| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <functional> |
| |
| // template<Returnable R, class T, CopyConstructible... Args> |
| // unspecified mem_fn(R (T::* pm)(Args...)); |
| |
| #include <functional> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct A |
| { |
| TEST_CONSTEXPR_CXX14 char test0() {return 'a';} |
| TEST_CONSTEXPR_CXX14 char test1(int) {return 'b';} |
| TEST_CONSTEXPR_CXX14 char test2(int, double) {return 'c';} |
| }; |
| |
| template <class F> |
| TEST_CONSTEXPR_CXX20 bool |
| test0(F f) |
| { |
| { |
| A a; |
| assert(f(a) == 'a'); |
| A* ap = &a; |
| assert(f(ap) == 'a'); |
| const F& cf = f; |
| assert(cf(ap) == 'a'); |
| } |
| return true; |
| } |
| |
| template <class F> |
| TEST_CONSTEXPR_CXX20 bool |
| test1(F f) |
| { |
| { |
| A a; |
| assert(f(a, 1) == 'b'); |
| A* ap = &a; |
| assert(f(ap, 2) == 'b'); |
| const F& cf = f; |
| assert(cf(ap, 2) == 'b'); |
| } |
| return true; |
| } |
| |
| template <class F> |
| TEST_CONSTEXPR_CXX20 bool |
| test2(F f) |
| { |
| { |
| A a; |
| assert(f(a, 1, 2) == 'c'); |
| A* ap = &a; |
| assert(f(ap, 2, 3.5) == 'c'); |
| const F& cf = f; |
| assert(cf(ap, 2, 3.5) == 'c'); |
| } |
| return true; |
| } |
| |
| int main(int, char**) |
| { |
| test0(std::mem_fn(&A::test0)); |
| test1(std::mem_fn(&A::test1)); |
| test2(std::mem_fn(&A::test2)); |
| #if TEST_STD_VER >= 11 |
| static_assert((noexcept(std::mem_fn(&A::test0))), ""); // LWG#2489 |
| #endif |
| |
| #if TEST_STD_VER >= 20 |
| static_assert(test0(std::mem_fn(&A::test0))); |
| static_assert(test1(std::mem_fn(&A::test1))); |
| static_assert(test2(std::mem_fn(&A::test2))); |
| #endif |
| |
| return 0; |
| } |