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cc3k/src/rng.h

39 lines
1.1 KiB
C++

#ifndef __RNG_H__
#define __RNG_H__
#include <time.h>
#include <stdlib.h>
#include <vector>
#include "fraction.h"
// Technically, you should ONLY define one rng for the entire program
// IMPORTANT: pass all RNG objects as references
class RNG final {
private:
const unsigned int init_seed;
int curr_rand_num;
public:
RNG(); // use time(0) as the seed
RNG(const unsigned int seed); // use a seed
int rand_num(); // returns a random number between 0 and RAND_MAX
// IMPORTANT: all upper bounds are not included, all lower bounds are
int rand_between(const int lower_bound, const int upper_bound);
// returns a random number between 0 and upper_bound
int rand_under(const int upper_bound);
unsigned int get_init_seed() const;
int get_curr_rand_num() const;
bool trial(fraction &psuccess);
template<class T> T &get_rand_in_vector(std::vector<T> &vec) {
curr_rand_num = rand();
return vec[curr_rand_num % vec.size()];
}
};
#endif