prng.h

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#ifndef GAME_PRNG_H
#define GAME_PRNG_H
 
#include <cstdint>
 
class CPrng
{
public:
    // Creates an unseeded instance.
    CPrng();
 
    // The name of the random number generator including the current seed.
    const char *Description() const;
 
    // Seeds the random number generator with the given integer. The random
    // sequence obtained by calling `RandomBits()` repeatedly is guaranteed
    // to be the same for the same seed.
    void Seed(uint64_t aSeed[2]);
 
    // Generates 32 random bits. `Seed()` must be called before calling
    // this function.
    unsigned int RandomBits();
 
private:
    char m_aDescription[64];
 
    bool m_Seeded;
    uint64_t m_State;
    uint64_t m_Increment;
};
 
#endif // GAME_PRNG_H