//===----------------------------------------------------------------------===//
//
// 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

// template <CopyConstructible Arg, Returnable Result>
// pointer_to_unary_function<Arg, Result>
// ptr_fun(Result (*f)(Arg));

#define _LIBCPP_DISABLE_DEPRECATION_WARNINGS

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

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

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

  return 0;
}