Subject: Re: iconv...
From: Mike Nordell (tamlin@algonet.se)
Date: Fri Nov 10 2000 - 16:35:30 CST
Dom Lachowicz wrote:
> Ok, sorry for breaking win32. Apparantly, the compiler can't convert a
"char
> **" to a "const char **" which seems silly to me. Does anyone have a
> suggestion for how to handle this?
Not at all. Well, yes, of course I have a solution, but not without
explaining the problem (the "silly part", whithout we wouldn't have a type
system in C++).
I think it's time for "types 101" now. :-)
A "char**" is a pointer to a "char pointer".
A "const char**" is the same as "char const**", which is a pointer to a
"const char pointer".
See the difference? A pointer to a "char pointer" _can't ever_ be
interchangeable with a pointer to a "const char pointer". These pointers are
pointing to two different _types_.
What _can_ be done is to convert those
char** p1
to
char* const * p2
That is, a pointer to a char pointer can be converted to a const pointer to
a char pointer.
Remember, "const char*" and "char*" are two _different types_. You can't
create pointers to those two types and expect them to be interchangeable.
(note: don't take my word for these examples, I've also been known to make
errors even in comp.lang.c++.moderated why I'd like your own judgement and
experiments be _your_ authority in this case).
/Mike
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