Best practices for circular shift (rotate) operations in C++

Question

Left and right shift operators (<< and >>) are already available in C++. However, I couldn\'t find out how I could perform circular shift or rotate operations.

Answer 1

Since it's C++, use an inline function:

template  
INT rol(INT val) {
    return (val << 1) | (val >> (sizeof(INT)*CHAR_BIT-1));
}

C++11 variant:

template  
constexpr INT rol(INT val) {
    static_assert(std::is_unsigned::value,
                  "Rotate Left only makes sense for unsigned types");
    return (val << 1) | (val >> (sizeof(INT)*CHAR_BIT-1));
}