Delphi class reference

Source: Internet
Author: User

When talking about the reference of the Delphi class, I mentioned in <Delphi Technical Manual>:
An object is a memory block used to store the values of each field of a class.
Object Reference is the pointer to this object.
The class table is used to store read-only pointers and related information pointing to VMT.
Class reference is the pointer to this class table

It is defined as follows:

  1. Tclass = Class of type;
  2. // Example
  3. Tclass = Class of tobject;

The tobject class type is as follows:

  1. Function tobject. classtype: tclass;
  2. Begin
  3. Pointer (result): = ppointer (Self) ^;
  4. End;

Ppointer (Self) ^ should be equal
Pointer (pointer (Self) ^), Self is an instance pointing to an object,

The first four bytes of an object are a pointer to the VMT table, that is, ppointer (Self) ^ is a pointer to the virtual method table (VMT.

PS: In a common method, self indicates the instance of the class, and in the class method, self indicates the class itself.

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