//===----------------------------------------------------------------------===//
//
// 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>
// REQUIRES: c++98 || c++03 || c++11 || c++14

// const_mem_fun_ref_t

#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS

#include <functional>
#include <type_traits>
#include <cassert>

struct A
{
    char a1() {return 5;}
    short a2(int i) {return short(i+1);}
    int a3() const {return 1;}
    double a4(unsigned i) const {return i-1;}
};

int main(int, char**)
{
    typedef std::const_mem_fun_ref_t<int, A> F;
    static_assert((std::is_base_of<std::unary_function<A, int>, F>::value), "");
    const F f(&A::a3);
    const A a = A();
    assert(f(a) == 1);

  return 0;
}