difference between calloc() and malloc()
13  2510 
On Wed, 13 Feb 2008 20:49:47 +0100, manish sahu <ro********@yah oo.com>
wrote:
difference between calloc() and malloc()
RTFM
On Feb 13, 1:49 pm, manish sahu <rocky_m...@yah oo.comwrote:
difference between calloc() and malloc()
You shouldn't be using either one in C++ if you can help it. Use
operator new instead.
On Feb 13, 11:56 am, Christopher <cp...@austin.r r.comwrote:
On Feb 13, 1:49 pm, manish sahu <rocky_m...@yah oo.comwrote:
difference between calloc() and malloc()
You shouldn't be using either one in C++ if you can help it. Use
operator new instead.
new constructs objects but malloc and calloc reserve raw memory;
different...
Ali ac******@gmail. com wrote:
On Feb 13, 11:56 am, Christopher <cp...@austin.r r.comwrote:
>On Feb 13, 1:49 pm, manish sahu <rocky_m...@yah oo.comwrote:
>>difference between calloc() and malloc()
You shouldn't be using either one in C++ if you can help it. Use
operator new instead.
new constructs objects but malloc and calloc reserve raw memory;
different...
Well, malloc and calloc are just 'new char[]' and 'new char[]()'.
They don't "reserve raw memory" since there is no "raw memory" in
C++.
V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask
On Feb 13, 12:42 pm, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:
acehr...@gmail. com wrote:
On Feb 13, 11:56 am, Christopher <cp...@austin.r r.comwrote:
On Feb 13, 1:49 pm, manish sahu <rocky_m...@yah oo.comwrote:
>difference between calloc() and malloc()
You shouldn't be using either one in C++ if you can help it. Use
operator new instead.
new constructs objects but malloc and calloc reserve raw memory;
different...
Well, malloc and calloc are just 'new char[]' and 'new char[]()'.
They don't "reserve raw memory" since there is no "raw memory" in
C++.
With "raw memory," I meant the allocated storage that allocators
allocate; you know, to construct objects on... I don't keep a copy of
the standard any more, but I'm pretty sure it talks about storage. I
regret now that I called that "raw memory"...
On your point about using new[] for storage, it is misguided. Because
new char[] allocates uninitialized chars and new char[]() allocates
initialized chars. The behaviour is quite different than allocating
storage to construct objects on. It is possible to construct object on
tops of chars, but it's a side effect of chars having trivial
destructors.
Ali
On Feb 13, 1:46 pm, acehr...@gmail. com wrote:
On your point about using new[] for storage, it is misguided. Because
new char[] allocates uninitialized chars and new char[]() allocates
initialized chars.
Even though I typed "allocates" twice above, I meant "constructs "
twice. My point below is that new[] constructs chars.
The behaviour is quite different than allocating
storage to construct objects on. It is possible to construct object on
tops of chars, but it's a side effect of chars having trivial
destructors.
Ali
manish sahu <ro********@yah oo.comwrote:
difference between calloc() and malloc()
From http://www.dinkumware.com/manuals/default.aspx
calloc
void *calloc(size_t nelem, size_t size);
The function allocates an array object containing nelem elements each of
size size, stores zeros in all bytes of the array, and returns the
address of the first element of the array if successful; otherwise, it
returns a null pointer.
malloc
void *malloc(size_t size);
The function allocates an object of size size, and returns the address
of the object if successful; otherwise, it returns a null pointer.
See the difference?
On Feb 13, 9:42 pm, "Victor Bazarov" <v.Abaza...@com Acast.netwrote:
acehr...@gmail. com wrote:
On Feb 13, 11:56 am, Christopher <cp...@austin.r r.comwrote:
On Feb 13, 1:49 pm, manish sahu <rocky_m...@yah oo.comwrote:
>difference between calloc() and malloc()
You shouldn't be using either one in C++ if you can help it. Use
operator new instead.
new constructs objects but malloc and calloc reserve raw memory;
different...
Well, malloc and calloc are just 'new char[]' and 'new
char[]()'. They don't "reserve raw memory" since there is no
"raw memory" in C++.
That's not true. Raw memory is what exists between the moment
the memory is allocated, and the moment the constructor is run,
or between the moment the destructor finishes and the moment the
memory is freed. Call reserve() on an empty std::vector, and
that vector will contain raw memory.
The way raw memory is usually allocated in C++ is by calling the
operator new() function. malloc() can also be used. calloc()
should probably be avoided, both in C and in C++, because it
masks a number of serious errors.
--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
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James Kanze wrote:
The way raw memory is usually allocated in C++ is by calling the
operator new() function. malloc() can also be used. calloc()
should probably be avoided, both in C and in C++, because it
masks a number of serious errors.
What are the problems with calloc? Googling "calloc errors" and
"problems with calloc" did not turn up anything obvious. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Koster |
last post by:
Sorry for the re-post, but my previous question was left unanswered.
I have a question about the appropriateness of calloc. Consider an array of
pointers to structs which need to be allocated space on the heap, for example:
typedef struct myStruct *PMYSTRUCT;
struct myStruct
{
int i;
int j;
|
by: rihad |
last post by:
To make up a proper dynamically allocated empty C string, would it suffice to
say:
return calloc(1, 1);
or am I better off using the longer version
char *p = malloc(1);
if (p) *p = 0;
return p;
|
by: MK |
last post by:
I am a newbie. Please help. The following warning is issued by gcc-3.2.2
compiler (pc Linux):
==================================================================
read_raw_data.c:51: warning: assignment makes pointer from integer
without a cast
==================================================================
when the following piece of code was compiled. The offending statement
is calloc. A similar statement in the main() function...
|
by: Mohanasundaram |
last post by:
Hi All,
What is the difference between malloc and calloc other than the
point that calloc will initialize the memory to all zeros? This was an
interview question for me. All the books and references that I have
come across tells that calloc initialize the memory to all zeros. In
Herbert Shiltd's C/C++ reference I found that calloc returns a pointer
to an array. I want to understand in what way the memory returned by
malloc and calloc...
|
by: brian |
last post by:
I went through my implementation's (BSD) source code for
calloc(), and if no more than one object is being allocated,
the code will still execute the following if() (from
/usr/src/lib/libc/stdlib/calloc.c):
if (num && size && SIZE_T_MAX / num < size) {
errno = ENOMEM;
return NULL;
}
| | |
by: Harsimran |
last post by:
Can any one explain what are far pointers and what is the difference
between malloc and calloc .Which is better ?
|
by: lohith.matad |
last post by:
Hi all,
Though the purpose of both malloc() and calloc() is the same, and as we
also know that calloc() initializes the alloacted locations to 'zero',
and also that malloc() is used for bytes allocation whereas calloc()
for chunk of memory allocation.
Apart from these is there any strong reason that malloc() is prefered
over calloc() or vice-versa?
Looking forward for your clarrifications , possibly detailed.
|
by: venkatesh |
last post by:
hai to everybody,
i am having doubt in difference between the malloc
and calloc function.
please tell where to use and when to use those functions?
|
by: mthread |
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Hi,
I am learning C++ and I have been told that an object can be
created either by using calloc or new. If it is true, can some one
tell me what is the difference b/w using these two function calls.
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