18 lines
587 B
C++
18 lines
587 B
C++
// Copyright Louis Dionne 2013-2017
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
|
|
|
|
#include <boost/hana/assert.hpp>
|
|
#include <boost/hana/not.hpp>
|
|
#include <boost/hana/optional.hpp>
|
|
namespace hana = boost::hana;
|
|
|
|
|
|
struct undefined { };
|
|
|
|
int main() {
|
|
BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(hana::nothing));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_nothing(hana::just(undefined{}))));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_nothing(hana::just(hana::nothing))));
|
|
}
|