struct interface_base
{
virtual void foo() = 0;
};
struct interface : virtual public interface_base
{
virtual void bar() = 0;
};
struct implementation_base : virtual public interface_base
{
void foo();
};
struct implementation : public implementation_base, virtual public interface
{
void bar();
};
int main()
{
implementation x;
}
Diamond inheritance and pure virtual functions
原文：https://www.cnblogs.com/ylron/p/14713777.html