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In the following descriptions, let N denote numeric_limits<T>​::​digits.
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template<class T> constexpr T rotl(T x, int s) noexcept;
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Returns: If r is 0, x; if r is positive, (x << r) | (x >> (N - r)); if r is negative, rotr(x, -r).
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template<class T> constexpr T rotr(T x, int s) noexcept;
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Returns: If r is 0, x; if r is positive, (x >> r) | (x << (N - r)); if r is negative, rotl(x, -r).

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