在C++中,“conversion to inaccessible base class is not allowed”这个错误通常与类的继承权限和类型转换有关。下面我将逐一解释你提到的几个方面: 1. 解释“inaccessible base class”的含义 在C++中,如果一个基类(base class)对于派生类(derived class)或者外部代码来说是不可访问的,那么这个基类就被称为“inac...
26A *a3=d;//why do classes derived from B can sucessfully convert to A here? 原因同上27}28voidgg(D*d){29A* a=d; // 这里也会报错,同上30}31intmain(){32B b;33C c;34D d;35A a;36gg(&d);//error: 'A' is an inaccessible base of 'D'37a.ga(&b,&c,&d);38b.gb(&b,&c,...
There is one thing you can do with a C-style cast that you can’t do with C++ casts: C-style casts can convert a derived object to a base class that is inaccessible (e.g. because it was privately inherited). static_castshould be used to cast most values ...
b)static_cast<target-type>(expression), with extensions: pointer or reference to aderived classis additionally allowed to be cast to pointer or reference to unambiguous base class (and vice versa) even if the base class isinaccessible(that is, this cast ignores the private inheritance specifier)...
type isreference-compatiblewith the type ofexpression,static_castconverts the value ofglvalue, class prvalue, or array prvalue(until C++17)any lvalue(since C++17)expressionto xvalue referring to the same object as the expression, or to its base class subobject (depending ontarget-type).[1]...
EML to PST Converter Software Specification System Requirement Hard Disk Space 100 MB of free space for software installation RAM 512 MB Minimum Processor Any Pentium Class Operating System Windows 98, XP, Vista, Windows 7/8/8.1, Windows 10 (32-bit & 64-bit) Product Guide Installation...
// C++ program to demonstrate // static_cast in case of // private inheritance #include <iostream> using namespace std; class Base {}; class Derived: private Base { // Inherited private/protected // not public }; // Driver code int main() { Derived d1; // Implicit type cast allowe...
Using a Web form or user control as a base class to another Web form or user control. Using LoadControl() and casting the result to another user control, for example UserControl1 c1 = (UserControl1)LoadControl("~/UserControl1.ascx"); Creating an instance of the Web form class, for ...
Both interfaces have all the public members of its base class (System.Object). They do not contain the private or internal members of the class. Each member is automatically assigned a unique DispId. The DispIds can be set explicitly by applyingDispIdAttributeto the member of the class. ...
2)Iftarget-typeis “pointer to (possibly cv-qualified)Base” and the type ofexpressionis “pointer to (possibly cv-qualified)Derived” such thatBaseis a base class ofDerived, the result is a null pointer value ifexpressionis a null pointer value, or ...