# `GSFeatureGenerator updateClass:forFont:error:`

*Instance Method*

## Declaration

```swift
func update(_ aClass: GSClass, for font: GSFont) throws
```

```objc
- (BOOL) updateClass:(GSClass *) aClass forFont:(GSFont *) font error:(NSError **) error;
```

```python
updateClass_forFont_error_(aClass: GSClass, font: GSFont) -> tuple[bool, NSError]
```