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Diffstat (limited to 'src/boost/libs/hana/example/optional/applicative.cpp')
-rw-r--r-- | src/boost/libs/hana/example/optional/applicative.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/optional/applicative.cpp b/src/boost/libs/hana/example/optional/applicative.cpp new file mode 100644 index 000000000..3c67c30e9 --- /dev/null +++ b/src/boost/libs/hana/example/optional/applicative.cpp @@ -0,0 +1,19 @@ +// 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/ap.hpp> +#include <boost/hana/assert.hpp> +#include <boost/hana/equal.hpp> +#include <boost/hana/optional.hpp> +namespace hana = boost::hana; + + +constexpr char next(char c) { return c + 1; } + +static_assert(hana::ap(hana::just(next), hana::just('x')) == hana::just('y'), ""); +BOOST_HANA_CONSTANT_CHECK(hana::ap(hana::nothing, hana::just('x')) == hana::nothing); +BOOST_HANA_CONSTANT_CHECK(hana::ap(hana::just(next), hana::nothing) == hana::nothing); +BOOST_HANA_CONSTANT_CHECK(hana::ap(hana::nothing, hana::nothing) == hana::nothing); + +int main() { } |