//===----------------------------------------------------------------------===//
//
// 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 <CopyConstructible Arg, Returnable Result>
// pointer_to_unary_function<Arg, Result>
// ptr_fun(Result (*f)(Arg));
// UNSUPPORTED: c++98, c++03, c++11, c++14

#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS

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

#include "test_macros.h"

double unary_f(int i) {return 0.5 - i;}

int main(int, char**)
{
    assert(std::ptr_fun(unary_f)(36) == -35.5);

  return 0;
}