Top "Forward-declaration" questions

Forward declarations allow statically-typed programs to indicate the type and name of a symbol without actually defining it.

C++ nested class/forward declaration issue

Is it possible to forward-declare a nested class, then use it as the type for a concrete (not pointer to/…

c++ forward-declaration nested-class
Should one use forward declarations instead of includes wherever possible?

Whenever a class declaration uses another class only as pointers, does it make sense to use a class forward declaration …

c++ forward-declaration
Why does a C++ friend class need a forward declaration only in other namespaces?

Suppose I have a class F that should be friend to the classes G (in the global namespace) and C (…

c++ namespaces friend forward-declaration
Forward Declaration vs Include

Consider the following two scenarios (Edited just to complete the whole question and make it clearer) Case 1: (doesnt compile as …

c++ class forward-declaration
How to forward declare a member function of a class to use in another class?

I have made two identical classes X and Y, with a pointer to each other. See the code below for …

c++ forward-declaration
Objective C - Error: 'Expected a type'

I'm getting a very strange error on something that I would have thought to be simple. #import <Foundation/Foundation.…

objective-c import header-files forward-declaration circular-dependency
Forward function declarations in a Bash or a Shell script?

Is there such a thing in bash or at least something similar (work-around) like forward declarations, well known in C / …

bash function sh forward-declaration
What is a parameter forward declaration?

I thought I knew C syntax quite well, until I tried to compile the following code: void f(int i; …

c syntax parameters forward-declaration
Forward Declaring enum class not working

In State.h I have enum class StateID : unsigned int; In State.cpp I have enum class StateID : unsigned int { …

c++ c++11 forward-declaration enum-class
Templates: Use forward declarations to reduce compile time?

I have to deal with a library that consists of many templated classes, which are of course all implemented in …

c++ templates linker compilation forward-declaration