ceph/src/boost/libs/contract/test/call_if/true_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 true 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
  16 boost::contract::test::detail::oteststream out;
  17
  18 struct eq {
  19     typedef void result_type; // Test void result type.
  20
  21     template<typename L, typename R>
  22     result_type operator()(L left, R right) const {
  23         out << (left == right) << std::endl; // Requires operator==.
  24     }
  25 };
  26
  27 struct x {}; // Doest not have operator==.
  28
  29 int main() {
  30     std::ostringstream ok;
  31     x x1, x2;;
  32
  33     out.str("");
  34     boost::contract::call_if<boost::has_equal_to<int> >(
  35         boost::bind(eq(), 123, 456) // False.
  36     ); // Test no else (not called).
  37     ok.str(""); ok << false << std::endl;
  38     BOOST_TEST(out.eq(ok.str()));
  39
  40     out.str("");
  41     boost::contract::call_if<boost::has_equal_to<int> >(
  42         boost::bind(eq(), 123, 123) // True.
  43     ).else_(
  44         [] { return false; }
  45     ); // Test else (not called).
  46     ok.str(""); ok << true << std::endl;
  47     BOOST_TEST(out.eq(ok.str()));
  48
  49     out.str("");
  50     // Test "..._c".
  51     boost::contract::call_if_c<boost::has_equal_to<int>::value>(
  52         boost::bind(eq(), 123, 123) // True.
  53     ).else_( // Test else (not called).
  54         boost::bind(eq(), x1, x2) // Compiler-error... but not called.
  55     );
  56     ok.str(""); ok << true << std::endl;
  57     BOOST_TEST(out.eq(ok.str()));
  58
  59     return boost::report_errors();
  60 }
  61