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//===----------------------------------------------------------------------===//
//
// 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;
}
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