std::rotl

Since C++20

Header: <bit>

Computes the result of bitwise left-rotating the value of x by s positions. This operation is also known as a left circular shift.

# Declarations

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

(since C++20)

# Parameters

# Return value

The result of bitwise left-rotating x by s positions.

# Notes

Feature-test macro Value Std Feature __cpp_lib_bitops 201907L (C++20) Bit operations

# Example

#include <bit>
#include <bitset>
#include <cstdint>
#include <iostream>
 
int main()
{
    using bin = std::bitset<8>;
    const std::uint8_t x{0b00011101};
    std::cout << bin(x) << " <- x\n";
    for (const int s : {0, 1, 4, 9, -1})
        std::cout << bin(std::rotl(x, s)) << " <- rotl(x, " << s << ")\n";
}

# See also