72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/chain.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/optional.hpp>
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#include <laws/base.hpp>
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#include <support/tracked.hpp>
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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struct undefined { };
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int main() {
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hana::test::_injection<0> f{};
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(f)(),
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hana::just(f())
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(f)(ct_eq<0>{}),
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hana::just(f(ct_eq<0>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(f)(ct_eq<0>{}, ct_eq<1>{}),
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hana::just(f(ct_eq<0>{}, ct_eq<1>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(undefined{})(),
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hana::nothing
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(undefined{})(ct_eq<0>{}),
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hana::nothing
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::sfinae(undefined{})(ct_eq<0>{}, ct_eq<1>{}),
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hana::nothing
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));
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auto incr = hana::sfinae([](auto x) -> decltype(x + 1) {
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return x + 1;
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});
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BOOST_HANA_RUNTIME_CHECK(hana::equal(
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incr(1),
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hana::just(2)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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incr(undefined{}),
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hana::nothing
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));
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BOOST_HANA_RUNTIME_CHECK(hana::equal(
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hana::chain(hana::just(1), incr),
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hana::just(2)
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));
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// using `sfinae` with a non-pod argument used to fail
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hana::sfinae(undefined{})(Tracked{1});
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hana::sfinae([t = Tracked{1}](auto) { return 1; })(Tracked{1});
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}
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