69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// 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>)))
|
|
));
|
|
}
|
|
}
|