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
|
#ifndef RNG_HPP
#define RNG_HPP
#include <cstdlib>
#include <ctime>
#define FRAND_MAX float(RAND_MAX)
struct RNG {
RNG() {
srand(time(0));
}
/* random float in range [0, range] */
/* (rand() can return RAND_MAX) */
float RandFloat(float range = 1.0f) const {
range = (range < 0.0f)? -range: range;
return ((rand() / FRAND_MAX) * range);
}
/* random int in range [0, (-)range] */
/* (rand() can return RAND_MAX) */
int RandInt(int range = 1) const {
return int((rand() / FRAND_MAX) * range);
}
};
/* static const, so srand() only instantiated once */
const static RNG rng;
#endif
|
