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Jonathan Lebon authored
These are equivalent to the non-null throw, except that the returned value is a NULL pointer. They can be used in functions where one wants to return a pointer. E.g.: GKeyFile *foo(GError **error) { return glnx_null_throw (error, "foobar"); } The function call redirections are wrapped around a compound statement expression[1] so that they represent a single top-level expression. This allows us to avoid -Wunused-value warnings vs using a comma operator if the return value isn't used. I made the 'args...' absorb the fmt argument as well so that callers can still use it without always having to specify at least one additional variadic argument. I had to check to be sure that the expansion is all done by the preprocessor, so we don't need to worry about stack intricacies. [1] https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
Jonathan Lebon authoredThese are equivalent to the non-null throw, except that the returned value is a NULL pointer. They can be used in functions where one wants to return a pointer. E.g.: GKeyFile *foo(GError **error) { return glnx_null_throw (error, "foobar"); } The function call redirections are wrapped around a compound statement expression[1] so that they represent a single top-level expression. This allows us to avoid -Wunused-value warnings vs using a comma operator if the return value isn't used. I made the 'args...' absorb the fmt argument as well so that callers can still use it without always having to specify at least one additional variadic argument. I had to check to be sure that the expansion is all done by the preprocessor, so we don't need to worry about stack intricacies. [1] https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html