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3rdparty/boost_1_81_0/libs/hof/example/pointfree.cpp 1.31 KB
73ef4ff3   Hu Chunming   提交三方库
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  /*=============================================================================
      Copyright (c) 2017 Paul Fultz II
      pointfree.cpp
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  ==============================================================================*/
  /*=============================================================================
      Copyright (c) 2016 Paul Fultz II
      pointfree.cpp
      Distributed under the Boost Software License, Version 1.0. (See accompanying
      file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  ==============================================================================*/
  
  #include "example.h"
  
  using namespace boost::hof;
  
  BOOST_HOF_STATIC_FUNCTION(simple_print) = BOOST_HOF_LIFT(std::ref(std::cout) << _);
  BOOST_HOF_STATIC_FUNCTION(print) = proj(simple_print);
  BOOST_HOF_STATIC_FUNCTION(print_lines) = proj(flow(simple_print, _ << std::integral_constant<char, '\n'>{}));
  BOOST_HOF_STATIC_FUNCTION(max) = fold(BOOST_HOF_LIFT(std::max));
  
  int main() 
  {
      simple_print("Hello\n");
      print("Hello", "World\n");
      print_lines("Hello", "World");
  
      auto n = max(1, 2, 4, 3); // Returns 4
      auto m = max(0.1, 0.2, 0.5, 0.4); // Returns 0.5
  
      print_lines(n, m);
  }