Advertisements The files are organized as following: //MyClass.h #pragma once namespace std { class ostream; }; class MyClass { private: int a; public: friend std::ostream& operator<<(std::ostream& o, const MyClass& obj); }; //MyClass.cpp #include<iostream> std::ostream& operator<<(std::ostream& o, const MyClass& obj) { o << obj.a << std::endl; return o; } //main.cpp #include"MyClass.h" #include<iostream> int main() { MyClass… Read More forward declaration of std::ostream

Advertisements I have a template that is just that – a very basic class template; something like: Tmpl.h template <typename Base> class Tmpl: public Base { public: Tmpl(): Base() { this->methodOfBase(); } }; I would like to be able to forward-declare specialized versions of this Templ. I typically just store a (shared) pointer, so in… Read More Forward declaring a specific template instance

Advertisements Why do I get an error when using a template method with a forward declared class? I don’t actually need a definition of this class, only a declaration. Or maybe I have misunderstood how it actually works? Do I really need to include a corresponding .h file of class B? Edited: And why then… Read More Forward Declaration using for a template method