Foundation Kit-Wrapper Class-NSValue

• NSValue is a simple container for a single C or Objective-C data item.

• It can hold primitives data types, as well as pointers, structures, and object id.

• The purpose of this class is to allow items of such data types to be added to collections such as instances of NSArray and NsSet, which require their elements to be objects.

• NSValue objects are always immutable.