This adds the _NEWHANDLER keyword to make a clear difference between existing legacy code and new QB64-PE specific code. It was required as the simple addition of a history chain to the legacy ON ERROR GOTO syntax introduced a potential memory leak to existing legacy code.
Now with _NEWHANDLER the possibility for this memory leak still exists and special care should be taken when using it, but at least existing code will not break anymore.
Legacy Syntax:
ON ERROR GOTO {label|0}
Extended QB64-PE Syntax:
ON ERROR GOTO [_LASTHANDLER|_NEWHANDLER label]
where the use of _NEWHANDLER will save the current handler to the history chain before actually setting the new handler, and _LASTHANDLER is used to restore back to the most recently saved handler.
The use of the legacy ON ERROR GOTO 0 will also reset/clear all saved history entries.
This adds the _NEWHANDLER keyword to make a clear difference between existing legacy code and new QB64-PE specific code. It was required as the simple addition of a history chain to the legacy ON ERROR GOTO syntax introduced a potential memory leak to existing legacy code.
Now with _NEWHANDLER the possibility for this memory leak still exists and special care should be taken when using it, but at least existing code will not break anymore.
Legacy Syntax:
ON ERROR GOTO {label|0}Extended QB64-PE Syntax:
ON ERROR GOTO [_LASTHANDLER|_NEWHANDLER label]where the use of _NEWHANDLER will save the current handler to the history chain before actually setting the new handler, and _LASTHANDLER is used to restore back to the most recently saved handler. The use of the legacy
ON ERROR GOTO 0will also reset/clear all saved history entries.