is_registered

Description:

public bool is_registered (string namespace_, string? version)

Check whether a particular namespace (and optionally, a specific version thereof) is currently loaded.

This function is likely to only be useful in unusual circumstances; in order to act upon metadata in the namespace, you should call require instead which will ensure the namespace is loaded, and return as quickly as this function will if it has already been loaded.

Parameters:

this	A Repository or `null` for the singleton process-global default Repository
namespace_	Namespace of interest
version	Required version, may be `null` for latest

Returns:

true if namespace-version is loaded, false otherwise