19. if_not_null macro

The if_not_null module exposes single if_not_null pattern.

All functions and symbols are in “if_not_null” module, use require to get access to it.

require daslib/if_not_null

19.1. Call macros

This macro transforms:

ptr |> if_not_null <| call(...)

to:

var _ptr_var = ptr
if _ptr_var
    call(*_ptr_var,...)