A unary operator expression of the form is processed as follows: The string-literal is destringized by deleting any encoding-prefix, deleting the leading and trailing double-quotes, replacing each escape sequence \" by a double-quote, and replacing each escape sequence \\ by a single backslash.

The resulting sequence of characters is processed through translation phase 3 to produce preprocessing tokens that are executed as if they were the pp-tokens in a pragma directive.

The original four preprocessing tokens in the unary operator expression are removed.