Resolve a scheme name to a specific stepper procedure pointer.
This is the session-safe path used by solver_runtime, while the legacy
module-global step pointer remains available for unit tests and older
call sites through init_time_scheme.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| procedure(stepper_iface), | intent(out), | pointer | :: | stepper | ||
| character(len=*), | intent(in) | :: | scheme |