44 lines
1.0 KiB
C++
44 lines
1.0 KiB
C++
|
|
// 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;
|
|
|
|
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
|
|
|
|
int main()
|
|
{
|
|
{
|
|
constexpr variant<int> v;
|
|
STATIC_ASSERT( holds_alternative<int>( v ) );
|
|
}
|
|
|
|
{
|
|
constexpr variant<int, float> v;
|
|
STATIC_ASSERT( holds_alternative<int>( v ) );
|
|
STATIC_ASSERT( !holds_alternative<float>( v ) );
|
|
}
|
|
|
|
{
|
|
constexpr variant<int, float> v( 3.14f );
|
|
STATIC_ASSERT( !holds_alternative<int>( v ) );
|
|
STATIC_ASSERT( holds_alternative<float>( v ) );
|
|
}
|
|
|
|
{
|
|
constexpr variant<int, float, float> v;
|
|
STATIC_ASSERT( holds_alternative<int>( v ) );
|
|
}
|
|
|
|
{
|
|
constexpr variant<int, int, float> v( 3.14f );
|
|
STATIC_ASSERT( holds_alternative<float>( v ) );
|
|
}
|
|
}
|