public long next()

in commons-rng-core/src/main/java/org/apache/commons/rng/core/source64/MersenneTwister64.java [176:203]

• 22 lines of code
• 4 McCabe index (conditional complexity)

    public long next() {
        long x;

        if (mti >= NN) { // generate NN words at one time
            for (int i = 0; i < NN - MM; i++) {
                x = (mt[i] & UM) | (mt[i + 1] & LM);
                mt[i] = mt[i + MM] ^ (x >>> 1) ^ MAG01[(int)(x & 0x1L)];
            }
            for (int i = NN - MM; i < NN - 1; i++) {
                x = (mt[i] & UM) | (mt[i + 1] & LM);
                mt[i] = mt[ i + (MM - NN)] ^ (x >>> 1) ^ MAG01[(int)(x & 0x1L)];
            }

            x = (mt[NN - 1] & UM) | (mt[0] & LM);
            mt[NN - 1] = mt[MM - 1] ^ (x >>> 1) ^ MAG01[(int)(x & 0x1L)];

            mti = 0;
        }

        x = mt[mti++];

        x ^= (x >>> 29) & 0x5555555555555555L;
        x ^= (x << 17) & 0x71d67fffeda60000L;
        x ^= (x << 37) & 0xfff7eee000000000L;
        x ^= x >>> 43;

        return x;
    }