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 ~                       Bitwise NOT Operator (unary)

 ~exp                    bitwise NOT
 exp                     any integral type (int, char, enum, etc.)

    The unary operator ~ performs a bit-by-bit complement on exp,
    converting each 0 bit to a 1 and each 1 bit to a 0.  The result is of
    the same type as exp.  For example:

           j = 0x0F71;
           i = ~j;              /* i == 0xF08E */

    You also use ~ in the declaration of destructor functions.