[ceph.git] / ceph / src / boost / libs / hana / example / functional / overload_linearly.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/assert.hpp>
#include <boost/hana/functional/overload_linearly.hpp>

#include <string>
namespace hana = boost::hana;


auto f = hana::overload_linearly(
    [](int i) { return i + 1; },
    [](std::string s) { return s + "d"; },
    [](double) { BOOST_HANA_RUNTIME_CHECK(false && "never called"); }
);

int main() {
    BOOST_HANA_RUNTIME_CHECK(f(1) == 2);
    BOOST_HANA_RUNTIME_CHECK(f("abc") == "abcd");
    BOOST_HANA_RUNTIME_CHECK(f(2.2) == static_cast<int>(2.2) + 1);
}
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/assert.hpp>
	6	#include <boost/hana/functional/overload_linearly.hpp>
	7
	8	#include <string>
	9	namespace hana = boost::hana;
	10
	11
	12	auto f = hana::overload_linearly(
	13	[](int i) { return i + 1; },
	14	[](std::string s) { return s + "d"; },
	15	[](double) { BOOST_HANA_RUNTIME_CHECK(false && "never called"); }
	16	);
	17
	18	int main() {
	19	BOOST_HANA_RUNTIME_CHECK(f(1) == 2);
	20	BOOST_HANA_RUNTIME_CHECK(f("abc") == "abcd");
	21	BOOST_HANA_RUNTIME_CHECK(f(2.2) == static_cast<int>(2.2) + 1);
	22	}