Questions tagged [cross-cast]

I have the following case in C++: Abstract base classes Abstract1 and Abstract2. They are unrelated. A class Foo deriving from both Abstract1 and Abstract2 I am in a compilation unit where I have no information about class Foo (no declaration, no…

I know that it's legal to use dynamic_cast to do a "cross-cast" across a class hierarchy. For example, if I have classes that look like this: A B \ / C If I have an A* pointer that's pointing at an object of type C, then I can use A*…

This is somewhat hypothetical as I'm not too worried about performance - just wondering which option is actually the fastest/most efficient in general, or if there is no difference whatsoever. Suppose I have the following code for a visitor template…

Consider this simple example: struct Base1 {}; struct Base2 {}; struct Derived : public Base1, public Base2 {}; int main() { Derived foo; Base1* foo1 = &foo; Base2* foo2 = static_cast(foo1); } I get: Error: static_cast from…