[futurebasic] Re: [FB] CFIndexRead using FSRef

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From: Brian Stevens <bstevens33@...>
Date: Fri, 25 Jan 2008 18:09:07 -0700
On Jan 25, 2008, at 5:28 PM, Alain Pastor wrote:

> Brian Stevens a écrit :
>> On Jan 25, 2008, at 3:55 PM, Alain Pastor wrote:
>>> However, I don't know if FBtoC can handle all the possible  
>>> variants of the syntax.
>> .ref, ^ref @^ref are all handled in FBtoC
>>> As to the @ symbol, many programmers (among the best I must add)  
>>> use it as a reminder when calling Toolbox functions: it says that  
>>> this parameter variable will have its value updated by the  
>>> Toolbox function being called (besides that's why such a variable  
>>> must have an address in memory and therefore cannot be located in  
>>> a register). That symbol is optional in this case and I  
>>> personally don't use that syntax by laziness.
>> assume this refers to the the local fn (@x as ^something) syntax?  
>> versus the using it to obtain the address of something.
>> AFAIK, the difference between  local fn a (@x as ^something)   
>> versus  local fn b (x as ^something) is
>>  the former case can be called via fn a(x) and it knows to send  
>> the address of x without the programmer explicitly requesting it.
>> The latter syntax (except for structures) requires the fn b(@x)  
>> explicit passing of the address
> Yes, you're right, but I was discussing here only about Toolbox  
> calls for which it is not mandatory to explicitly pass the address  
> of a variable whose value will be updated by the called function  
> (FB does the work for us).
Yes, I wasn't sure if you were discussing toolbox calls. Thanks for  
the clarification Alain.

Brian S.