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Virtual function (virtual function) vtbl (virtual function table) and vptr (virtual function table pointer)Virtual function table (VirtualTa

Principle AnalysisWhen a virtual function is called, the compiler-generated code calls a function such as the virtual table address [0] (param1, param2). The function name is not already being called.When we change the function implementation in the virtual table address [n]

Tag: Virtual table virtual pointer for C + + virtual functionVirtual functionsA virtual function is virtual a function that is used to modify. Virtual function is the basis of implement

]//arg0=8. text:08048544, FF FF FF mov [EBP+VAR_DC], eax//var_dc=-0xdcAfter that, the function allocates the position of the function in the stack frame of the local variable, then executes strcpy (BUF,SRC) and then calls the virtual function Vir2 (), we mainly analyze this piece of code:. text:08048576 8B FF FF FF mov eax, [EBP+VAR_DC]//Assign a virtual pointer address to EAX. text:0804857c 8B mov eax, [EA

From the example, examine the object memory model of the class with the virtual function as follows:1 classA {2 Public:3 Virtual voidvfunc1 ();4 Virtual voidVfunc2 ();5 voidfunc1 ();6 voidFunc2 ();7 Virtual~A ();8 Private:9 intm_data1, M_data2;Ten }; One A classb:a { - Public: -

C ++ virtual functions and virtual function table Parsing1. Definition of virtual functions A virtual function must be a non-static member function (and a non-constructor) of the class. Its access permission can be defined as private or proteceted, but it is meaningless for

class to the derived class, which is designed to ensure that the object is successfully built. The constructor also undertakes the establishment of the virtual function table, and if it is a virtual function, how to ensure the success of the VTBL construction? 　　Note: What happens when a virtual function is inside th

The address of the virtual function is not necessarily saved in the virtual function table. I always thought that the address of the virtual function is saved in the virtual function table. I did not find this idea correct when

Concept: Virtual functions (virtual function) are implemented by a virtual function table (virtual table), referred to as v-table. The role of learning

Recently, I read the memory layout of objects with virtual inheritance levels in the inside C ++, and found that the implementations in different compilers are different. Therefore, I explored it myself. The result is as follows:First, let's talk about the GCC compiler.It is easy to implement. No matter whether it is virtual inheritance or not, GCC shares the virtual