Delphi - 从类和接口继承(适配器模式)? [英] Delphi - inherit from a class and an interface (adapter pattern)?
问题描述
我正在尝试执行GoF适配器模式,并且在C#示例中,我遵循Adapter类继承原始类和适配接口。
在Delphi(2007)中,据我所知,这是不可能的,或者是这样吗?如果一个类继承一个接口,它需要继承TInterfacedObject,因为Delphi不允许多个类继承,这就是故事的结尾。我不能同时从自定义类和接口继承。
I am trying to do the GoF adapter pattern and in the C# example that I am following the Adapter class is inheriting the original class and an adapting interface. In Delphi (2007), as far as I know, this is not possible, or is it? Cause if a class is inheriting an interface, it needs to inherit from TInterfacedObject and since Delphi doesn't allow multiple class inheritance, that is the end of story. I cannot inherit from a custom class and an interface at the same time.
我是否正确?
谢谢你。
我在 http://delphipatterns.blog.com/2011/02/22/decorator-5/
推荐答案
不,这不正确。您可以将接口添加到您喜欢的任何类中,如下所示:
No that it not correct. You can add an interface to any class you like as follows:
type
IAdapter = interface
procedure DoSomething;
end;
TAdapter = class(TBaseClass, IInterface, IAdapter)
private
FRefCount: Integer;
procedure DoSomething;
protected
function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
function _AddRef: Integer; stdcall;
function _Release: Integer; stdcall;
end;
function TAdapter.QueryInterface(const IID: TGUID; out Obj): HResult;
begin
if GetInterface(IID, Obj) then
Result := 0
else
Result := E_NOINTERFACE;
end;
function TAdapter._AddRef: Integer;
begin
Result := InterlockedIncrement(FRefCount);
end;
function TAdapter._Release: Integer;
begin
Result := InterlockedDecrement(FRefCount);
if Result = 0 then
Destroy;
end;
procedure TAdapter.DoSomething;
begin
end;
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