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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
- {
- operator int() const { return 2; }
- };
- int main()
- {
- {
- variant<int> v( 1 );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 1 );
- }
- {
- variant<int> v( 'a' );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 'a' );
- }
- {
- variant<int> v( X{} );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 2 );
- }
- {
- variant<int const> v( 1 );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 1 );
- }
- {
- variant<int const> v( 'a' );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 'a' );
- }
- {
- variant<int const> v( X{} );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST_EQ( get<0>(v), 2 );
- }
- {
- variant<int, float, std::string> v( 1 );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST( holds_alternative<int>(v) );
- BOOST_TEST_EQ( get<0>(v), 1 );
- }
- {
- variant<int, float, std::string> v( 'a' );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST( holds_alternative<int>(v) );
- BOOST_TEST_EQ( get<0>(v), 'a' );
- }
- {
- variant<int, float, std::string> v( X{} );
- BOOST_TEST_EQ( v.index(), 0 );
- BOOST_TEST( holds_alternative<int>(v) );
- BOOST_TEST_EQ( get<0>(v), 2 );
- }
- {
- variant<int, float, std::string> v( 3.14f );
- BOOST_TEST_EQ( v.index(), 1 );
- BOOST_TEST( holds_alternative<float>(v) );
- BOOST_TEST_EQ( get<1>(v), 3.14f );
- }
- {
- variant<int, float, std::string> v( "text" );
- BOOST_TEST_EQ( v.index(), 2 );
- BOOST_TEST( holds_alternative<std::string>(v) );
- BOOST_TEST_EQ( get<2>(v), std::string("text") );
- }
- {
- variant<int, int, float, std::string> v( 3.14f );
- BOOST_TEST_EQ( v.index(), 2 );
- BOOST_TEST( holds_alternative<float>(v) );
- BOOST_TEST_EQ( get<2>(v), 3.14f );
- }
- {
- variant<int, int, float, std::string> v( "text" );
- BOOST_TEST_EQ( v.index(), 3 );
- BOOST_TEST( holds_alternative<std::string>(v) );
- BOOST_TEST_EQ( get<3>(v), std::string("text") );
- }
- return boost::report_errors();
- }
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