While making a function virtual in c++ where do I have to write virtual
keyword?
In the function declaration, before the function name, and after any attribute specifiers, along with the other specifiers (including the type specifier for the function's return type).
The general syntax for a declaration is
simple-declaration:
decl-specifier-seq<opt> init-declarator-list<opt> ;
attribute-specifier-seq decl-specifier-seq<opt> init-declarator-list ;
where both virtual
(a function-specifier) and the return type (a type-specifier) are part of the decl-specifier-seq, and the name being declared is part of the init-declarator-list.
Does it make a difference if I write virtual int function_name
instead of int virtual function_name
No, the order of the specifiers makes no difference.
However, you might surprise some people if you put virtual
after the type specifier, since it's more common to put it before. I didn't know you could do that until I answered this question.
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