Re: I'm a newbie. Is this code ugly?

Richard Herring <junk@[]>
Fri, 22 Jan 2010 10:07:09 +0000
In message <4b594ee2$0$1115$>, io_x
<a@b.c.invalid> writes

"Richard Herring" <junk@[]> ha scritto nel messaggio

In message <4b57ff58$0$1135$>, io_x
<a@b.c.invalid> writes

char* faiMemCopia(char* v)

Why are you (badly) reinventing strcpy() ?

{int i, n;
char *p;
if(v==0) R 0;
if(n<=0) R 0;

Why? There's nothing intrinsically wrong with a zero-length string.

yes here i would say "if(n<0) R 0;"

And under what circumstances would strlen() ever return a negative value?

it seems strlen() here returned one unsigned type: size_t
here size_t is "unsigned int" of 32 bit but this means
strlen can return 0xF0000000 that is a negative number
seen it like int;

Only because you are perversely choosing to cast it to a signed type
when it is not.

and for me that negative number is not ok

So you should be declaring the variable n as size_t, not int.


what i can do is
p=(Y*) malloc(sizeof(Y));
for deallocate it

The C++ way to do that is:

p = new Y;
/* ... */

delete p;

and the constructor and destructor of Y will be called without any work on
your part.

thank you, i did not think about that, thanks

why the default operator delete
has one argument of type size_t?

It doesn't. A class-specific operator delete may have a second argument
of type size_t.

void operator delete(void*, size_t);

there is something hidden in the call delete?

Don't confuse the delete expression "delete p;" with the deallocation
function named "operator delete()". They do different things.

for example here
T a(1,1,1);
T *p=new T(a)

Why the unnecessary copy? Just write:

T * p = new T(1,1,1);

delete p;

[snip horrid C-style code]

Richard Herring

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