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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/equal.hpp>
- #include <boost/hana/fold_right.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/type.hpp>
- namespace hana = boost::hana;
- template <typename ...>
- struct F { struct type; };
- struct x0;
- struct x1;
- struct x2;
- struct x3;
- int main() {
- // tuple_t and an initial state
- {
- auto f = hana::metafunction<F>;
- auto s = hana::type_c<struct initial_state>;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<>, s, f),
- s
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0>, s, f),
- f(hana::type_c<x0>, s)
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1>, s, f),
- f(hana::type_c<x0>, f(hana::type_c<x1>, s))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1, x2>, s, f),
- f(hana::type_c<x0>, f(hana::type_c<x1>, f(hana::type_c<x2>, s)))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1, x2, x3>, s, f),
- f(hana::type_c<x0>, f(hana::type_c<x1>, f(hana::type_c<x2>, f(hana::type_c<x3>, s))))
- ));
- }
- // tuple_t and no initial state
- {
- auto f = hana::metafunction<F>;
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0>, f),
- hana::type_c<x0>
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1>, f),
- f(hana::type_c<x0>, hana::type_c<x1>)
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1, x2>, f),
- f(hana::type_c<x0>, f(hana::type_c<x1>, hana::type_c<x2>))
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::fold_right(hana::tuple_t<x0, x1, x2, x3>, f),
- f(hana::type_c<x0>, f(hana::type_c<x1>, f(hana::type_c<x2>, hana::type_c<x3>)))
- ));
- }
- }
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