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- // Copyright 2017 Peter Dimov.
- //
- // Distributed under the Boost Software License, Version 1.0.
- //
- // See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt
- #include <boost/variant2/variant.hpp>
- #include <boost/config.hpp>
- using namespace boost::variant2;
- #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
- #if BOOST_WORKAROUND(BOOST_GCC, < 50000)
- # define STATIC_ASSERT_IF(...)
- #else
- # define STATIC_ASSERT_IF(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
- #endif
- int main()
- {
- {
- constexpr variant<int> v;
- STATIC_ASSERT( get<0>(v) == 0 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- }
- {
- constexpr variant<int> v( 1 );
- STATIC_ASSERT( get<0>(v) == 1 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- }
- {
- constexpr variant<int, float> v;
- STATIC_ASSERT( get<0>(v) == 0 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
- }
- {
- constexpr variant<int, float> v( 1 );
- STATIC_ASSERT( get<0>(v) == 1 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
- }
- {
- constexpr variant<int, float> v( 3.14f );
- STATIC_ASSERT( get<1>(v) == 3.14f );
- STATIC_ASSERT_IF( get_if<0>(&v) == nullptr );
- STATIC_ASSERT_IF( get_if<1>(&v) == &get<1>(v) );
- }
- {
- constexpr variant<int, float, float> v;
- STATIC_ASSERT( get<0>(v) == 0 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
- STATIC_ASSERT_IF( get_if<2>(&v) == nullptr );
- }
- {
- constexpr variant<int, float, float> v( 1 );
- STATIC_ASSERT( get<0>(v) == 1 );
- STATIC_ASSERT_IF( get_if<0>(&v) == &get<0>(v) );
- STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
- STATIC_ASSERT_IF( get_if<2>(&v) == nullptr );
- }
- {
- constexpr variant<int, int, float> v( 3.14f );
- STATIC_ASSERT( get<2>(v) == 3.14f );
- STATIC_ASSERT_IF( get_if<0>(&v) == nullptr );
- STATIC_ASSERT_IF( get_if<1>(&v) == nullptr );
- STATIC_ASSERT_IF( get_if<2>(&v) == &get<2>(v) );
- }
- }
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