The control unit issues commands generating a key for encryption of the virtual function table pointer. The memory management unit generates a class ID from the class name. The memory unit stores the class name and the generated ID in a class ID table. The random key generation unit receives...
另一半机制,依赖于virtual table pointer。 只要一个class,声明了virtual function,就会自动有virtual table pointer。 一般它处于隐藏状态,指向对应类的 virtual table。 所以,定义了虚函数的类的对象,需要为额外的指针开辟空间。 如果对象很小,这个代价会很大。 比如如果你的对象平均只有4 Bytes的成员数据,那么额外的...
Creating a Virtual Function Table for a Stream Handler Creating an Object Pointer Obtaining the Address of a Virtual Function Table Creating a File-Handler Instance in a DLL Determining Which Interface an Object Supports Incrementing the Handler Reference Count Deleting an Object Custom File and...
虚函数(Virtual Function)是通过一张虚函数表(Virtual Table)来实现的。简称为V-Table。 baike.baidu.com|基于2149个网页 2. 虚拟函式 Linux文库 - 正文 - 英中繁简编程术语对照 ... view 视图virtual function虚拟函式虚函数 volatile 易挥发的、易变的 ? ... ...
Invoking a virtual function through a pointer-to-member function works as if the function had been called directly; the correct function is looked up in the v-table and invoked. Remarks The key to virtual functions working, as always, is invoking them through a pointer to a base class. (...
The compiler also adds a hidden pointer member to the most base class that uses virtual functions. Although the compiler does this automatically, we’ll put it in the next example just to show where it’s added: class Base { public: VirtualTable* __vptr; virtual void function1() {}; ...
function whose address is at offset 8 in the vtable. (Each pointer is 4 bytes, so the third pointer, func3, is at offset 8.) This is what makes virtual functions virtual: the call is indirect. C++ jocks say the function is bound at runtime, or late-bound (as a opposed to compile...
Consider for a moment what actually determines the virtual function set active for a class: the virtual table. How is that virtual table accessed, and therefore the active set of virtual functions determined? By the address to which the virtual table pointer [vptr] within the polymorphic object...
如果需要指定MM_SECURE_NO_CHANGE,则使用mmSecureVirtualMemoryEx而不是mmSecureVirtualMemory,以便在提供的视图中不允许进行保护更改。 此函数的返回值只能与MmUnsecureVirtualMemory一起使用。 驱动程序调用该例程以将范围返回到正常状态。 要求 要求价值 最低支持的客户端Windows 10 版本 1809 ...
pointer, called the vpointer (abbreviated as VPTR), which points to the VTABLE for that object. When you make a virtual function call through a base-class pointer (that is, when you make a polymorphic call), the compiler quietly inserts code to fetch the VPTR and look up the function ...