Name 

Description 

Overview of Generics 

Delphi supports the use of generics. 

Terminology for Generics 

 

Declaring Generics 

The declaration of a generic is similar to the declaration of a regular class, record, or interface type. The difference is that a list of one or more type parameters placed between angle brackets (< and >) follows the type identifier in the declaration of a generic.
Type parameters can be used as a typical type identifier inside the container type declaration and method body.
For example:  

Overloads and Type Compatibility in Generics 

 

Constraints in Generics 

Constraints can be associated with a type parameter of a generic. Constraints declare items that must be supported by any concrete type passed to that parameter in a construction of the generic type. 

Class Variable in Generics 

The class variable defined in a generic type is instantiated in each instantiated type identified by the type parameters.
The following code shows that TFoo<Integer>.FCount and TFoo<String>.FCount are instantiated only once, and these are two different variables.  

Changes in Standard Functions and Grammar 

Here is a list of standard function changes to support generics.
Example forms: