32 lines
903 B
C++
32 lines
903 B
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/define_struct.hpp>
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#include <boost/hana/fold_left.hpp>
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#include <boost/hana/second.hpp>
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namespace hana = boost::hana;
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struct Kitten {
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BOOST_HANA_DEFINE_STRUCT(Kitten,
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(int, extremely_cute),
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(int, cute),
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(int, not_so_cute)
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);
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};
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int main() {
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constexpr Kitten kitten{5, 10, 0};
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BOOST_HANA_CONSTEXPR_CHECK(
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hana::fold_left(kitten, 0, [](auto total, auto member) {
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// first(member) is the name of the member, here
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// "extremely_cute", or "cute" or "not_so_cute",
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// and second(member) is its value.
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return hana::second(member) + total;
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}) == (5 + 10 + 0)
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);
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}
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