ceph/src/boost/libs/contract/test/call_if/false_void.cpp

   1
   2 // Copyright (C) 2008-2018 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0 (see accompanying
   4 // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
   5 // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
   6
   7 // Test call_if with false condition and void result type.
   8
   9 #include "../detail/oteststream.hpp"
  10 #include <boost/contract/call_if.hpp>
  11 #include <boost/bind.hpp>
  12 #include <boost/type_traits/has_equal_to.hpp>
  13 #include <boost/detail/lightweight_test.hpp>
  14 #include <sstream>
  15 #include <ios>
  16
  17 boost::contract::test::detail::oteststream out;
  18
  19 struct eq {
  20     typedef void result_type; // Test void result type.
  21
  22     template<typename L, typename R>
  23     result_type operator()(L left, R right) const {
  24         out << (left == right) << std::endl; // Requires operator==.
  25     }
  26 };
  27
  28 struct x {}; // Doest not have operator==.
  29
  30 int main() {
  31     std::ostringstream ok;
  32     ok << std::boolalpha;
  33     out << std::boolalpha;
  34     x x1, x2;;
  35
  36     out.str("");
  37     boost::contract::call_if<boost::has_equal_to<x> >(
  38         boost::bind(eq(), x1, x2) // Compiler-error... but not called.
  39     ); // Test no else.
  40     ok.str("");
  41     BOOST_TEST(out.eq(ok.str()));
  42
  43     out.str("");
  44     // Test "..._c".
  45     boost::contract::call_if_c<boost::has_equal_to<x>::value>(
  46         boost::bind(eq(), x1, x2) // Compiler-error...but not called.
  47     ).else_(
  48         [] { out << true << std::endl; } // Test else.
  49     );
  50     ok.str(""); ok << true << std::endl;
  51     BOOST_TEST(out.eq(ok.str()));
  52
  53     return boost::report_errors();
  54 }
  55