[Simh] IO functions

[Rhialto]

On Sat 27 Jun 2015 at 21:03:33 -0400, Bill Cunningham wrote:
>  
> void (*sim_vm_init) (void)
> 
> Well what is this. The function returns nothing and takes nothing
> right? What's the *sim_VM_init in parenthesis referring too? That's my
> question. 

This is a basic C FAQ.  It means that sim_vm_init is a pointer (to a
function).

An alternative way of reading it is as follows:

if

    void f(void);

declares a function, then this does too:


    void (*g)(void);

where *g is the function. In other words, g is a pointer to a function.

See http://c-faq.com/decl/cdecl1.html for a bit more extended
explanation of C declaration syntax.

-Olaf.
-- 
___ Olaf 'Rhialto' Seibert  -- The Doctor: No, 'eureka' is Greek for
\X/ rhialto/at/xs4all.nl    -- 'this bath is too hot.'
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