[ceph.git] / ceph / src / boost / libs / hana / example / functional / placeholder.cpp

// 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() { }
Commit	Line	Data
b32b8144	1	// Copyright Louis Dionne 2013-2017
7c673cae FG	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() { }