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1 // Copyright Louis Dionne 2013-2017
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
5 #include <boost/hana/functional/placeholder.hpp>
6 namespace hana
= boost::hana
;
9 constexpr auto plus
= hana::_
+ hana::_
;
10 static_assert(plus(1, 2) == 1 + 2, "");
12 constexpr auto increment
= hana::_
+ 1;
13 static_assert(increment(1) == 2, "");
15 constexpr auto twice
= 2 * hana::_
;
16 static_assert(twice(1) == 2, "");
18 // Extra arguments are ignored.
19 static_assert(twice(1, "ignored") == 2, "");