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Allocating memory for strings

 
 
David Thompson
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      10-22-2007
On Sun, 07 Oct 2007 16:35:29 +0200, Army1987 <(E-Mail Removed)>
wrote:

> On Sat, 06 Oct 2007 13:07:24 -0700, Keith Thompson wrote:
>
> > Except that string literals aren't const. (Attempting to modify a
> > string literal invokes undefined behavior, but only because the
> > standard explicitly says so.) It would be better if string literals
> > *were* const, but that would have broken existing code back in 1989
> > when the ANSI standard first introduced the "const" keyword.


> They could have made string literals const while allowing implicit
> conversion of const char * to char *,


That would have been much _more_ dangerous; it would allow undetected
screwups even for program(mer)s that went to the effort of using
(adding) the new 'const' qualification. Even if you limited it to
occurring during decay, const char [] to char *, as C++ does.

C++ doesn't actually solve the problem for C strings, and really
can't. What it does do is provide a whole new set of std::*string's,
with lots of new features including correct constificationosity.

> and make the return type of
> strchr, strstr etc. const char *, as in C++.


No, in C++ there are BOTH const and nonconst versions, overloaded.
Which C++ can easily do because it already needed and had overloading.
C89 didn't, and the committee apparently judged that adding it just
for this would have been overkill. Although a decade later they did
require effective overloading, at least of builtins, for <tgmath.h>.

- formerly david.thompson1 || achar(64) || worldnet.att.net
 
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