diff options
Diffstat (limited to 'src/boost/libs/hana/test/concept/struct/fold_left.cpp')
-rw-r--r-- | src/boost/libs/hana/test/concept/struct/fold_left.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/concept/struct/fold_left.cpp b/src/boost/libs/hana/test/concept/struct/fold_left.cpp new file mode 100644 index 000000000..f7b63814d --- /dev/null +++ b/src/boost/libs/hana/test/concept/struct/fold_left.cpp @@ -0,0 +1,59 @@ +// 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; }); +} |