May 26, 2018
Preserve error handlers and “local” variables across callbacks
When programming with callbacks in perl, you create anonymous functions with sub … . These functions are especially useful because when they are called they will preserve their surrounding lexical environment. Sometimes people call these anonymous functions that reference variables in their surrounding lexical scope “closures”. Whatever you call them, they are essential for convenient and efficient asynchronous programming.
For many applications we really like straightforward callback style. The goal of CallbackFrame is to simplify the management of dynamic environments while leaving callback style alone.