97 lines
2.2 KiB
C++
97 lines
2.2 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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#include <boost/variant2/variant.hpp>
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#include <boost/config.hpp>
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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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#if BOOST_WORKAROUND(BOOST_GCC, < 50000)
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# define STATIC_ASSERT_IF(...)
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#else
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# define STATIC_ASSERT_IF(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
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#endif
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int main()
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{
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{
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constexpr variant<int> v;
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STATIC_ASSERT( get<0>(v) == 0 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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}
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{
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constexpr variant<int> v( 1 );
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STATIC_ASSERT( get<0>(v) == 1 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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}
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{
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constexpr variant<int, float> v;
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STATIC_ASSERT( get<0>(v) == 0 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
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}
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{
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constexpr variant<int, float> v( 1 );
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STATIC_ASSERT( get<0>(v) == 1 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
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}
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{
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constexpr variant<int, float> v( 3.14f );
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STATIC_ASSERT( get<1>(v) == 3.14f );
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STATIC_ASSERT_IF( get_if<0>(&v) == nullptr );
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STATIC_ASSERT_IF( get_if<1>(&v) == &get<1>(v) );
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}
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{
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constexpr variant<int, float, float> v;
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STATIC_ASSERT( get<0>(v) == 0 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
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STATIC_ASSERT_IF( get_if<2>(&v) == nullptr );
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}
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{
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constexpr variant<int, float, float> v( 1 );
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STATIC_ASSERT( get<0>(v) == 1 );
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STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
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STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
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STATIC_ASSERT_IF( get_if<2>(&v) == nullptr );
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}
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{
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constexpr variant<int, int, float> v( 3.14f );
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STATIC_ASSERT( get<2>(v) == 3.14f );
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STATIC_ASSERT_IF( get_if<0>(&v) == nullptr );
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STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
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STATIC_ASSERT_IF( get_if<2>(&v) == &get<2>(v) );
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}
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}
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