Random.h

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#pragma once
 
#include "vec/vec2.h"
#include "vec/vec3.h"
#include "vec/vec4.h"
#include <ctime>
#include <random>
 
static bool TimeInitialized = false;
static int RandomSeed       = 2;
class Random
{
  static void InitTime(bool useSeed = true) {
    std::srand(useSeed ? RandomSeed : (int)time(0));
    TimeInitialized = true;
  }
 
public:
  static void SetSeed(int seed) {
    RandomSeed      = seed;
    TimeInitialized = false;
  }
  static double Get(double l = 0.0, double r = 1.0) {
    if(!TimeInitialized) InitTime(false);
 
    std::random_device rd;                       // create object for seeding
    std::mt19937 gen{ rd() };                    // create engine and seed it
    std::uniform_real_distribution<> dist(l, r); // create distribution for integers with [1; 9] range
    return dist(gen);
  }
  template<typename T>
  static vec2<T> Get(double l = 0.0, double r = 1.0) {
    if(!TimeInitialized) InitTime(false);
    return vec2<T>(Get(), Get());
  }
  template<typename T>
  static vec3<T> Get(double l = 0.0, double r = 1.0) {
    if(!TimeInitialized) InitTime(false);
    return vec3<T>(Get(), Get(), Get());
  }
  template<typename T>
  static vec4<T> Get(double l = 0.0, double r = 1.0) {
    if(!TimeInitialized) InitTime(false);
    return vec4<T>(Get(), Get(), Get(), Get());
  }
};