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- // 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 STL equal_to with call_if.
- // C++17 warning from Boost.Bind.
- #define _SILENCE_CXX17_ADAPTOR_TYPEDEFS_DEPRECATION_WARNING
- #include "../detail/oteststream.hpp"
- #include <boost/contract/call_if.hpp>
- #include <boost/bind.hpp>
- #include <boost/type_traits/has_equal_to.hpp>
- #include <boost/detail/lightweight_test.hpp>
- #include <functional>
- #include <sstream>
- #include <ios>
- boost::contract::test::detail::oteststream out;
- template<typename T>
- struct void_equal_to {
- typedef void result_type; // Test void result type.
- void operator()(T const& left, T const& right) const {
- out << (left == right) << std::endl;
- }
- };
- struct x {}; // Doest not have operator==.
- int main() {
- std::ostringstream ok;
- ok << std::boolalpha;
- out << std::boolalpha;
- x x1, x2;;
- out.str("");
- out << // Test on true condition with non-void result type.
- boost::contract::call_if<boost::has_equal_to<int> >(
- boost::bind(std::equal_to<int>(), 123, 123) // True.
- ).else_(
- // Compiler-error... but not called.
- boost::bind(std::equal_to<x>(), x1, x2)
- )
- << std::endl;
- ok.str(""); ok << true << std::endl;
- BOOST_TEST(out.eq(ok.str()));
-
- out.str("");
- out << // Test on false condition with non-void result type.
- boost::contract::call_if<boost::has_equal_to<x> >(
- // Compiler-error... but not called.
- boost::bind(std::equal_to<x>(), x1, x2)
- ).else_([] { return true; })
- << std::endl;
- ok.str(""); ok << true << std::endl;
- BOOST_TEST(out.eq(ok.str()));
-
- out.str("");
- // Test on true condition void result type.
- boost::contract::call_if<boost::has_equal_to<int> >(
- boost::bind(void_equal_to<int>(), 123, 456) // False.
- ).else_(
- // Compiler-error... but not called.
- boost::bind(void_equal_to<x>(), x1, x1)
- );
- ok.str(""); ok << false << std::endl;
- BOOST_TEST(out.eq(ok.str()));
-
- out.str("");
- // Test on false condition with void result type.
- boost::contract::call_if<boost::has_equal_to<x> >(
- // Compiler-error... but not called.
- boost::bind(void_equal_to<x>(), x1, x1)
- ).else_(
- boost::bind(void_equal_to<int>(), 123, 456) // False.
- );
- ok.str(""); ok << false << std::endl;
- BOOST_TEST(out.eq(ok.str()));
- return boost::report_errors();
- }
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