mirror of
https://github.com/boostorg/hana.git
synced 2026-01-20 16:42:13 +00:00
22 lines
643 B
C++
22 lines
643 B
C++
// Copyright Louis Dionne 2013-2016
|
|
// 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/config.hpp>
|
|
#include <boost/hana/equal.hpp>
|
|
#include <boost/hana/optional.hpp>
|
|
namespace hana = boost::hana;
|
|
|
|
|
|
int main() {
|
|
BOOST_HANA_CONSTEXPR_LAMBDA auto incr = [](auto x) -> decltype(x + 1) {
|
|
return x + 1;
|
|
};
|
|
|
|
BOOST_HANA_CONSTEXPR_CHECK(hana::sfinae(incr)(1) == hana::just(2));
|
|
|
|
struct invalid { };
|
|
BOOST_HANA_CONSTANT_CHECK(hana::sfinae(incr)(invalid{}) == hana::nothing);
|
|
}
|