Currently i try to understand the caveats from virtual inheritance better because i am thinking to usethem (delegate to sister class). I use the following example from https://isocpp.org/wiki/faq/multiple-inheritance
#include <iostream>
class Base {
public:
virtual void foo() = 0;
virtual void bar() = 0;
};
class Der1 : public virtual Base {
public:
virtual void foo();
};
void Der1::foo() {
bar();
}
class Der2 : public virtual Base {
public:
virtual void bar();
};
void Der2::bar() {
std::cout << "Der2::bar()" << std::endl;
}
class Join : public Der1, public Der2 {
public:
// ...
};
int main() {
Join* p1 = new Join();
Der1* p2 = p1;
Base* p3 = p1;
p1->foo();
p2->foo();
p3->foo();
}
With TDM-GCC-32 (gcc 4.9.2) i compile it with
g++ test.cpp -Wall -Wpedantic -o test.exe
and i get absolute no errors or warnings.
With MSVC-2013 (VS-12 Update 4) i get the following warnings
warning C4250: 'Join': Erbt 'Der1::Der1::foo' via Dominanz
Why does Visual Studio warn me and gcc not? Do i need to worry about warning C4250?
