DelphiInterface Template

System::DelphiInterface is a C++ implementation of the Delphi interface.

Pascal

DelphiInterface<class T> = class;

C++

template <class T>
class DelphiInterface;

File

systobj.h

Description

A Delphi interface is an abstract collection of properties, methods, and events with no implementation. It resembles a C++ class with only pure virtual methods. However a Delphi interface type supports built-in reference counting.

System::DelphiInterface is a C++ template that defines types compatible with Delphi interfaces, System::DelphiInterface defines reference counting logic in its initialization constructor, copy constructor, assignment operator, and destructor.

Note: Other operators that provide access to the underlying interface pointer do not handle reference counting. You may need to explicitly call AddRef or Release to ensure proper reference counting.

System::DelphiInterface is a template:

Copy Code

template <class T> class RTL_DELPHIRETURN DelphiInterface;

where the T parameter is an underlying interface class or COM interface. In the object framework, the resulting System::DelphiInterface class is usually given a name such as _di_IUnknown, where IUnknown is the name of the corresponding interface. Such interfaces are documented under the interface name (such as IFormDesigner).