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
|
#pragma once
#include <memory>
#include <set>
namespace flat {
namespace core {
enum class priority_t : unsigned {
max = 0,
higher = 1,
high = 2,
none = 3,
low = 4,
lower = 5,
min = 6,
};
class prioritized {
public:
const priority_t priority;
prioritized(priority_t p = priority_t::none)
: priority(p) {}
};
struct prioritize {
bool operator()(const prioritized& lhs, const prioritized& rhs) {
return lhs.priority < rhs.priority;
}
bool operator()(const std::weak_ptr<prioritized> lhs, const std::weak_ptr<prioritized> rhs) {
if (auto l = lhs.lock()) {
if (auto r = rhs.lock()) {
// if both valid, check their priority
// in case they are the same, left is prioritized
return l->priority < r->priority;
} else {
// if right is expired, left is prioritized
return true;
}
} else {
// if left is expired, the right is prioritized
return false;
}
}
};
template<typename Prioritized>
using queue = std::multiset<Prioritized, prioritize>;
}
}
|
