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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;
- #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
- struct X1
- {
- X1() {}
- X1(X1 const&) {}
- X1(X1&&) {}
- };
- inline bool operator==( X1, X1 ) { return true; }
- STATIC_ASSERT( !std::is_nothrow_default_constructible<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_constructible<X1>::value );
- STATIC_ASSERT( !std::is_nothrow_move_constructible<X1>::value );
- struct X2
- {
- X2() {}
- X2(X2 const&) {}
- X2(X2&&) {}
- };
- inline bool operator==( X2, X2 ) { return true; }
- STATIC_ASSERT( !std::is_nothrow_default_constructible<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_copy_constructible<X2>::value );
- STATIC_ASSERT( !std::is_nothrow_move_constructible<X2>::value );
- struct Y
- {
- Y( Y const& ) = delete;
- };
- template<class V> static void test( V const & v )
- {
- V v2( v );
- BOOST_TEST_EQ( v.index(), v2.index() );
- BOOST_TEST( v == v2 );
- }
- int main()
- {
- test( variant<int>() );
- test( variant<int>(1) );
- test( variant<int const>() );
- test( variant<int const>(1) );
- test( variant<int, float>() );
- test( variant<int, float>(1) );
- test( variant<int, float>(3.14f) );
- test( variant<int const, float const>() );
- test( variant<int const, float const>(1) );
- test( variant<int const, float const>(3.14f) );
- test( variant<std::string>() );
- test( variant<std::string>("test") );
- test( variant<std::string const>() );
- test( variant<std::string const>("test") );
- test( variant<int, float, std::string>() );
- test( variant<int, float, std::string>(1) );
- test( variant<int, float, std::string>(3.14f) );
- test( variant<int, float, std::string>("test") );
- test( variant<int, int>() );
- test( variant<int, int, float>() );
- test( variant<int, int, float>(3.14f) );
- test( variant<int, int, float, float>() );
- test( variant<int, int, float, float, std::string>("test") );
- test( variant<std::string, std::string, float>() );
- test( variant<X1 const>() );
- test( variant<X1, X2>() );
- test( variant<X1, X2, int>() );
- test( variant<X1, X2, X2>() );
- test( variant<X1, X1, X2, X2>() );
- {
- variant<X1, X2> v;
- v.emplace<X2>();
- test( v );
- }
- {
- variant<X1, X1, X2> v;
- v.emplace<X2>();
- test( v );
- }
- {
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_constructible<variant<int>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_constructible<variant<int const>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_constructible<variant<int, int>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_constructible<variant<int, float>>));
- BOOST_TEST_TRAIT_TRUE((std::is_nothrow_copy_constructible<variant<int, int, float, float>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<X1>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<X1, int>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<X1, int, float>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<int, X1>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<int, int, X1>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<X1, X2>>));
- BOOST_TEST_TRAIT_FALSE((std::is_nothrow_copy_constructible<variant<X1, X2, int, int>>));
- BOOST_TEST_TRAIT_TRUE((std::is_copy_constructible<variant<X1, X2>>));
- #if !BOOST_WORKAROUND( BOOST_MSVC, <= 1910 )
- BOOST_TEST_TRAIT_FALSE((std::is_copy_constructible<variant<int, float, Y>>));
- #endif
- }
- return boost::report_errors();
- }
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