Apple also repeats this pattern in some of their sample code like
this.
typedef struct {
GLdouble x,y,z;
} recVec;
You can always do:
NSPoint p;
glVertex2fv((float *)&p);
revVec v;
glVertex3fv((float *)&v);
Just to be pedantic...
Better call:
glVertex3dv((double*)&v)
on that second example, or you will get garbage...
You can also use the following forms:
glVertex2fv( &p.x );
glVertex3dv( &v.x );
which might be more compact.
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