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29 lines
738 B
C++
29 lines
738 B
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/maybe.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 <boost/hana/detail/static_assert.hpp>
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#include <tuple>
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using namespace boost::hana;
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template <int i>
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constexpr auto x = detail::minimal::comparable<>(i);
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BOOST_HANA_CONSTEXPR_LAMBDA auto f = [](auto s, auto x) {
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return std::make_tuple(s, x);
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};
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int main() {
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constexpr auto s = x<999>;
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BOOST_HANA_STATIC_ASSERT(foldl(f, s, just(x<0>)) == f(s, x<0>));
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BOOST_HANA_STATIC_ASSERT(foldl(f, s, nothing) == s);
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}
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