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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include <functional>
#include <type_traits>
#include <utility>
namespace Utils
{
//////////////////
// find helpers
//////////////////
template<typename R, typename S, typename T>
decltype(auto) equal(R (S::*function)() const, T value)
{
// This should use std::equal_to<> instead of std::equal_to<T>,
// but that's not supported everywhere yet, since it is C++14
return std::bind<bool>(std::equal_to<T>(), value, std::bind(function, std::placeholders::_1));
}
template<typename R, typename S, typename T>
decltype(auto) equal(R S::*member, T value)
{
return std::bind<bool>(std::equal_to<T>(), value, std::bind(member, std::placeholders::_1));
}
//////////////////
// comparison predicates
//////////////////
template<typename Type, typename Compare, typename Projection>
auto compare(Type &&value, Compare compare, Projection projection)
{
if constexpr (std::is_lvalue_reference_v<Type>) {
return [&value, compare, projection](const auto &entry) {
return std::invoke(compare, value, std::invoke(projection, entry));
};
} else {
return [value = std::forward<Type>(value), compare, projection](const auto &entry) {
return std::invoke(compare, value, std::invoke(projection, entry));
};
}
}
template<typename Type, typename Projection = std::identity>
auto equalTo(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::equal_to{}, projection);
}
template<typename Type, typename Projection = std::identity>
auto unequalTo(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::not_equal_to{}, projection);
}
template<typename Type, typename Projection = std::identity>
auto lessThan(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::less{}, projection);
}
template<typename Type, typename Projection = std::identity>
auto lessEqualThan(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::less_equal{}, projection);
}
template<typename Type, typename Projection = std::identity>
auto greaterThan(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::greater{}, projection);
}
template<typename Type, typename Projection = std::identity>
auto greaterEqualThan(Type &&value, Projection projection = {})
{
return compare(value, std::ranges::greater_equal{}, projection);
}
} // namespace Utils
|
