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41 lines
1.2 KiB
C++
41 lines
1.2 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/functional.hpp>
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#include <boost/hana/detail/assert.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/detail/minimal/comparable.hpp>
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#include <tuple>
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using namespace boost::hana;
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto ...x) {
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return std::make_tuple(1, x...);
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};
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BOOST_HANA_CONSTEXPR_LAMBDA auto g = [](auto ...x) {
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return std::make_tuple(2, x...);
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};
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BOOST_HANA_CONSTEXPR_LAMBDA auto h = [](auto ...x) {
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return std::make_tuple(3, x...);
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};
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template <int i>
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constexpr auto x = detail::minimal::comparable<>(i);
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int main() {
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g)(x<0>) == f(g(x<0>)));
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g)(x<0>, x<1>) == f(g(x<0>), x<1>));
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g)(x<0>, x<1>, x<2>) == f(g(x<0>), x<1>, x<2>));
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g, h)(x<0>) == f(g(h(x<0>))));
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g, h)(x<0>, x<1>) == f(g(h(x<0>)), x<1>));
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BOOST_HANA_CONSTEXPR_ASSERT(compose(f, g, h)(x<0>, x<1>, x<2>) == f(g(h(x<0>)), x<1>, x<2>));
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}
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