Why do I get this error : C2143 syntax error: missing ',' before '&'?

Question

Everything was going well until I added the drow function into Renderer.h file

void Drow(const VertexArray& va, const IndexBuffer& ib, const Shader& shader)const;

Renderer.h :

#include <GL\glew.h>
#include"Shader.h"
#include"VertexArray.h"
#include"IndexBuffer.h"


#define ASSERT(x) if(!(x))__debugbreak();
#define GLCall(x) GLClearError();\
    x;\
    ASSERT(GLlogCall(#x, __FILE__, __LINE__))

/*function to clear all last errors in opengl*/
void GLClearError();

/*function to print all errors */
bool GLlogCall(const char* function, const char* file, int line);

class Renderer {
public:
    void clear()const;
    void Drow(const VertexArray& va, const IndexBuffer& ib, const Shader& shader)const;

};

When I try to build it I get this error in visual studio 2015 :

Error   C2143   syntax error: missing ',' before '&'    

and this one

Error   C4430   missing type specifier - int assumed. Note: C++ does not support default-int        

I could not figure out why !

Answer 1

the problem was that VertexArray, IndexBuffer or Shader header files were including Rendered.h file so I had circular dependencies like this :

Renderer.h

#include"Shader.h"
#include"VertexBuffer.h"
#include"IndexBuffer.h"

class Renderer{
public:
// some code
    void Drow(const VertexArray& va, const IndexBuffer& ib, const Shader& shader)const;
}

and Shader.h ,VertexBuffer.h,IndexBuffer.h files have this code:

#include"Renderer.h"
class className{
//  code
}

so I used the forward declaration and included the headers to cpp file and files have become this way Renderer.h

#include <GL\glew.h>

class Shader.h;
class VertexBuffer.h;
class IndexBuffer.h;

class Renderer{

public:

//  code
    void Drow(const VertexArray& va, const IndexBuffer& ib, const Shader& shader)const;
}

Renderer.cpp

#include "Renderer.h"
#include<iostream>

#include"Shader.h"
#include"VertexArray.h"
#include"IndexBuffer.h"

// the rest of code

and Shader.h ,VertexBuffer.h,IndexBuffer.h files have this code:

//still have
#include "Renderer.h"
class className{
//  code
}