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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>
- using namespace boost::variant2;
- struct X
- {
- constexpr operator int() const { return 2; }
- };
- #define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
- int main()
- {
- {
- constexpr variant<int> v( 1 );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 1 );
- }
- {
- constexpr variant<int> v( 'a' );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 'a' );
- }
- {
- constexpr variant<int> v( X{} );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 2 );
- }
- {
- constexpr variant<int const> v( 1 );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 1 );
- }
- {
- constexpr variant<int const> v( 'a' );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 'a' );
- }
- {
- constexpr variant<int const> v( X{} );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( get<0>(v) == 2 );
- }
- {
- constexpr variant<int, float, X> v( 1 );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( holds_alternative<int>(v) );
- STATIC_ASSERT( get<0>(v) == 1 );
- }
- {
- constexpr variant<int, float, X> v( 'a' );
- STATIC_ASSERT( v.index() == 0 );
- STATIC_ASSERT( holds_alternative<int>(v) );
- STATIC_ASSERT( get<0>(v) == 'a' );
- }
- {
- constexpr variant<int, float, X> v( 3.14f );
- STATIC_ASSERT( v.index() == 1 );
- STATIC_ASSERT( holds_alternative<float>(v) );
- STATIC_ASSERT( get<1>(v) == 3.14f );
- }
- {
- constexpr variant<int, float, X> v( X{} );
- STATIC_ASSERT( v.index() == 2 );
- STATIC_ASSERT( holds_alternative<X>(v) );
- }
- {
- constexpr variant<int, int, float, X> v( 3.14f );
- STATIC_ASSERT( v.index() == 2 );
- STATIC_ASSERT( holds_alternative<float>(v) );
- STATIC_ASSERT( get<2>(v) == 3.14f );
- }
- {
- constexpr variant<int, int, float, X> v( X{} );
- STATIC_ASSERT( v.index() == 3 );
- STATIC_ASSERT( holds_alternative<X>(v) );
- }
- }
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