QDTxMeasProcPtr

QDTxMeasProcPtr
Header:	Quickdraw.h		Carbon status:	Supported

typedef SInt16(* QDTxMeasProcPtr) (
    SInt16 byteCount, 
    Ptr textAddr, 
    Point *numer, 
    Point *denom, 
    FontInfo *info
);

You would declare your function like this if you were to name it MyQDTxMeasCallback:

SInt16 MyQDTxMeasCallback (
    SInt16 byteCount, 
    Ptr textAddr, 
    Point *numer, 
    Point *denom, 
    FontInfo *info
);