60 lines
1.8 KiB
C++
60 lines
1.8 KiB
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/concept/struct.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/fold_left.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include "minimal_struct.hpp"
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#include <laws/base.hpp>
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#include <support/minimal_product.hpp>
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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template <int i = 0>
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struct undefined { };
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struct MoveOnly {
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MoveOnly() = default;
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MoveOnly(MoveOnly&&) = default;
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MoveOnly(MoveOnly const&) = delete;
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MoveOnly& operator=(MoveOnly&&) = default;
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MoveOnly& operator=(MoveOnly const&) = delete;
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};
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int main() {
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constexpr auto pair = ::minimal_product;
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ct_eq<999> s{};
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hana::test::_injection<0> f{};
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::fold_left(obj(), s, undefined<>{}),
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s
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::fold_left(obj(ct_eq<0>{}), s, f),
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f(s, pair(hana::int_c<0>, ct_eq<0>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::fold_left(obj(ct_eq<0>{}, ct_eq<1>{}), s, f),
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f(f(s, pair(hana::int_c<0>, ct_eq<0>{})), pair(hana::int_c<1>, ct_eq<1>{}))
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::fold_left(obj(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), s, f),
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f(f(f(s, pair(hana::int_c<0>, ct_eq<0>{})),
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pair(hana::int_c<1>, ct_eq<1>{})),
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pair(hana::int_c<2>, ct_eq<2>{}))
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));
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// fold_left with move-only members
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hana::fold_left(obj(MoveOnly{}), 0, [](int, auto) { return 0; });
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hana::fold_left(obj(MoveOnly{}, MoveOnly{}), 0, [](int, auto) { return 0; });
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}
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