I have a class template derived from another class template, derived from a third class template. All have an empty default constructor, and an empty virtual destructor.
Using MSVC 2019, compiling for x64, c++17
When I run Visual Studio’s built-in static analysis, I get the following 2 warnings:
Warning C26434 Function 'Derived1<T,T,double>::Derived1<T,T,double>' hides a non-virtual function 'Base<T,T,double>::Base<T,T,double>'.
Warning C26434 Function 'Derived2<T,T,double>::Derived2<T,T,double>' hides a non-virtual function 'Derived1<T,T,double>::Derived1<T,T,double>'.
Might be of note that I don’t see them when compiling in Debug, only Release (/O2)
This also happens for a second existing class hierarchy.
I was not aware that it was even possible to hide a constructor, which could never be virtual to begin with?
Are these some weird false positives or is there something sinister going on?
#include <iostream>
template <typename A, typename B, typename C>
class Base
{
public:
Base() {}
virtual ~Base() {}
};
template <typename A, typename B, typename C>
class Derived1 : public Base<A,B,C>
{
public:
Derived1() {}
virtual ~Derived1() {}
};
template <typename A, typename B, typename C>
class Derived2 : public Derived1<A,B,C>
{
public:
Derived2() {}
virtual ~Derived2() {}
};
class T {};
int main() {
Derived2<T,T,double> d;
std::cout << sizeof(d) << "\n"; // to prevent optimizing away the instantiation
return 0;
}