withCancel

fnR withCancel(R, P...)(R delegate(CancelToken, P) @safe fn, P args) @safe

Execute a function with automatic cancellation propagation.

Creates a CancelGuard, passes its token to the provided function, and cancels the guard when the function returns. The cancellation happens regardless of how the function exits (normal return, exception, or early return).

Parameters

`fn`	Function to execute. Receives a `CancelToken` as the first argument.
`args`	Additional arguments forwarded to `fn`.

Returns

The value returned by fn.