clang-tidy - google-objc-avoid-throwing-exception — Extra Clang Tools 8 documentation

# Extra Clang Tools 8 documentation

## clang-tidy - google-objc-avoid-throwing-exception

# google-objc-avoid-throwing-exception

Finds uses of throwing exceptions usages in Objective-C files.

For the same reason as the Google C++ style guide, we prefer not throwing exceptions from Objective-C code.

The corresponding C++ style guide rule: https://google.github.io/styleguide/cppguide.html#Exceptions

Instead, prefer passing in `NSError **` and return `BOOL` to indicate success or failure.

A counterexample:

    - (void)readFile {
      if ([self isError]) {
        @throw [NSException exceptionWithName:...];
      }
    }

Instead, returning an error via `NSError **` is preferred:

    - (BOOL)readFileWithError:(NSError **)error {
      if ([self isError]) {
        *error = [NSError errorWithDomain:...];
        return NO;
      }
      return YES;
    }

The corresponding style guide rule: http://google.github.io/styleguide/objcguide.html#avoid-throwing-exceptions