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- // Copyright 2017 Peter Dimov.
- //
- // Distributed under the Boost Software License, Version 1.0.
- //
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- #include <boost/variant2/variant.hpp>
- #include <boost/core/lightweight_test.hpp>
- #include <boost/core/lightweight_test_trait.hpp>
- #include <type_traits>
- #include <utility>
- #include <string>
- using namespace boost::variant2;
- struct X
- {
- X();
- };
- struct Y
- {
- Y() = delete;
- };
- int main()
- {
- {
- variant<int> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- }
- {
- variant<int const> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- }
- {
- variant<int, float, std::string> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- }
- {
- variant<int, int, std::string> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 0 );
- }
- {
- variant<std::string> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), std::string() );
- }
- {
- variant<std::string const> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), std::string() );
- }
- {
- variant<std::string, int, float> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), std::string() );
- }
- {
- variant<std::string, std::string, float> v;
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), std::string() );
- }
- {
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int const>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int, X>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int, float, X>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int, int, X>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_default_constructible<variant<int, X, X>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_default_constructible<variant<X>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_default_constructible<variant<X, int>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_default_constructible<variant<X, int, float>>));
- BOOST_TEST_TRAIT_TRUE((std::is_default_constructible<variant<int, Y>>));
- BOOST_TEST_TRAIT_FALSE((std::is_default_constructible<variant<Y, int>>));
- }
- return boost::report_errors();
- }
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