solidity/test/libsolutil/LazyInit.cpp

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/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0
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#include <libsolutil/LazyInit.h>
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#include <boost/test/unit_test.hpp>
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#include <utility>
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namespace solidity::util::test
{
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namespace
{
template<typename T>
void assertInitCalled(LazyInit<T> lazyInit, bool target)
{
bool initCalled = false;
lazyInit.init([&]{
initCalled = true;
return T();
});
BOOST_REQUIRE_EQUAL(initCalled, target);
}
// Take ownership to ensure that it doesn't "mutate"
template<typename T>
void assertNotEmpty(LazyInit<T> _lazyInit) { assertInitCalled(std::move(_lazyInit), false); }
// Take ownership to ensure that it doesn't "mutate"
template<typename T>
void assertEmpty(LazyInit<T> _lazyInit) { assertInitCalled(std::move(_lazyInit), true); }
template<typename T>
T valueOf(LazyInit<T> _lazyInit)
{
return _lazyInit.init([&]{
BOOST_REQUIRE(false); // this should never be called
return T();
});
}
}
BOOST_AUTO_TEST_SUITE(LazyInitTests, *boost::unit_test::label("nooptions"))
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BOOST_AUTO_TEST_CASE(default_constructed_is_empty)
{
assertEmpty(LazyInit<int>());
assertEmpty(LazyInit<int const>());
}
BOOST_AUTO_TEST_CASE(initialized_is_not_empty)
{
LazyInit<int> lazyInit;
lazyInit.init([]{ return 12; });
assertNotEmpty(std::move(lazyInit));
}
BOOST_AUTO_TEST_CASE(init_returns_init_value)
{
LazyInit<int> lazyInit;
BOOST_CHECK_EQUAL(lazyInit.init([]{ return 12; }), 12);
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// A second call to init should not change the value
BOOST_CHECK_EQUAL(lazyInit.init([]{ return 42; }), 12);
}
BOOST_AUTO_TEST_CASE(moved_from_is_empty)
{
{
LazyInit<int> lazyInit;
{ [[maybe_unused]] auto pilfered = std::move(lazyInit); }
assertEmpty(std::move(lazyInit));
}
{
LazyInit<int> lazyInit;
lazyInit.init([]{ return 12; });
{ [[maybe_unused]] auto pilfered = std::move(lazyInit); }
assertEmpty(std::move(lazyInit));
}
}
BOOST_AUTO_TEST_CASE(move_constructed_has_same_value_as_original)
{
LazyInit<int> original;
original.init([]{ return 12; });
LazyInit<int> moveConstructed = std::move(original);
BOOST_CHECK_EQUAL(valueOf(std::move(moveConstructed)), 12);
}
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BOOST_AUTO_TEST_SUITE_END()
}