On Thu, Feb 12, 2015 at 11:02:06AM -0800, Alex Wang wrote:
> > + struct mac_learning_port *mlport;
>
>
> Simple C question, why don't we need to forward declare the struct
> 'mac_learning_port'?
Forward declarations are only necessary in one weird C corner case: when
the first use of the struct tag is in a function parameter. So:
void f(struct foo *);
requires a forward declaration if this is the first use of struct foo.
But:
struct bar { struct foo *x; };
or
struct foo *f(void);
doesn't. It's a weird rule and I wonder whether the C committee thought
it through properly back in the late 1980s. Out of curiosity I took a
quick look through the C standard rationale for a mention of this topic,
but I don't see one.
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