bounds checking in bitset.

[BHARAT JOSHI]

On Fri, 3 Feb 2006, Paolo Carlini wrote:

> BHARAT JOSHI wrote:
>
>> The bounds checking/exceptions in bitset does not seem to work. I used
>> gcc 3.4.2 on a FC3 system and also gcc 4.0.0 on a FC4.
>> this snippet compiles (and runs) with no warnings with -W and -Wall
>> options enabled.
>>
>> bitset<9> n;
>> n[15]=1;    //works
>> for (i=0 to 20) printf ("%d\n", int(n[i]));  //all 0's excepet in 15th
>> postition
>
> Maybe your doubt stems from expections pre-DR 11. In the current
> standard, C++03, operator[] does *not* throw and requires a valid
> position (user responsability). See 23.3.5.2/46-47, 49-50.

though this is true of standard containers, its not the case for bitset. 
by standard
   "The subscript operator throws out_of_range if subscript is out of
    range. There is *no* unchecked subscript operation."

-- 
Bharat Joshi
Home: http://students.iiit.ac.in/~bharatj