contract/test/call_if/true_void.cpp

65 lines
1.9 KiB
C++

// 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 call_if with true condition and void result type.
#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 <sstream>
#include <ios>
boost::contract::test::detail::oteststream out;
struct eq {
typedef void result_type; // Test void result type.
template<typename L, typename R>
result_type operator()(L left, R right) const {
out << (left == right) << std::endl; // Requires operator==.
}
};
struct x {}; // Doest not have operator==.
int main() {
std::ostringstream ok;
ok << std::boolalpha;
out << std::boolalpha;
x x1, x2;;
out.str("");
boost::contract::call_if<boost::has_equal_to<int> >(
boost::bind(eq(), 123, 456) // False.
); // Test no else (not called).
ok.str(""); ok << false << std::endl;
BOOST_TEST(out.eq(ok.str()));
out.str("");
boost::contract::call_if<boost::has_equal_to<int> >(
boost::bind(eq(), 123, 123) // True.
).else_(
[] { return false; }
); // Test else (not called).
ok.str(""); ok << true << std::endl;
BOOST_TEST(out.eq(ok.str()));
out.str("");
// Test "..._c".
boost::contract::call_if_c<boost::has_equal_to<int>::value>(
boost::bind(eq(), 123, 123) // True.
).else_( // Test else (not called).
boost::bind(eq(), x1, x2) // Compiler-error... but not called.
);
ok.str(""); ok << true << std::endl;
BOOST_TEST(out.eq(ok.str()));
return boost::report_errors();
}