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_left.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 initial state
|
|
{
|
|
auto f = hana::metafunction<F>;
|
|
auto s = hana::type_c<struct initial_state>;
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<>, s, f),
|
|
s
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0>, s, f),
|
|
f(s, hana::type_c<x0>)
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1>, s, f),
|
|
f(f(s, hana::type_c<x0>), hana::type_c<x1>)
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1, x2>, s, f),
|
|
f(f(f(s, hana::type_c<x0>), hana::type_c<x1>), hana::type_c<x2>)
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1, x2, x3>, s, f),
|
|
f(f(f(f(s, hana::type_c<x0>), hana::type_c<x1>), hana::type_c<x2>), hana::type_c<x3>)
|
|
));
|
|
}
|
|
|
|
// tuple_t and no initial state
|
|
{
|
|
auto f = hana::metafunction<F>;
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0>, f),
|
|
hana::type_c<x0>
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1>, f),
|
|
f(hana::type_c<x0>, hana::type_c<x1>)
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1, x2>, f),
|
|
f(f(hana::type_c<x0>, hana::type_c<x1>), hana::type_c<x2>)
|
|
));
|
|
BOOST_HANA_CONSTANT_CHECK(hana::equal(
|
|
hana::fold_left(hana::tuple_t<x0, x1, x2, x3>, f),
|
|
f(f(f(hana::type_c<x0>, hana::type_c<x1>), hana::type_c<x2>), hana::type_c<x3>)
|
|
));
|
|
}
|
|
}
|