«

hack_tick <> spoke thus:

> struct Tmp
> {
> int iVar[20] : 1; // each element of Aray having size as 1-BIT
> }

> any suggestions ???

Yes - vector<bool>.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome.

"hack_tick" <> schreef in bericht
news:...
> hi there
> I was looking for some way to use bit field with Arrays
> something similar to
>
> struct Tmp
> {
> int iVar[20] : 1; // each element of Aray having size as 1-BIT
> }
>
> it is possible ??
> any suggestions ???
>
> -regards

The standard template library uses template specialisation for vector<bool>,
I think. You can use this explicitly as the std::bitset class.

hi there
I was looking for some way to use bit field with Arrays
something similar to

struct Tmp
{
int iVar[20] : 1; // each element of Aray having size as 1-BIT
}

it is possible ??
any suggestions ???

-regards

"hack_tick" <> wrote in message
news:...
> hi there
> I was looking for some way to use bit field with Arrays
> something similar to
>
> struct Tmp
> {
> int iVar[20] : 1; // each element of Aray having size as 1-BIT
> }
>
> it is possible ??

No.

> any suggestions ???
>

Use std::bitset instead

#include <bitset>

struct Tmp
{
std::bitset<20> iVar;
};

john

On Wed, 21 Jul 2004 19:08:23 +0530, "hack_tick" <>
wrote:

>hi there
>I was looking for some way to use bit field with Arrays
>something similar to
>
>struct Tmp
>{
> int iVar[20] : 1; // each element of Aray having size as 1-BIT
>}
>
>it is possible ??

Not like that, no.

>any suggestions ???

struct Tmp
{
std::bitset<20> iVar;
};

If you need Tmp to be a POD type, you could code your own POD version
of bitset. OTOH, bitset is close enough to a POD type to work with
memcpy with normal compilers.

Tom

"hack_tick" <> schreef in bericht
news:...
> hi there
> "Christopher Benson-Manica" <> wrote in message
> news:cdlr74$2n5$...
> > hack_tick <> spoke thus:
> [...]
> > Yes - vector<bool>.
>
> thanks for the suggestion, but sorry i didnt mentioned in my earlier post
> that
> I m working on Symbian Series 60 platform, and the struct is a part of
> protocol which i m using over Bluetooth for communication which is already
> tooooo heavy so i was looking for some way to reduce the size by using
> bitfield, also Symbian Series 60 have few bugs and issued with STL so i
> usually tend to avoid STL with my applications.
>
> regards

Then you'll have to write it yourself - it's not hard.

hi there
"Christopher Benson-Manica" <> wrote in message
news:cdlr74$2n5$...
> hack_tick <> spoke thus:
[...]
> Yes - vector<bool>.

thanks for the suggestion, but sorry i didnt mentioned in my earlier post
that
I m working on Symbian Series 60 platform, and the struct is a part of
protocol which i m using over Bluetooth for communication which is already
tooooo heavy so i was looking for some way to reduce the size by using
bitfield, also Symbian Series 60 have few bugs and issued with STL so i
usually tend to avoid STL with my applications.

regards

"tom_usenet" <> schreef in bericht
news:...
> On Wed, 21 Jul 2004 19:08:23 +0530, "hack_tick" <>
> wrote:
>
> >hi there
> >I was looking for some way to use bit field with Arrays
> >something similar to
> >
> >struct Tmp
> >{
> > int iVar[20] : 1; // each element of Aray having size as 1-BIT
> >}
> >
> >it is possible ??
>
> Not like that, no.
>
> >any suggestions ???
>
> struct Tmp
> {
> std::bitset<20> iVar;
> };
>
> If you need Tmp to be a POD type, you could code your own POD version
> of bitset. OTOH, bitset is close enough to a POD type to work with
> memcpy with normal compilers.
>
> Tom

What is POD?
Like RAII?

"Wouter Lievens" <> wrote in message
news:40fe747e$0$3971$...

> What is POD?
> Like RAII?

Plain Old Data.

Try:
http://www.parashift.com/c++-faq-lit....html#faq-26.7

Regards,
Sumit.
--
Sumit Rajan <>

On Wed, 21 Jul 2004 15:49:55 +0200, "Wouter Lievens"
<> wrote:

>"tom_usenet" <> schreef in bericht
>news:.. .
>> On Wed, 21 Jul 2004 19:08:23 +0530, "hack_tick" <>
>> wrote:
>>
>> >hi there
>> >I was looking for some way to use bit field with Arrays
>> >something similar to
>> >
>> >struct Tmp
>> >{
>> > int iVar[20] : 1; // each element of Aray having size as 1-BIT
>> >}
>> >
>> >it is possible ??
>>
>> Not like that, no.
>>
>> >any suggestions ???
>>
>> struct Tmp
>> {
>> std::bitset<20> iVar;
>> };
>>
>> If you need Tmp to be a POD type, you could code your own POD version
>> of bitset. OTOH, bitset is close enough to a POD type to work with
>> memcpy with normal compilers.
>>
>> Tom
>
>What is POD?
>Like RAII?

In addition to what Sumit posted, the key thing about PODs is that you
can memcpy them around, which makes them easy to serialize, etc.

Tom