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
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
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_right.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_right(obj(), s, undefined<>{}),
s
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::fold_right(obj(ct_eq<0>{}), s, f),
f(pair(hana::int_c<0>, ct_eq<0>{}), s)
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::fold_right(obj(ct_eq<0>{}, ct_eq<1>{}), s, f),
f(pair(hana::int_c<0>, ct_eq<0>{}), f(pair(hana::int_c<1>, ct_eq<1>{}), s))
));
BOOST_HANA_CONSTANT_CHECK(hana::equal(
hana::fold_right(obj(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), s, f),
f(pair(hana::int_c<0>, ct_eq<0>{}),
f(pair(hana::int_c<1>, ct_eq<1>{}),
f(pair(hana::int_c<2>, ct_eq<2>{}), s)))
));
// fold_right with move-only members
hana::fold_right(obj(MoveOnly{}), 0, [](auto, int) { return 0; });
hana::fold_right(obj(MoveOnly{}, MoveOnly{}), 0, [](auto, int) { return 0; });
}
|
