Classes: Type Constants
Type constants provide a way to abstract a type name. However, type constants only make sense in the context of interfaces and inheritance hierarchies, so they are discussed under those topics.
For now, the declaration of a type constant involves the keywords const type
. Without explanation, here's an example:
abstract class CBase {
abstract const type T;
// ...
}
class CString extends CBase {
const type T = string;
// ...
}
A type constant has public visibility and is implicitly static.
By convention, type constant names begin with an uppercase T
.
See inheritance and type constants revisited for more information.
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