Applies a visitor to this value.

  Applies a visitor to this value.
Returns: a visitor-specified result
Parameters:
- R - the return type of the visitor's methods
- P - the type of the additional parameter to the visitor's methods
- v - the visitor operating on this value
- p - additional parameter to the visitor

  Returns the value.

  Returns the value.
Returns: the value

  Returns a string representation of this value.

  Returns a string representation of this value.
This is returned in a form suitable for representing this value
in the source code of an annotation.
Returns: a string representation of this value