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I have two classes, Mesh and MeshList. I want MeshList to have a function that can change the private members of Mesh. But it won't compile and I don't know why. Here's my code. Mesh.h #ifndef _MESH_H #define _MESH_H #include "MeshList.h" #include <iostream> class Mesh { private: unsigned int vboHandle_; friend void MeshList::UpdateVBOHandle(); public: inline void Out() {std::cout << vboHandle_;} }; #endif Mesh.cpp #include "Mesh.h" MeshList.h #ifndef _MESH_LIST_H #define _MESH_LIST_H #include "Mesh.h" class MeshList { public: Mesh *mesh; //Line 11 Error void UpdateVBOHandle(); }; #endif MeshList.cpp #include "MeshList.h" void MeshList::UpdateVBOHandle() { *mesh->vboHandle_ = 4; } I get these errors: MeshList.h (Line 11) error C2143: syntax error : missing ';' before '*' error C4430: missing type specifier - int assumed. Note: C++ does not support default-int error C4430: missing type specifier - int assumed. Note: C++ does not support default-int mesh.h(11) : error C2653: 'MeshList' : is not a class or namespace name meshlist.cpp(5) : error C2248: 'Mesh::vboHandle_' : cannot access private member declared in class 'Mesh' mesh.h(10) : see declaration of 'Mesh::vboHandle_' mesh.h(8) : see declaration of 'Mesh' meshlist.cpp(5) : error C2100: illegal indirection

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