Makes the fields and methods of an Class accessible via the $
operator. This method is never called explicitly, but through an indirect
usage of the $ operator, e.g. obj$name or
obj$getValue().
This method will first search for a get<Name>() method,
e.g. if name has the value "age", a getAge() will be
looked for. If such a method exists it will be called with the Class
as the first and only argument, e.g. getAge(this).
A get<Name>() is only looked for if <name> is not a
private field. A private field is a name beginning with a
. (period). The rational for this naming convention is to be
consistent with how ls() works, which will not list
such members by default.
If no such method exists, first then, this method will look a
field in the Class can has the name name.
If such neither exists, a method with name name will be
searched for and returned.
If no fields or methods are found at all, NULL is returned.
# S3 method for Class
$(this, name)
# S3 method for Class
[[(this, name, exact=TRUE)Returns the value of a field or a method (function).
If no such field or method exists, NULL is returned.
The name of the field or method to be accessed.
Henrik Bengtsson
For more information see Class.