forked from boostorg/variant2
99 lines
2.4 KiB
C++
99 lines
2.4 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/core/lightweight_test.hpp>
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using namespace boost::variant2;
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struct F1
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{
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template<class T1> T1 operator()( T1 t1 ) const
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{
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return t1;
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}
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};
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struct F2
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{
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template<class T1, class T2> auto operator()( T1 t1, T2 t2 ) const -> decltype( t1 + t2 )
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{
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return t1 + t2;
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}
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};
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struct F3
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{
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template<class T1, class T2, class T3> auto operator()( T1 t1, T2 t2, T3 t3 ) const -> decltype( t1 + t2 + t3 )
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{
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return t1 + t2 + t3;
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}
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};
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struct F4
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{
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template<class T1, class T2, class T3, class T4> auto operator()( T1 t1, T2 t2, T3 t3, T4 t4 ) const -> decltype( t1 + t2 + t3 + t4 )
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{
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return t1 + t2 + t3 + t4;
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}
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};
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int main()
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{
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{
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BOOST_TEST_EQ( (visit<int>( []{ return 3.14f; } )), 3 );
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}
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{
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variant<int, float> v( 1 );
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BOOST_TEST_EQ( visit<int>( F1(), v ), 1 );
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BOOST_TEST_EQ( visit<float>( F1(), v ), 1.0f );
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}
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{
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variant<int, float> const v( 3.14f );
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BOOST_TEST_EQ( visit<int>( F1(), v ), 3 );
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BOOST_TEST_EQ( visit<float>( F1(), v ), 3.14f );
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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>( F2(), v1, v2 ), 4 );
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BOOST_TEST_EQ( visit<float>( F2(), v1, v2 ), 1 + 3.14f );
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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>( F3(), v1, v2, v3 ), 10 );
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BOOST_TEST_EQ( visit<float>( F3(), v1, v2, v3 ), static_cast<float>( 1 + 3.14f + 6.28 ) );
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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>( F4(), v1, v2, v3, v4 ), 10 + 'A' );
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BOOST_TEST_EQ( visit<float>( F4(), v1, v2, v3, v4 ), static_cast<float>( 1 + 3.14f + 6.28 + 'A' ) );
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}
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return boost::report_errors();
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}
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