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This the problem When i register a callback using the gluNurbsCallback(theNurb, GLU_NURBS_VERTEX , vertexCallback ); where 1. theNurb is a GLUNurbsObj 2.vertexCallback is of type void vertexCallback( GLfloat* ) funtion i get the following error error: invalid conversion from `void (*)(GLfloat*)' to `GLvoid (*)()' error: initializing argument 3 of `void gluNurbsCallback(GLUnurbs*, GLenum, GLvoid (*)()) This happens only when the file is saved as a CPP file . The same call back register works fine when i save it in a C file. What could be the problem ?

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