Negate a boolean based on another boolean

Question

What's the short, elegant, bitwise way to write the last line of this C# code without writing b twice:

bool getAsIs = ....
bool b = ....

getAsIs ? b : !b

Answer 1

The truth table can be expressed as:

getAsIs    b    getAsIs ? b : !b
--------------------------------
0          0    1
0          1    0
1          0    0
1          1    1

The result can be expressed as:

result = (getAsIs == b);

Answer 2

Try using binary XOR (^ Operator (C# Reference)):

bool getAsIs = true;
bool b = false;

bool result = !(getAsIs ^ b);