Compiler Error C2530

'identifier' : references must be initialized

A reference was not initialized when it was declared.

The following cases are the only times a reference can be declared without initialization:

• It is declared with the keyword extern.
  
  
• It is a member of a class, structure, or union and is initialized in the class's constructor function.
  
  
• It is declared as a parameter in a function declaration or definition.
  
  
• It is declared as the return type of a function.