Edward L. Fox wrote:
> Hi Tony,
>
> On 8/16/07, Tony Mechelynck <[EMAIL PROTECTED]> wrote:
>> Chris Sutcliffe wrote:
>>> Replied direct to Bram instead of the list...
>>>
>>> On 8/15/07, Chris Sutcliffe wrote:
>>>>> Adding (char *) casts for things that are already character strings?
>>>>> Isn't this a problem in gcc?
>>>> GCC complains that const char*'s is being passed as a char*'s (because
>>>> it's a contant string being passed in the quotes), so I re-cast it as
>>>> a (char*) to get rid of the warnings.
>>>>
>>>> Basically because, for example, searchpath(char *) is defined to take
>>>> a char* argument and "gvim.bat" is considered a constant char*, there
>>>> is a mismatch in argument types (which GCC 4 is a little more adamant
>>>> about, since I believe one of GCC 4's goals is to be more standards
>>>> compliant).
>>>>
>>>> Cheers!
>>>>
>>>> Chris
>>>>
>>>> --
>>>> Chris Sutcliffe
>>>> http://ir0nh34d.googlepages.com
>>>> http://ir0nh34d.blogspot.com
>>>> http://emergedesktop.org
>>>>
>>>
>> shouldn't the function take const char * as arguments instead? Meaning it
>> doesn't modify that argument even though it's a pointer.
>
> Yes, I think so. Const-correctness is always a big problem. The old
> version of C without ++ doesn't support "const". So many C progammers
> are not familiar with the const keyword.
>
> Any way, it seems that you also misunderstood the const keyword.
> "const char *" means "a pointer points to const char", so you are not
> able to modify the pointed content, but the pointer itself is still
> modifiable. For example, you could say:
>
> const char *p;
> ...
> ++p;
>
yes, yes; I mean, with a const argument you can't pass back modified
pointed-to data to the calling routine, while with ordinary pointers (without
const) you can. I guess I should have said the function won't modify the
argument (the string) even though it is passed by address (not by value as
most numeric single-item values can be passed).
Best regards,
Tony.
--
Hartley's Second Law:
Never sleep with anyone crazier than yourself.
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