72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
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#ifndef ARBUTILS_RANDOM_HPP
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#define ARBUTILS_RANDOM_HPP
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#include <cstdint>
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#include <random>
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namespace Arbutils {
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template <class RandomT> class BaseRandom {
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private:
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RandomT _rng;
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public:
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BaseRandom();
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explicit BaseRandom(int32_t seed) : _rng(seed){};
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/// Gets a random float between 0.0 and 1.0.
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[[nodiscard]] inline float GetFloat() {
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return static_cast<float>(_rng()) / (static_cast<float>(std::mt19937::max() - std::mt19937::min()) - 0.5f);
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}
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/// Gets a random double between 0.0 and 1.0.
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[[nodiscard]] inline double GetDouble() {
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return static_cast<double>(_rng()) /
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((static_cast<double>(std::mt19937::max()) - std::mt19937::min()) - 0.5);
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}
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/// Gets a random 32 bit integer between 0 and max int.
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[[nodiscard]] inline int32_t Get() {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(std::numeric_limits<int32_t>::max()));
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}
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/// Gets a random 32 bit integer between 0, and given max parameter.
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/// \param max The exclusive max value the random value should be.
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[[nodiscard]] inline int32_t Get(int32_t max) {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(max));
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}
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/// Gets a random 32 bit integer between given min and max parameters.
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/// \param min The inclusive min value the random value should be.
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/// \param max The exclusive max value the random value should be.
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[[nodiscard]] inline int32_t Get(int32_t min, int32_t max) {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(max - min) + min);
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}
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/// Gets a random 32 bit unsigned integer between 0 and max unsigned int.
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[[nodiscard]] inline uint32_t GetUnsigned() {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(std::numeric_limits<uint32_t>::max()));
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}
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/// Gets a random 32 bit unsigned integer between 0, and given max parameter.
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/// \param max The exclusive max value the random value should be.
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[[nodiscard]] inline uint32_t GetUnsigned(uint32_t max) {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(max));
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}
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/// Gets a random 32 bit unsigned integer between given min and max parameters.
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/// \param min The inclusive min value the random value should be.
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/// \param max The exclusive max value the random value should be.
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[[nodiscard]] inline uint32_t GetUnsigned(uint32_t min, uint32_t max) {
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return static_cast<int32_t>(GetDouble() * static_cast<float>(max - min) + min);
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}
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};
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class Random : public BaseRandom<std::mt19937> {
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public:
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Random() : BaseRandom() {}
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Random(int32_t seed) : BaseRandom(seed) {}
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};
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}
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#endif // ARBUTILS_RANDOM_HPP
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