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  #1 (permalink)  
Old 08-06-2008, 11:36 PM
utefan001
 
Posts: n/a
question mark operator

Hi,
I having a hard time finding an online explanation of syntax involving
">?="
For example

int ret = somevalue;
int cur = somevalue;

ret >?= cur;

Can someone please explain this concept? If you have a online source,
that would be even better.

thanks

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  #2 (permalink)  
Old 08-07-2008, 12:03 PM
Jiang
 
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Re: question mark operator

On Aug 7, 7:36 am, utefan001 <utefan...@gmail.com> wrote:
> Hi,
> I having a hard time finding an online explanation of syntax involving
> ">?="


[...]

>
> Can someone please explain this concept? If you have a online source,
> that would be even better.



`<?' , `>?', '<?=' and `>?=' are all old non-standard G++
extensions.
These deprecated operators were removed from GCC 4.2.
Use std::min and std::max instead, please.

http://gcc.gnu.org/onlinedocs/gcc-3.0.4/gcc_6.html
http://gcc.gnu.org/gcc-4.2/changes.html

HTH

Jiang


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  #3 (permalink)  
Old 08-07-2008, 12:07 PM
=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?=
 
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Re: question mark operator

On 2008-08-07 00:36, utefan001 wrote:
> Hi,
> I having a hard time finding an online explanation of syntax involving
> ">?="
> For example


You will have to search a long time before you find it because it is not
in the C++ language. Perhaps you meant the conditional operator "?:" or
the trigraph "??="?

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Erik Wikström


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  #4 (permalink)  
Old 08-07-2008, 12:28 PM
Ulrich Eckhardt
 
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Re: question mark operator

utefan001 wrote:
> I having a hard time finding an online explanation of syntax involving
> ">?="
> For example
>
> int ret = somevalue;
> int cur = somevalue;
>
> ret >?= cur;
>
> Can someone please explain this concept? If you have a online source,
> that would be even better.


IIRC, that is a GCC extension, so you would be best off looking in the GCC
documentation. From memory, I think it simply performs an assignment
conditionally based on which of the two operands is greater, i.e. the code
is equivalent to

ret = std::max( ret, cur);

or maybe

if(cur>ret)
ret = cur;

Uli


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