Double, default value

[Lajos Juhász 293]

9 minutes ago, A.M. Hoornweg said:

Static class methods are unable to access any members or methods that require a "self" parameter.  

As a result it can not be assigned to an event.

[A.M. Hoornweg 144]

24 minutes ago, Lajos Juhász said:

As a result it can not be assigned to an event.

Exactly. 

[Remy Lebeau 1405]

10 hours ago, dummzeuch said:

Alternatively one could create a plain procedure with the right signature, assign that to the code pointer of a TMethod record, leave the data pointer unassigned or set it to nil, and assign that record to the event using appropriate type casting.

That's the way I usually do it when I need an event handler without an object instance.

[mikerabat 20]

On 10/27/2024 at 8:25 AM, Olli73 said:

As local variable it is not initialized, as global it is.

This not entirely correct - all basic types aren't. Strings, interfaces and dynamic arrays are initialized to nil.

[JonRobertson 72]

52 minutes ago, mikerabat said:

Strings, interfaces and dynamic arrays are initialized to nil.

Often called managed types in Delphi code, because the compiler manages the lifetime of the heap memory used by those types.