blob: 49195b5eee6606b6171da8716ed1667a4bcdfdbd (
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
|
#pragma once
#include <iostream>
#include "defs.h"
using namespace std;
template <typename T>
constexpr static T clearLowestBit(T value) {
return value & (value - 1);
}
template <typename T>
constexpr static bool ispow2(T value) {
return clearLowestBit(value) == 0;
}
template <typename T>
constexpr static T ceil2(T value) {
T value2 = clearLowestBit(value);
if (value2 == 0) return value;
while (true) {
value = value2;
value2 = clearLowestBit(value);
if (value2 == 0) return value << 1;
}
}
template <typename T>
constexpr static T ipow(T base, T ex) {
T x = 1, y = base;
while (ex > 0) {
if ((ex & 1) == 1) x *= y;
y *= y;
ex >>= 1;
}
return x;
}
|
