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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
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@copyright Louis Dionne 2014
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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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*/
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#include <boost/hana/assert.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/functional.hpp>
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#include <boost/hana/maybe.hpp>
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#include <boost/hana/tuple.hpp>
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using namespace boost::hana;
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int main() {
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//! [ap]
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = _ + _;
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BOOST_HANA_CONSTEXPR_CHECK(
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ap(lift<Tuple>(f), tuple(1, 2), tuple(3, 4, 5))
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==
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tuple(
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f(1, 3), f(1, 4), f(1, 5),
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f(2, 3), f(2, 4), f(2, 5)
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)
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);
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BOOST_HANA_CONSTEXPR_LAMBDA auto g = [](auto a, auto b, auto c) {
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return a * b * c;
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};
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BOOST_HANA_CONSTEXPR_CHECK(
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ap(lift<Maybe>(g), just(1), just(2), just(3)) == just(1 * 2 * 3)
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);
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BOOST_HANA_CONSTANT_CHECK(
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ap(lift<Maybe>(g), just(1), nothing, just(3)) == nothing
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);
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//! [ap]
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//! [lift]
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BOOST_HANA_CONSTEXPR_CHECK(lift<Tuple>('x') == tuple('x'));
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BOOST_HANA_CONSTEXPR_CHECK(lift<Maybe>('x') == just('x'));
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//! [lift]
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}
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