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hana/example/mpl/find.cpp
2014-05-26 10:13:29 -04:00

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/*
* Copyright Louis Dionne 2014
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE.md or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/detail/static_assert.hpp>
#include <boost/hana/functional.hpp>
#include <boost/hana/list.hpp>
#include <boost/hana/maybe.hpp>
#include <boost/hana/type.hpp>
using namespace boost::hana;
int main() {
BOOST_HANA_CONSTEXPR_LAMBDA auto types = list_t<char, int, unsigned, long, unsigned long>;
BOOST_HANA_STATIC_ASSERT(find(_ == type<unsigned>, types) == just(type<unsigned>));
BOOST_HANA_STATIC_ASSERT(find(_ == type<void>, types) == nothing);
}