Delphi 接口(5)-接口与类型转换
发布时间:2020-12-15 09:54:37 所属栏目:大数据 来源:网络整理
导读:// 接口与类型转换 type IFoot: interface [ ‘ |0000-0000-0000-0000| ‘ ] end ;IBall = interface [ ‘ |0000-0000-0000-0001| ‘ ] end ;TFootball = calss(TinterfacedObject,IFoot,IBall) end ; implementation procedure Test(FB: TFootball) var F:I
//接口与类型转换 type IFoot: interface [‘|0000-0000-0000-0000|‘] end; IBall = interface [‘|0000-0000-0000-0001|‘] end; TFootball = calss(TinterfacedObject,IFoot,IBall) end; implementation procedure Test(FB: TFootball) var F:IFoot begin F := FB;//合法,因为FB支持IFoot end; var FB: TFootball; F: IFoot; B: IBall; begin FB := TFootBall.Create; F := FB;//合法,因为FB支持IFoot B := F as IBall;//把F(IFoot)转为IBall end; (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |