127 lines
4.2 KiB
C++
127 lines
4.2 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: 4244 ) // conversion from float to int, possible loss of data
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#endif
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#include <boost/variant2/variant.hpp>
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#include <boost/mp11.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 <boost/config.hpp>
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#include <type_traits>
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#include <utility>
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#include <string>
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#include <cstdio>
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using namespace boost::variant2;
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using boost::mp11::mp_size_t;
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struct X
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{
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};
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struct F
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{
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mp_size_t<1> operator()( X& ) const;
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mp_size_t<2> operator()( X const& ) const;
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mp_size_t<3> operator()( X&& ) const;
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mp_size_t<4> operator()( X const&& ) const;
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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( 1 );
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BOOST_TEST_EQ( (visit( []( int x ){ return x; }, v )), 1 );
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visit( []( int x ){ BOOST_TEST_EQ( x, 1 ); }, v );
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visit( []( int x ){ BOOST_TEST_EQ( x, 1 ); }, std::move(v) );
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}
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{
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variant<int> const v( 2 );
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BOOST_TEST_EQ( (visit( []( int x ){ return x; }, v )), 2 );
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visit( []( int x ){ BOOST_TEST_EQ( x, 2 ); }, v );
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visit( []( int x ){ BOOST_TEST_EQ( x, 2 ); }, std::move(v) );
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}
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{
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variant<int const> v( 3 );
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BOOST_TEST_EQ( (visit( []( int x ){ return x; }, v )), 3 );
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visit( []( int x ){ BOOST_TEST_EQ( x, 3 ); }, v );
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visit( []( int x ){ BOOST_TEST_EQ( x, 3 ); }, std::move(v) );
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}
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{
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variant<int const> const v( 4 );
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BOOST_TEST_EQ( (visit( []( int x ){ return x; }, v )), 4 );
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visit( []( int x ){ BOOST_TEST_EQ( x, 4 ); }, v );
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visit( []( int x ){ BOOST_TEST_EQ( x, 4 ); }, std::move(v) );
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}
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{
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variant<int, float> v1( 1 );
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variant<int, float> const v2( 3.14f );
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BOOST_TEST_EQ( (visit( []( int x1, float x2 ){ return (int)(x1 * 1000) + (int)(x2 * 100); }, v1, v2 )), 1314 );
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visit( []( int x1, float x2 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); }, v1, v2 );
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visit( []( int x1, float x2 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); }, std::move(v1), std::move(v2) );
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}
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{
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variant<int, float, double> v1( 1 );
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variant<int, float, double> const v2( 3.14f );
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variant<int, float, double> v3( 6.28 );
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BOOST_TEST_EQ( (visit( []( int x1, float x2, double x3 ){ return (int)(x1 * 100) * 1000000 + (int)(x2 * 100) * 1000 + (int)(x3 * 100); }, v1, v2, v3 )), 100314628 );
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visit( []( int x1, float x2, double x3 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); BOOST_TEST_EQ( x3, 6.28 ); }, v1, v2, v3 );
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visit( []( int x1, float x2, double x3 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); BOOST_TEST_EQ( x3, 6.28 ); }, std::move(v1), std::move(v2), std::move(v3) );
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}
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{
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variant<int, float, double, char> v1( 1 );
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variant<int, float, double, char> const v2( 3.14f );
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variant<int, float, double, char> v3( 6.28 );
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variant<int, float, double, char> const v4( 'A' );
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BOOST_TEST_EQ( (visit( []( int x1, float x2, double x3, char x4 ){ return (long long)(x1 * 100) * 100000000 + (long long)(x2 * 100) * 100000 + (long long)(x3 * 10000) + (int)x4; }, v1, v2, v3, v4 )), 10031462800 + 'A' );
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visit( []( int x1, float x2, double x3, char x4 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); BOOST_TEST_EQ( x3, 6.28 ); BOOST_TEST_EQ( x4, 'A' ); }, v1, v2, v3, v4 );
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visit( []( int x1, float x2, double x3, char x4 ){ BOOST_TEST_EQ( x1, 1 ); BOOST_TEST_EQ( x2, 3.14f ); BOOST_TEST_EQ( x3, 6.28 ); BOOST_TEST_EQ( x4, 'A' ); }, std::move(v1), std::move(v2), std::move(v3), std::move(v4) );
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}
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{
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variant<X> v;
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variant<X> const cv;
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BOOST_TEST_EQ( decltype(visit(F{}, v))::value, 1 );
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BOOST_TEST_EQ( decltype(visit(F{}, cv))::value, 2 );
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BOOST_TEST_EQ( decltype(visit(F{}, std::move(v)))::value, 3 );
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#if !BOOST_WORKAROUND(BOOST_GCC, < 40900)
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// g++ 4.8 doesn't handle const&& particularly well
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BOOST_TEST_EQ( decltype(visit(F{}, std::move(cv)))::value, 4 );
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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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