160 lines
4.6 KiB
C++
160 lines
4.6 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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#if defined(_MSC_VER)
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# pragma warning( disable: 4702 ) // unreachable code
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#endif
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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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int v;
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X1(): v(0) {}
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explicit X1(int v): v(v) {}
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X1(X1 const& r): v(r.v) {}
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X1(X1&& r): v(r.v) {}
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X1& operator=( X1 const& r ) { v = r.v; return *this; }
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X1& operator=( X1&& r ) { v = r.v; return *this; }
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};
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inline bool operator==( X1 const& a, X1 const& b ) { return a.v == b.v; }
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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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STATIC_ASSERT( !std::is_nothrow_copy_assignable<X1>::value );
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STATIC_ASSERT( !std::is_nothrow_move_assignable<X1>::value );
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struct X2
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{
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int v;
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X2(): v(0) {}
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explicit X2(int v): v(v) {}
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X2(X2 const& r): v(r.v) {}
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X2(X2&& r): v(r.v) {}
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X2& operator=( X2 const& r ) { v = r.v; return *this; }
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X2& operator=( X2&& r ) { v = r.v; return *this; }
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};
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inline bool operator==( X2 const& a, X2 const& b ) { return a.v == b.v; }
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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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STATIC_ASSERT( !std::is_nothrow_copy_assignable<X2>::value );
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STATIC_ASSERT( !std::is_nothrow_move_assignable<X2>::value );
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int main()
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{
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{
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variant<int, float> v1( 1 );
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variant<int> v2 = v1.subset<int>();
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BOOST_TEST( holds_alternative<int>( v2 ) );
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BOOST_TEST_EQ( get<int>( v1 ), get<int>( v2 ) );
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BOOST_TEST_THROWS( v1.subset<float>(), bad_variant_access );
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variant<int> v3 = std::move(v1).subset<int>();
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BOOST_TEST( holds_alternative<int>( v3 ) );
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BOOST_TEST_EQ( get<int>( v2 ), get<int>( v3 ) );
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BOOST_TEST_THROWS( std::move(v1).subset<float>(), bad_variant_access );
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}
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{
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variant<int, float> const v1( 1 );
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variant<int> v2 = v1.subset<int>();
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BOOST_TEST( holds_alternative<int>( v2 ) );
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BOOST_TEST_EQ( get<int>( v1 ), get<int>( v2 ) );
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BOOST_TEST_THROWS( v1.subset<float>(), bad_variant_access );
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variant<int> v3 = std::move(v1).subset<int>();
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BOOST_TEST( holds_alternative<int>( v3 ) );
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BOOST_TEST_EQ( get<int>( v2 ), get<int>( v3 ) );
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BOOST_TEST_THROWS( std::move(v1).subset<float>(), bad_variant_access );
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}
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{
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variant<int, float> v1( 1 );
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variant<int, float> v2 = v1.subset<int, float>();
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BOOST_TEST( holds_alternative<int>( v2 ) );
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BOOST_TEST_EQ( get<int>( v1 ), get<int>( v2 ) );
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variant<int, float> v3 = std::move(v1).subset<int, float>();
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BOOST_TEST( holds_alternative<int>( v3 ) );
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BOOST_TEST_EQ( get<int>( v2 ), get<int>( v3 ) );
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}
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{
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variant<int, float> v1( 1 );
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variant<float, int> v2 = v1.subset<float, int>();
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BOOST_TEST( holds_alternative<int>( v2 ) );
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BOOST_TEST_EQ( get<int>( v1 ), get<int>( v2 ) );
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variant<float, int> v3 = std::move(v1).subset<float, int>();
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BOOST_TEST( holds_alternative<int>( v3 ) );
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BOOST_TEST_EQ( get<int>( v2 ), get<int>( v3 ) );
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}
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{
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variant<int, float, std::string> v1( "s1" );
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variant<int, std::string> v2 = v1.subset<int, std::string>();
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BOOST_TEST( holds_alternative<std::string>( v2 ) );
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BOOST_TEST_EQ( get<std::string>( v1 ), get<std::string>( v2 ) );
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variant<float, std::string> v3 = std::move(v1).subset<float, std::string>();
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BOOST_TEST( holds_alternative<std::string>( v3 ) );
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BOOST_TEST_EQ( get<std::string>( v2 ), get<std::string>( v3 ) );
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}
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{
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variant<int, int, float, float, X1, X2> v1{ X1{1} };
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variant<X1, X2> v2 = v1.subset<X1, X2>();
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BOOST_TEST( holds_alternative<X1>( v2 ) );
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BOOST_TEST_EQ( get<X1>( v1 ).v, get<X1>( v2 ).v );
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variant<X1, X2> v3 = std::move( v1 ).subset<X1, X2>();
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BOOST_TEST( holds_alternative<X1>( v3 ) );
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BOOST_TEST_EQ( get<X1>( v2 ).v, get<X1>( v3 ).v );
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}
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return boost::report_errors();
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}
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