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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/concept/struct.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/fold_left.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include "minimal_struct.hpp"
- #include <laws/base.hpp>
- #include <support/minimal_product.hpp>
- namespace hana = boost::hana;
- using hana::test::ct_eq;
- template <int i = 0>
- struct undefined { };
- struct MoveOnly {
- MoveOnly() = default;
- MoveOnly(MoveOnly&&) = default;
- MoveOnly(MoveOnly const&) = delete;
- MoveOnly& operator=(MoveOnly&&) = default;
- MoveOnly& operator=(MoveOnly const&) = delete;
- };
- int main() {
- constexpr auto pair = ::minimal_product;
- ct_eq<999> s{};
- hana::test::_injection<0> f{};
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_left(obj(), s, undefined<>{}),
- s
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_left(obj(ct_eq<0>{}), s, f),
- f(s, pair(hana::int_c<0>, ct_eq<0>{}))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_left(obj(ct_eq<0>{}, ct_eq<1>{}), s, f),
- f(f(s, pair(hana::int_c<0>, ct_eq<0>{})), pair(hana::int_c<1>, ct_eq<1>{}))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_left(obj(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), s, f),
- f(f(f(s, pair(hana::int_c<0>, ct_eq<0>{})),
- pair(hana::int_c<1>, ct_eq<1>{})),
- pair(hana::int_c<2>, ct_eq<2>{}))
- ));
- // fold_left with move-only members
- hana::fold_left(obj(MoveOnly{}), 0, [](int, auto) { return 0; });
- hana::fold_left(obj(MoveOnly{}, MoveOnly{}), 0, [](int, auto) { return 0; });
- }
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