meta_random.hpp

#ifndef META_RANDOM_HPP
#define META_RANDOM_HPP

#include <limits>

namespace snowapril {
    constexpr int RandomSeed(void) {
        return '0' * -40271 + // offset accounting for digits' ANSI offsets
            __TIME__[7] * 1 +
            __TIME__[6] * 10 +
            __TIME__[4] * 60 +
            __TIME__[3] * 600 +
            __TIME__[1] * 3600 +
            __TIME__[0] * 36000;
    };

    template <unsigned int a,
        unsigned int c,
        unsigned int seed,
        unsigned int Limit>
        struct LinearCongruentialEngine {
        enum { value = (a * LinearCongruentialEngine<a, c - 1, seed, Limit>::value + c) % Limit };
    };

    template <unsigned int a,
        unsigned int seed,
        unsigned int Limit>
        struct LinearCongruentialEngine<a, 0, seed, Limit> {
        enum { value = (a * seed) % Limit };
    };

    template <int N, int Limit>
    struct MetaRandom {
        enum { value = LinearCongruentialEngine<16807, N, RandomSeed(), Limit>::value };
    };

}

#endif