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- // 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/chain.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/optional.hpp>
- #include <laws/base.hpp>
- #include <support/tracked.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- struct undefined { };
- int main() {
- hana::test::_injection<0> f{};
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(f)(),
- hana::just(f())
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(f)(ct_eq<0>{}),
- hana::just(f(ct_eq<0>{}))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(f)(ct_eq<0>{}, ct_eq<1>{}),
- hana::just(f(ct_eq<0>{}, ct_eq<1>{}))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(undefined{})(),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(undefined{})(ct_eq<0>{}),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::sfinae(undefined{})(ct_eq<0>{}, ct_eq<1>{}),
- hana::nothing
- ));
- auto incr = hana::sfinae([](auto x) -> decltype(x + 1) {
- return x + 1;
- });
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- incr(1),
- hana::just(2)
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- incr(undefined{}),
- hana::nothing
- ));
- BOOST_HANA_RUNTIME_CHECK(hana::equal(
- hana::chain(hana::just(1), incr),
- hana::just(2)
- ));
- // using `sfinae` with a non-pod argument used to fail
- hana::sfinae(undefined{})(Tracked{1});
- hana::sfinae([t = Tracked{1}](auto) { return 1; })(Tracked{1});
- }
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