22 General utilities library [utilities]

22.11 Bit manipulation [bit]

In the following descriptions, let N denote numeric_limits<T>::digits.

template<class T>
  constexpr T rotl(T x, int s) noexcept;

Constraints: T is an unsigned integer type ([basic.fundamental]).

Let r be s % N.

Returns: If r is 0, x; if r is positive, (x << r) | (x >> (N - r)); if r is negative, rotr(x, -r).

template<class T>
  constexpr T rotr(T x, int s) noexcept;

Constraints: T is an unsigned integer type ([basic.fundamental]).

Let r be s % N.

Returns: If r is 0, x; if r is positive, (x >> r) | (x << (N - r)); if r is negative, rotl(x, -r).