&^ operator in Go is the bit clear (AND NOT) operator. It is a binary operator that forces bits in the left operand to 0 if the corresponding bits in the right operand are set to 1. If a bit in the right operand is 0, the corresponding bit in the left operand remains unchanged.
Syntax
Logical Equivalence
In Go,x &^ y is strictly equivalent to performing a bitwise AND on x and the bitwise complement (NOT) of y.
&^ as a dedicated operator to perform this operation in a single step, avoiding the need to manually invert the right operand before applying the AND operation.
Truth Table
The operation evaluates each bit position independently according to the following logic:
Rule of thumb: The right operand acts as a mask. A
1 in the mask clears the bit. A 0 in the mask leaves the bit alone.
Bitwise Mechanics
To visualize the operation, align the binary representations of two 8-bit integers:- The upper 4 bits of
yare0. Therefore, the upper 4 bits ofx(1010) are preserved in the result. - The lower 4 bits of
yare1. Therefore, the lower 4 bits ofx(1010) are forced to0000in the result.
Code Implementation
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