| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // type_traits |
| |
| // is_assignable |
| |
| #include <type_traits> |
| #include "test_macros.h" |
| |
| struct A |
| { |
| }; |
| |
| struct B |
| { |
| void operator=(A); |
| }; |
| |
| template <class T, class U> |
| void test_is_assignable() |
| { |
| static_assert(( std::is_assignable<T, U>::value), ""); |
| #if TEST_STD_VER > 14 |
| static_assert( std::is_assignable_v<T, U>, ""); |
| #endif |
| } |
| |
| template <class T, class U> |
| void test_is_not_assignable() |
| { |
| static_assert((!std::is_assignable<T, U>::value), ""); |
| #if TEST_STD_VER > 14 |
| static_assert( !std::is_assignable_v<T, U>, ""); |
| #endif |
| } |
| |
| struct D; |
| |
| #if TEST_STD_VER >= 11 |
| struct C |
| { |
| template <class U> |
| D operator,(U&&); |
| }; |
| |
| struct E |
| { |
| C operator=(int); |
| }; |
| #endif |
| |
| template <typename T> |
| struct X { T t; }; |
| |
| int main(int, char**) |
| { |
| test_is_assignable<int&, int&> (); |
| test_is_assignable<int&, int> (); |
| test_is_assignable<int&, double> (); |
| test_is_assignable<B, A> (); |
| test_is_assignable<void*&, void*> (); |
| |
| #if TEST_STD_VER >= 11 |
| test_is_assignable<E, int> (); |
| |
| test_is_not_assignable<int, int&> (); |
| test_is_not_assignable<int, int> (); |
| #endif |
| test_is_not_assignable<A, B> (); |
| test_is_not_assignable<void, const void> (); |
| test_is_not_assignable<const void, const void> (); |
| test_is_not_assignable<int(), int> (); |
| |
| // pointer to incomplete template type |
| test_is_assignable<X<D>*&, X<D>*> (); |
| |
| return 0; |
| } |