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