Return a copy of the current instance so that any changes to the current instance
would not be reflected in the returned copy. The copy will contain references to the
current instance keys and values, and the existing instance will also contain references
the same values up until the current instance attempts to change it's current state by
calling set() or rm() at which point a lazy objDeepCopy will be performed.
So if/when the referenced values are mutable values (object/array etc) any direct
changes to the value will be reflected on all references. The objDeepCopy() does not
clone classes.
A new IDbgUsrCtx instance
For each key defined for the current context (and it's parent) call the provided callback function with each key name and it's value. This will only call the callback function once for each name even when the same name is presen in the current instance and it's parent.
The callback function to call
Return the named context value from this instance or it's parent if present.
The name of the value to return
Optional dfValue: anyIf the named values does not exist in this instance or it's parent then return this value. The default will not be returned even if the value for the key is undefined or null.
The value contained in the context or the default
Return whether the named context value is available from this instance ir it's parent.
The name of the value to check if it's available
true if it's present otherwise false
Remove this named value from the context, this will cause any value from the parent to be returned again (if present) and the default value may be returned by get.
The key of the value to remove
Set the named value against the current context, this will replace any value within this instance. If the same key is present in the parent instance the value returned by the parent it not altered.
Even if the value set is undefined / null this will still be used as an override for any parent and will be deemed to be present (so the default value for get would not be returned)
The key of the value to set
The value to set for the given name
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The Debug user context used for passing user provided context to log records