syberia_stack: A helper interface for a stack of syberia resources.
In robertzk/syberiaStructure: Syberia Structure

Description Usage Arguments Details Value Examples

This function is meant to be used by syberia for pushing and popping resource reference onto a stack, e.g., to keep track of dependencies for a given syberia model.

1	syberia_stack(value, all = FALSE)

`value`	ANY. Push a value onto the stac.
`all`	logical. Whether or not to pop and return all values from the stack. The default is `FALSE`.

This function is meant to be used as follows. Calling syberia_stack() pops the latest value off the stack. If no value exists, the stack gets created in the syberiaStructure cache with key 'resource_stack' if it is not present, or otherwise returns NULL.

If a single unnamed value is passed, like syberia_stack("foo"), it is pushed onto the stack (if the stack does not exist in the cache, it gets created extemporaneously).

the popped value(s)

## Not run: 
  syberia_stack(all = TRUE) # Create a new stack
  lapply(1:5, syberia_stack) # Push 1 through 5 onto the stack
  syberia_stack(all = TRUE) # Clear the stack and return as.list(1:5)

## End(Not run)