public int next()

in commons-rng-core/src/main/java/org/apache/commons/rng/core/source32/MersenneTwister.java [256:288]

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

    public int next() {
        int y;

        if (mti >= N) { // Generate N words at one time.
            int mtNext = mt[0];
            for (int k = 0; k < N - M; ++k) {
                final int mtCurr = mtNext;
                mtNext = mt[k + 1];
                y = (mtCurr & UPPER_MASK) | (mtNext & LOWER_MASK);
                mt[k] = mt[k + M] ^ (y >>> 1) ^ MAG01[y & 1];
            }
            for (int k = N - M; k < N - 1; ++k) {
                final int mtCurr = mtNext;
                mtNext = mt[k + 1];
                y = (mtCurr & UPPER_MASK) | (mtNext & LOWER_MASK);
                mt[k] = mt[k + (M - N)] ^ (y >>> 1) ^ MAG01[y & 1];
            }
            y = (mtNext & UPPER_MASK) | (mt[0] & LOWER_MASK);
            mt[N - 1] = mt[M - 1] ^ (y >>> 1) ^ MAG01[y & 1];

            mti = 0;
        }

        y = mt[mti++];

        // Tempering.
        y ^=  y >>> 11;
        y ^= (y << 7) & 0x9d2c5680;
        y ^= (y << 15) & 0xefc60000;
        y ^=  y >>> 18;

        return y;
    }