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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 free function contracts.
- #include "../detail/oteststream.hpp"
- #include "../detail/counter.hpp"
- #include <boost/contract/function.hpp>
- #include <boost/contract/old.hpp>
- #include <boost/contract/assert.hpp>
- #include <boost/contract/check.hpp>
- #include <boost/preprocessor/control/iif.hpp>
- #include <boost/detail/lightweight_test.hpp>
- #include <sstream>
- boost::contract::test::detail::oteststream out;
- struct x_tag; typedef boost::contract::test::detail::counter<x_tag, int> x_type;
- struct y_tag; typedef boost::contract::test::detail::counter<y_tag, int> y_type;
- bool swap(x_type& x, y_type& y) {
- bool result;
- boost::contract::old_ptr<x_type> old_x =
- BOOST_CONTRACT_OLDOF(x_type::eval(x));
- boost::contract::old_ptr<y_type> old_y;
- boost::contract::check c = boost::contract::function()
- .precondition([&] {
- out << "swap::pre" << std::endl;
- BOOST_CONTRACT_ASSERT(x.value != y.value);
- })
- .old([&] {
- out << "swap::old" << std::endl;
- old_y = BOOST_CONTRACT_OLDOF(y_type::eval(y));
- })
- .postcondition([&] {
- out << "swap::post" << std::endl;
- BOOST_CONTRACT_ASSERT(x.value == old_y->value);
- BOOST_CONTRACT_ASSERT(y.value == old_x->value);
- BOOST_CONTRACT_ASSERT(result == (old_x->value != old_y->value));
- })
- ;
- out << "swap::body" << std::endl;
- if(x.value == y.value) return result = false;
- int save_x = x.value;
- x.value = y.value;
- y.value = save_x;
- return result = true;
- }
- int main() {
- std::ostringstream ok;
- {
- x_type x; x.value = 123;
- y_type y; y.value = 456;
- out.str("");
- bool r = swap(x, y);
- ok.str(""); ok
- #ifndef BOOST_CONTRACT_NO_PRECONDITIONS
- << "swap::pre" << std::endl
- #endif
- #ifndef BOOST_CONTRACT_NO_OLDS
- << "swap::old" << std::endl
- #endif
- << "swap::body" << std::endl
- #ifndef BOOST_CONTRACT_NO_POSTCONDITIONS
- << "swap::post" << std::endl
- #endif
- ;
- BOOST_TEST(out.eq(ok.str()));
-
- BOOST_TEST(r);
- BOOST_TEST_EQ(x.value, 456);
- BOOST_TEST_EQ(y.value, 123);
- }
- #ifndef BOOST_CONTRACT_NO_OLDS
- #define BOOST_CONTRACT_TEST_old 1u
- #else
- #define BOOST_CONTRACT_TEST_old 0u
- #endif
- BOOST_TEST_EQ(x_type::copies(), BOOST_CONTRACT_TEST_old);
- BOOST_TEST_EQ(x_type::evals(), BOOST_CONTRACT_TEST_old);
- BOOST_TEST_EQ(x_type::ctors(), x_type::dtors()); // No leak.
-
- BOOST_TEST_EQ(y_type::copies(), BOOST_CONTRACT_TEST_old);
- BOOST_TEST_EQ(y_type::evals(), BOOST_CONTRACT_TEST_old);
- BOOST_TEST_EQ(y_type::ctors(), y_type::dtors()); // No leak.
- #undef BOOST_CONTRACT_TEST_old
- return boost::report_errors();
- }
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