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Diffstat (limited to 'src/boost/libs/hana/example/functional/placeholder.cpp')
-rw-r--r-- | src/boost/libs/hana/example/functional/placeholder.cpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/functional/placeholder.cpp b/src/boost/libs/hana/example/functional/placeholder.cpp new file mode 100644 index 000000000..31cbc4a55 --- /dev/null +++ b/src/boost/libs/hana/example/functional/placeholder.cpp @@ -0,0 +1,21 @@ +// 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/functional/placeholder.hpp> +namespace hana = boost::hana; + + +constexpr auto plus = hana::_ + hana::_; +static_assert(plus(1, 2) == 1 + 2, ""); + +constexpr auto increment = hana::_ + 1; +static_assert(increment(1) == 2, ""); + +constexpr auto twice = 2 * hana::_; +static_assert(twice(1) == 2, ""); + +// Extra arguments are ignored. +static_assert(twice(1, "ignored") == 2, ""); + +int main() { } |