1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
// 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/if.hpp>
#include <boost/hana/integral_constant.hpp>
#include <boost/hana/minus.hpp>
#include <boost/hana/optional.hpp>
#include <boost/hana/pair.hpp>
#include <boost/hana/tuple.hpp>
#include <boost/hana/unfold_left.hpp>
namespace hana = boost::hana;
BOOST_HANA_CONSTANT_CHECK(
hana::unfold_left<hana::tuple_tag>(hana::int_c<10>, [](auto x) {
return hana::if_(x == hana::int_c<0>,
hana::nothing,
hana::just(hana::make_pair(x - hana::int_c<1>, x))
);
})
==
hana::tuple_c<int, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10>
);
int main() { }
|
