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