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Diffstat (limited to 'src/boost/libs/hana/example/optional/monad.cpp')
-rw-r--r-- | src/boost/libs/hana/example/optional/monad.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/optional/monad.cpp b/src/boost/libs/hana/example/optional/monad.cpp new file mode 100644 index 000000000..2be7821a6 --- /dev/null +++ b/src/boost/libs/hana/example/optional/monad.cpp @@ -0,0 +1,23 @@ +// 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/chain.hpp> +#include <boost/hana/config.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/flatten.hpp> +#include <boost/hana/optional.hpp> +namespace hana = boost::hana; + + +int main() { + BOOST_HANA_CONSTEXPR_LAMBDA auto inc = [](auto x) { + return hana::just(x + 1); + }; + + BOOST_HANA_CONSTEXPR_CHECK(hana::chain(hana::just(1), inc) == hana::just(2)); + BOOST_HANA_CONSTANT_CHECK(hana::chain(hana::nothing, inc) == hana::nothing); + + BOOST_HANA_CONSTEXPR_CHECK(hana::flatten(hana::just(hana::just(2))) == hana::just(2)); +} |