[Pyrex] "Language Overview" confusion

[Robert Bradshaw]

Yes.

Technically, you don't even need to keep the imported variables/ 
functions in the right block (neither pyrex nor c would care), but  
that would make for confusing programming...

On Jun 5, 2007, at 4:34 PM, David Goldsmith wrote:

> John Machin wrote:
>> 1. If you start at the major heading "External Declarations", you  
>> will
>> see that the two declarations are what it has been talking about it
>> all along.
> I did start there but did not "see"...
>> 2. Consider that documentation that you read may have been written in
>> a dialect of English other than your own. It's perfectly clear to me,
> But I imagine you already knew what it was saying before you read it,
> i.e., I don't think it's a dialect problem, but rather a failure to  
> see
> what's written with the eyes of someone who has no idea what they're
> supposed to be doing.
>> but then I'm also from the Antipodes :-)
> "Antipodes" = "Down Under"?
>
> OK, from your previous email, I understand it thusly: the "cdef extern
> from ..." line is what generates the appropriate #include in the pyrex
> generated C file, but that's all it does; any variables and/or  
> functions
> from the header that one wants to use in the Pyrex file itself need to
> be declared in a block following that cdef line (and nowhere else),  
> but
> if one does *not* want to use *any* such variables/functions in the
> Pyrex file, then one can (must?) include a pass statement in the block
> followin the cdef extern from line.  In other words:
>
>   cdef extern from "spam.h": # this line adds the #include to the C  
> file
>
>     int spam_counter # this is only necessary if spam_counter is to be
> used in this Pyrex file, but if
>                                 # needed, it needs to be in this block
>
>     void order_spam(int tons) # ditto w.r.t. the function order_spam
>
>     pass # this is all I would need if I didn't need anything from
> spam.h in this Pyrex file
>
> Is this correct?  Thanks!
>
> DG
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