text: 
  // Copyright (C) 2008-2018 Lorenzo Caminiti
  // Distributed under the Boost Software License, Version 1.0 (see accompanying
  // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
  // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
  
  // Test specifying old, no pre, post, or except (same if not free func).
  
  #include "../detail/oteststream.hpp"
  #include <boost/contract/function.hpp>
  #include <boost/contract/check.hpp>
  #include <boost/detail/lightweight_test.hpp>
  #include <sstream>
  
  boost::contract::test::detail::oteststream out;
  
  void f() {
      boost::contract::check c = boost::contract::function()
          .old([] { out << "f::old" << std::endl; })
      ;
      out << "f::body" << std::endl;
  }
  
  int main() {
      std::ostringstream ok;
  
      out.str("");
      f();
      ok.str(""); ok
          #ifndef BOOST_CONTRACT_NO_OLDS
              << "f::old" << std::endl
          #endif
          << "f::body" << std::endl
      ;
      BOOST_TEST(out.eq(ok.str()));
  
      return boost::report_errors();
  }
  