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3rdparty/boost_1_81_0/libs/hof/test/lambda.cpp 2.1 KB
73ef4ff3   Hu Chunming   提交三方库
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  /*=============================================================================
      Copyright (c) 2017 Paul Fultz II
      lambda.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 <boost/hof/lambda.hpp>
  #include <boost/hof/first_of.hpp>
  #include <boost/hof/partial.hpp>
  #include <boost/hof/infix.hpp>
  #include <boost/hof/pipable.hpp>
  #include <memory>
  #include "test.hpp"
  
  
  static constexpr auto add_one = BOOST_HOF_STATIC_LAMBDA(int x)
  {
      return x + 1;
  };
  
  template<class F>
  struct wrapper : F
  {
      BOOST_HOF_INHERIT_CONSTRUCTOR(wrapper, F)
  };
  
  template<class T>
  constexpr wrapper<T> wrap(T x)
  {
      return x;
  }
  
  BOOST_HOF_TEST_CASE()
  {
      BOOST_HOF_TEST_CHECK(3 == add_one(2));
  }
  
  BOOST_HOF_TEST_CASE()
  {
      constexpr auto add_one_again = add_one;
      BOOST_HOF_TEST_CHECK(3 == add_one_again(2));
  }
  
  BOOST_HOF_TEST_CASE()
  {
      constexpr auto add_one_again = wrap(add_one);
      BOOST_HOF_TEST_CHECK(3 == add_one_again(2));
  }
  
  namespace test_static {
  
  BOOST_HOF_STATIC_LAMBDA_FUNCTION(add_one) = [](int x)
  {
      return x + 1;
  };
  
  BOOST_HOF_TEST_CASE()
  {
      BOOST_HOF_TEST_CHECK(add_one(2) == 3);
  }
  
  BOOST_HOF_STATIC_LAMBDA_FUNCTION(sum_partial) = boost::hof::partial([](int x, int y)
  {
      return x + y;
  });
  
  BOOST_HOF_TEST_CASE()
  {
  #ifndef _MSC_VER
      STATIC_ASSERT_EMPTY(sum_partial);
  #endif
      BOOST_HOF_TEST_CHECK(3 == sum_partial(1, 2));
      BOOST_HOF_TEST_CHECK(3 == sum_partial(1)(2));
  }
  
  BOOST_HOF_STATIC_LAMBDA_FUNCTION(add_one_pipable) = boost::hof::pipable([](int x)
  {
      return x + 1;
  });
  
  BOOST_HOF_TEST_CASE()
  {
  #ifndef _MSC_VER
      STATIC_ASSERT_EMPTY(add_one_pipable);
  #endif
      BOOST_HOF_TEST_CHECK(3 == add_one_pipable(2));
      BOOST_HOF_TEST_CHECK(3 == (2 | add_one_pipable));
  }
  
  BOOST_HOF_STATIC_LAMBDA_FUNCTION(sum_infix) = boost::hof::infix([](int x, int y)
  {
      return x + y;
  });
  
  BOOST_HOF_TEST_CASE()
  {
  #ifndef _MSC_VER
      STATIC_ASSERT_EMPTY(sum_infix);
  #endif
      BOOST_HOF_TEST_CHECK(3 == (1 <sum_infix> 2));
  }
  
  }