A dynamic bitset?

[tobias.sturn]

How would be the best solution to create a dynamic bitset cause with
the stl bitset you have to give a number of how big the bitset will be
and i dont know the size at the beginning...

Thanks very much!!

 

[Kyle]

How would be the best solution to create a dynamic bitset cause with
the stl bitset you have to give a number of how big the bitset will be
and i dont know the size at the beginning...

Thanks very much!!

boost::dynamic_bitset

 

[John Harrison]

How would be the best solution to create a dynamic bitset cause with
the stl bitset you have to give a number of how big the bitset will be
and i dont know the size at the beginning...

Thanks very much!!

vector<bool> is a possibility. Depends exactly what you want to do.

john

 

[tobias.sturn]

vector<bool> would be too big for me... But vector<bitset<32> > is a
possibility

 

[Andrey Tarasevich]

vector<bool> would be too big for me... But vector<bitset<32> > is a
possibility

'std::vector<bool>' is supposed to be specialized as a bit-vector, not as a
plain vector of 'bool' objects, meaning that it will be essentially the same as
your 'vector<bitset<32> >', but with more natural interface. Check your
standard library implementation.

 

[tobias.sturn]

'std::vector<bool>' is supposed to be specialized as a bit-vector, not as a
plain vector of 'bool' objects, meaning that it will be essentially the same as
your 'vector<bitset<32> >', but with more natural interface. Check your
standard library implementation.

Really?!? But when i had to write convertations from numbers to bits
and from bits to numbers.... Correct?

 

[Andrey Tarasevich]

Really?!?
Yes.

But when i had to write convertations from numbers to bits
and from bits to numbers.... Correct?

Er... Sorry, but I don't understand the question. Can you please clarify?

 

[tobias.sturn]

With bitsets you can make things like:

bitset<32> bits(12);
bits = 4;
int var = bits.to_ulong();

So i can create the bits out of a number. With this bitvectors i had to
write such functions...

 

[Andrey Tarasevich]

With bitsets you can make things like:

bitset<32> bits(12);
bits = 4;
int var = bits.to_ulong();

So i can create the bits out of a number. With this bitvectors i had to
write such functions...

Yes, with 'std::vector<bool>' you'll have to write it yourself or use a
third-party implementation.