[PD] t_scalar member sc_vec

[Jonathan Wilkes]

Can anyone explain what's going on with this in m_pd.h:

typedef struct _scalar      /* a graphical object holding data */
{
    t_gobj sc_gobj;         /* header for graphical object */
    t_symbol *sc_template;  /* template name (LATER replace with pointer) */
    t_word sc_vec[1];       /* indeterminate-length array of words */
} t_scalar;

How is a static t_word array of size 1 an indeterminate-length array?  Is its placement as the last member of the struct required?

I see lots of mysterious casts in the internals of Pd's data structures.  What's the trick here, and is it documented anywhere on the interwebs, a C standard doc, etc.?

Thanks,
Jonathan
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