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1 | // Copyright Louis Dionne 2013-2016 | |
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) | |
4 | ||
5 | #include <boost/hana/functional/placeholder.hpp> | |
6 | namespace hana = boost::hana; | |
7 | ||
8 | ||
9 | constexpr auto plus = hana::_ + hana::_; | |
10 | static_assert(plus(1, 2) == 1 + 2, ""); | |
11 | ||
12 | constexpr auto increment = hana::_ + 1; | |
13 | static_assert(increment(1) == 2, ""); | |
14 | ||
15 | constexpr auto twice = 2 * hana::_; | |
16 | static_assert(twice(1) == 2, ""); | |
17 | ||
18 | // Extra arguments are ignored. | |
19 | static_assert(twice(1, "ignored") == 2, ""); | |
20 | ||
21 | int main() { } |