45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
#include "Rand.hpp"
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#include <chrono>
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std::unique_ptr<std::mt19937> Rand::generator;
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int32_t Rand::rand(int32_t startInclusive, int32_t endExclusive) {
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std::uniform_int_distribution<int32_t> dist(startInclusive, endExclusive - 1);
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return dist(*Rand::generator);
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}
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int32_t Rand::rand(int32_t endExclusive) {
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return Rand::rand(0, endExclusive);
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}
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int32_t Rand::rand() {
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return Rand::rand(0, INT32_MAX);
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}
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int32_t Rand::randWeighted(const std::vector<int32_t>& weights) {
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std::discrete_distribution<int32_t> dist(weights.begin(), weights.end());
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return dist(*Rand::generator);
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}
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float Rand::randFloat(float startInclusive, float endExclusive) {
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std::uniform_real_distribution<float> dist(startInclusive, endExclusive);
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return dist(*Rand::generator);
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}
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float Rand::randFloat(float endExclusive) {
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std::uniform_real_distribution<float> dist(0.0f, endExclusive);
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return dist(*Rand::generator);
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}
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float Rand::randFloat() {
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std::uniform_real_distribution<float> dist(0.0f, 1.0f);
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return dist(*Rand::generator);
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}
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void Rand::init() {
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// modern equivalent of srand(time(0))
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uint64_t seed = std::chrono::high_resolution_clock::now().time_since_epoch().count();
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Rand::generator = std::make_unique<std::mt19937>(std::mt19937(seed));
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}
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