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"A type cannot be introduced in a function parameter list"

user46741 Published in September 19, 2018, 9:08 am

I'm using the Bullet physics library in a C++ program on Visual Studio. When I turn off the Visual Studio language extensions I cannot get the Bullet physics library to compile, I get the error:

'btSerializer': a type cannot be introduced in a function parameter list

And brings me to the line:

virtual const char* serialize(void* dataBuffer, class btSerializer* serializer) const;

The documentation for these functions are here:


Edit: Verifiable example, what is happening here?

class Bar
    void serialize(void* dataBuffer, class btSerializer* serializer) ;

int main()


If Visual Studio language extensions are on, it compiles fine. If I turn it off it emits the same error as I mentioned above. Also, if I eliminate the first argument of the void pointer, so that the function has only the btSerializer* argument it compiles fine. So for example:

class Bar
    void serialize(void* dataBuffer, class btSerializer* serializer) ;

Emits the error:

'btSerializer': a type cannot be introduced in a function parameter list


class Bar
    void serialize(class btSerializer* serializer) ;

Compiles fine.

Also, a forward declaration of class btSerializer; makes the error go away.

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  • 1
    Have you tried deleting the class keyword as in virtual void serializeSingleObject(btSerializer* serializer) const; – Dr Yunke Feb 14 at 6:31
  • Minimal, Complete, and Verifiable example please. I can't reproduce it. So I have no way to know if it's a compiler bug or my attempt is wrong. – StoryTeller Feb 14 at 6:31
  • @Dr Yunke, I tried, same thing. I'm trying to make verifiable example but each header depends on many other headers and I'm having trouble. – Zebrafish Feb 14 at 6:45
  • You need class btSerializer declared (possibly forward-declared) before you can mention it in a function parameter. – n.m. Feb 14 at 6:48
  • 1
    @Zebrafish it does look like a compiler bug. – n.m. Feb 14 at 9:00

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