test_is_constructible<int&&, double&>();
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test_is_constructible<void(&)(), void(&&)()>();
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test_is_not_constructible<int&, int>();
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test_is_not_constructible<int&, int const&>();
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test_is_not_constructible<int&, int&&>();
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test_is_constructible<int&&, int>();
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test_is_constructible<int&&, int&&>();
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test_is_not_constructible<int&&, int&>();
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test_is_not_constructible<int&&, int const&&>();
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test_is_constructible<Base, Derived>();
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test_is_constructible<Base&, Derived&>();
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test_is_not_constructible<Derived&, Base&>();
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test_is_constructible<Base const&, Derived const&>();
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test_is_not_constructible<Derived const&, Base const&>();
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test_is_not_constructible<Derived const&, Base>();
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test_is_constructible<Base&&, Derived>();
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test_is_constructible<Base&&, Derived&&>();
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test_is_not_constructible<Derived&&, Base&&>();
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test_is_not_constructible<Derived&&, Base>();
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// test that T must also be destructible
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test_is_constructible<PrivateDtor&, PrivateDtor&>();
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test_is_not_constructible<PrivateDtor, int>();
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test_is_not_constructible<void() const, void() const>();
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test_is_not_constructible<void() const, void*>();
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test_is_constructible<int&, ImplicitTo<int&>>();
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test_is_constructible<const int&, ImplicitTo<int&&>>();
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test_is_constructible<int&&, ImplicitTo<int&&>>();
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test_is_constructible<const int&, ImplicitTo<int>>();
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test_is_not_constructible<B&&, B&>();
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test_is_not_constructible<B&&, D&>();
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test_is_constructible<B&&, ImplicitTo<D&&>>();
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test_is_constructible<B&&, ImplicitTo<D&&>&>();
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test_is_constructible<int&&, double&>();
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test_is_constructible<const int&, ImplicitTo<int&>&>();
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test_is_constructible<const int&, ImplicitTo<int&>>();
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test_is_constructible<const int&, ExplicitTo<int&>&>();
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test_is_constructible<const int&, ExplicitTo<int&>>();
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test_is_constructible<const int&, ExplicitTo<int&>&>();
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test_is_constructible<const int&, ExplicitTo<int&>>();
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test_is_constructible<int&, ExplicitTo<int&>>();
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test_is_constructible<const int&, ExplicitTo<int&&>>();
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// Binding through reference-compatible type is required to perform
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// direct-initialization as described in [over.match.ref] p. 1 b. 1:
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test_is_constructible<int&, ExplicitTo<int&>>();
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test_is_constructible<const int&, ExplicitTo<int&&>>();
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static_assert(std::is_constructible<int&&, ExplicitTo<int&&>>::value, "");
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#ifdef __clang__
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#if defined(CLANG_TEST_VER) && CLANG_TEST_VER < 400
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static_assert(clang_disallows_valid_static_cast_bug, "bug still exists");
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#endif
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// FIXME Clang disallows this construction because it thinks that
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// 'static_cast<int&&>(declval<ExplicitTo<int&&>>())' is ill-formed.
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LIBCPP_STATIC_ASSERT(
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clang_disallows_valid_static_cast_bug !=
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std::__libcpp_is_constructible<int&&, ExplicitTo<int&&>>::value, "");
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((void)clang_disallows_valid_static_cast_bug); // Prevent unused warning
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#else
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static_assert(clang_disallows_valid_static_cast_bug == false, "");
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LIBCPP_STATIC_ASSERT(std::__libcpp_is_constructible<int&&, ExplicitTo<int&&>>::value, "");
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#endif
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#ifdef __clang__
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// FIXME Clang and GCC disagree on the validity of this expression.
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test_is_constructible<const int&, ExplicitTo<int>>();
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static_assert(std::is_constructible<int&&, ExplicitTo<int>>::value, "");
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LIBCPP_STATIC_ASSERT(
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clang_disallows_valid_static_cast_bug !=
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std::__libcpp_is_constructible<int&&, ExplicitTo<int>>::value, "");
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#else
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test_is_not_constructible<const int&, ExplicitTo<int>>();
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test_is_not_constructible<int&&, ExplicitTo<int>>();
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#endif
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// Binding through temporary behaves like copy-initialization,
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// see [dcl.init.ref] p. 5, very last sub-bullet:
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test_is_not_constructible<const int&, ExplicitTo<double&&>>();
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test_is_not_constructible<int&&, ExplicitTo<double&&>>();
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// TODO: Remove this workaround once Clang <= 3.7 are no longer used regularly.
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// In those compiler versions the __is_constructible builtin gives the wrong
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// results for abominable function types.
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#if (defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER < 703) \
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|| (defined(TEST_CLANG_VER) && TEST_CLANG_VER < 308)
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#define WORKAROUND_CLANG_BUG
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#endif
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#if !defined(WORKAROUND_CLANG_BUG)
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test_is_not_constructible<void()>();
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test_is_not_constructible<void() const> ();
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test_is_not_constructible<void() volatile> ();
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test_is_not_constructible<void() &> ();
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test_is_not_constructible<void() &&> ();
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#endif
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#endif // TEST_STD_VER >= 11
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return 0;
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}
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