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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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