Forward declare a function/task...

How do I forward-declare a function to avoid `NameError`s for functions defined later?...

Why does this code compile without forward declaration of my struct?...

Mutually dependent constexpr constructors...

What is the difference between forward declaration and forward reference?...

Forward Declaration using for a template method...

How to forward declare a template function in global or namespace with default argument?...

What is the purpose of having the forward declarations in the given fragment of C code?...

Forward declaration of objects with STL containers...

Is it required to define all forward declarations?...

Forward declaration of class and still Error: Variable has incomplete type...

How to achieve forward declaration of class template...

receiver type *** for instance message is a forward declaration...

How do you forward declare header files?...

Forward declare a struct in C...

Allowing access to protected member function for class outside of namespace...

Does forward declaration fully remove the need for any #including for pointer types?...

mutually dependent local classes (or mutually recursive lambdas)...

Are function propotypes obsolete in c++...

In C++, how do I fix a pointer class's variable becoming a nullptr when I call it?...

Is the size of an object needed for creating object on heap?...

invalid application of ‘sizeof’ to incomplete type...

Avoiding circular references with forward declarations, but unable to access class members...

Calling member method of cyclic dependent classes...

Error in making Template with Forward Declaration of functions in C++...

Default parameters and forward declaration...

C++ Two Classes Template Methods Reference (Not Compose) Each Other...

Redefinition of 'ClassName' as different kind of symbol in generated header...

C++: How can I forward-declare derived classes that appear in a static method of a base class?...

Unexpected template instantiation when passing a pointer argument...