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hana/example/maybe/monad.cpp
2014-08-25 12:33:49 -04:00

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688 B
C++

/*
@copyright Louis Dionne 2014
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/detail/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/foreign.hpp>
#include <boost/hana/maybe.hpp>
using namespace boost::hana;
int main() {
//! [main]
BOOST_HANA_CONSTEXPR_LAMBDA auto inc = [](auto x) {
return just(x + 1);
};
BOOST_HANA_CONSTEXPR_ASSERT(bind(just(1), inc) == just(2));
BOOST_HANA_CONSTANT_ASSERT(bind(nothing, inc) == nothing);
BOOST_HANA_CONSTEXPR_ASSERT(flatten(just(just(2))) == just(2));
//! [main]
}