text: //===----------------------------------------------------------------------===//
  //
  // 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
  
  // pointer_to_unary_function
  
  #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**)
  {
      typedef std::pointer_to_unary_function<int, double> F;
      static_assert((std::is_base_of<std::unary_function<int, double>, F>::value), "");
      const F f(unary_f);
      assert(f(36) == -35.5);
  
    return 0;
  }
  