TMt19937.h

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#pragma once
 
#include "Math/Random/TUniformRandomBitGenerator.h"
 
#include <Common/primitive_type.h>
 
#include <random>
#include <type_traits>
 
namespace ph::math
{
 
template<typename Bits>
class TMt19937 final : public TUniformRandomBitGenerator<TMt19937<Bits>, Bits>
{
    static_assert(std::is_same_v<Bits, uint32> || std::is_same_v<Bits, uint64>,
        "Supports only `uint32` and `uint64` bits types.");
 
public:
    PH_DEFINE_INLINE_RULE_OF_5_MEMBERS(TMt19937);
 
    explicit TMt19937(Bits seed);
 
    Bits impl_generate();
    void impl_jumpAhead(uint64 distance);
 
private:
    // There are 32 & 64 bit versions, select the one based on `BitsT`
    using StdGeneratorType = std::conditional_t<std::is_same_v<Bits, uint32>,
        std::mt19937, std::mt19937_64>;
 
    StdGeneratorType m_generator;
};
 
template<typename Bits>
inline TMt19937<Bits>::TMt19937(const Bits seed)
    : m_generator(seed)
{}
 
template<typename Bits>
inline Bits TMt19937<Bits>::impl_generate()
{
    return static_cast<Bits>(m_generator());
}
 
template<typename Bits>
inline void TMt19937<Bits>::impl_jumpAhead(const uint64 distance)
{
    m_generator.discard(distance);
}
 
}// end namespace ph::math