#ifndef BITS_H
#define BITS_H

#define BIT(n) (1 << (n))
#define BITS(n) (BIT(n) - 1)
#ifndef BRANCHLESS_BITSET
    #define BITSET(var, mask, flag) (flag ? (var) | (mask) : (var) &~ (mask))
#else
    #define BITSET(var, mask, flag) ((var) ^ (-(flag) ^ (var)) & (mask))
#endif

int lowestbit(int f)
{
    f &= ~(f << 1);
    f &= ~(f << 2);
    f &= ~(f << 4);
    f &= ~(f << 8);
    f &= ~(f << 16);
    return f;
}

#endif