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3rdparty/boost_1_81_0/libs/parameter/test/maybe.cpp 1001 Bytes
73ef4ff3   Hu Chunming   提交三方库
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  // Copyright Daniel Wallin 2006.
  // 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/parameter/name.hpp>
  
  namespace test {
  
      BOOST_PARAMETER_NAME(kw)
      BOOST_PARAMETER_NAME(unused)
  
      template <typename Args>
      int f(Args const& args)
      {
          return args[test::_kw | 1.f];
      }
  } // namespace test
  
  #include <boost/parameter/aux_/maybe.hpp>
  #include <boost/core/lightweight_test.hpp>
  
  int main()
  {
      BOOST_TEST_EQ(0, test::f((test::_kw = 0, test::_unused = 0)));
      BOOST_TEST_EQ(1, test::f(test::_unused = 0));
      BOOST_TEST_EQ(
          1
        , test::f((
              test::_kw = boost::parameter::aux::maybe<int>()
            , test::_unused = 0
          ))
      );
      BOOST_TEST_EQ(
          2
        , test::f((
              test::_kw = boost::parameter::aux::maybe<int>(2)
            , test::_unused = 0
          ))
      );
      return boost::report_errors();
  }