PriorityHap.attach

void attach(Handler handler, int priority = 0) @safe

Attach a delegate handler with the given priority.

`priority`	Lower values run first. Default is 0.
`handler`	Delegate handler to attach; `null` is ignored.

void attach(FunctionHandler handler, int priority = 0) @safe

Attach a free-function handler with the given priority.

`priority`	Lower values run first. Default is 0.
`handler`	Free-function handler to attach; `null` is ignored.