blob: 16438db42b6ba14eca795636d3618114a1d58a95 (
plain)
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
|
/***************************************************************************************************
Copyright (C) 2025 The Qt Company Ltd.
SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
***************************************************************************************************/
using System.ComponentModel;
using Qt.DotNet.Utils;
namespace GeneratorTestApp
{
public class Prime : INotifyPropertyChanged
{
public int Index
{
get => lazy.Get(() => Index, () => 0);
set
{
lazy.Set(() => Index, value);
Value = NthPrime(value + 1);
}
}
public int this[int idx] { get => NthPrime(idx); set { } }
public int this[string idx] { get => NthPrime(int.Parse(idx)); set { } }
public int Value
{
get => lazy.Get(() => Value, () => 2);
set => lazy.Set(() => Value, value);
}
public event PropertyChangedEventHandler PropertyChanged
{
add { lazy.PropertyChanged += value; }
remove { lazy.PropertyChanged -= value; }
}
private LazyFactory lazy = new();
private static int NthPrime(int n)
{
int x = 2;
while (n > 0) {
if (IsPrime(x))
--n;
++x;
}
return x - 1;
}
private static bool IsPrime(int x)
{
if (x <= 1)
return false;
if (x == 2 || x == 3)
return true;
if (x % 2 == 0 || x % 3 == 0)
return false;
for (int i = 5; i * i <= x; i += 6)
if (x % i == 0 || x % (i + 2) == 0)
return false;
return true;
}
}
}
|
