封装(encapsulation) 继承(inheritance) 多态(polymorphism)。 就C++、Java 而言,OOP 的意思是利用类层级(class hierarchies)及虚函数进行编程。 从而可以通过精制的接口操作各种类型的对象,并且程序本身也可以通过派生(derivation)进行功能增量扩展。 举个Bjarne StroustrupFAQ 用过的栗子: 比如可能有两个(或者更多)设备驱...
虚函数(virtual function)、运算符重载(operator overloading)、多继承(multiple inheritance)、标准模板库(standard template library, STL)、异常处理(exception)、运行时类型信息(runtime type information)、名字空间(namespace)等概念逐渐纳入标准。1998年,国际标准组织(ISO)颁布了C++程序设计语言的第一个国际标准ISO...
In very rare cases, if you have measured that the dynamic_cast overhead is material, you have other means to statically guarantee that a downcast will succeed (e.g., you are using CRTP carefully), and there is no virtual inheritance involved, consider tactically resorting static_cast with a...
In the presence of virtual inheritance and multiple inheritance of a single base class, the actual dynamic cast must be able to identify a unique match. If the match is not unique, the cast fails. For example, given the additional class definitions: ...
The 1 code editor: syntax highlighting, auto indent The 2 code is compiled to run: direct local compile operation, does not need the network. The 3 can debug Support for C++ classes, inheritance, overloading, virtual function, characteristic template ...
Inheritance Hierarchy CObject CDaoWorkspace Requirements Header: afxdao.h CDaoWorkspace::Append Call this member function after you call Create. Copy virtual void Append(); Remarks Append appends a newly created workspace object to the database engine's Workspaces collection. Workspaces don't per...
Do not use inheritance when simply having a data member will do. Usually this means that the derived type needs to override a base virtual function or needs access to a protected member. 不要仅仅因为某个数据成员需要继承就使用继承。继承通常意味着派生类型需要覆盖某个基类的虚函数或者需要访问保护成...
virtual BOOL CanBeClosed() const; Return Value TRUE if the toolbar can be closed by the user; otherwise FALSE. Remarks The framework calls this method to determine whether the user can close a toolbar. If the method returns TRUE, the framework enables the SC_CLOSE command in the system...
Support for C++ classes, inheritance, overloading, virtual function, characteristic template With standard C and standard C++ Library Add Library posix, ipc, zlib, socket, sqlite3, jpeg, opengles1-3, Core Foundation(based iOS sdk7.0), Core Graphics(based iOS sdk7.0), UIKit(CCView,CCLabel,...
Inheritance HierarchyCObjectCCmdTargetCWndCBasePaneRequirementsHeader: afxbasepane.hCBasePane::AccNotifyObjectFocusEventCBasePane does not use this method.Copy virtual void AccNotifyObjectFocusEvent(int); Parametersint [in] Not used.CBasePane::AddPaneAdds...