Re: [Boost-users] How to copy binary file to dynamic bitset?

From: Fujinobu Takahashi (fjtaka_at_[hidden])
Date: 2005-07-05 09:45:03

Hello Jeremy,

Thank you very much for your very prompt reply for my question.
I tried simple code and works well as follows:
-------------------------------
#include<iostream>
#include<fstream>
#include <boost/dynamic_bitset.hpp>

using namespace std;
using namespace boost;

int main(){
        
        int n=640000; // 80KB = 640kbits data length example
        int m=40;      // 40(±20)bits shift counters
        
        dynamic_bitset<>  bit26(n), bit34(n), bit34m(n);

        ifstream fbit26, fbit34;//Two input streams
        
        fbit26.open("26m_80KB.dat", ios::in | ios::binary);
        fbit34.open("34m_80KB.dat", ios::in | ios::binary);

        fbit26 >> bit26;//copy fbit26 stream dynamic_bitset bit26
        fbit34 >> bit34;//copy fbit34 stream dynamic_bitset bit34
        
        bit34m=bit34;
        
//	cout << "bit26 ";
        cout << bit26 << endl<<endl;
        
//	cout << "bit34 ";
        cout << bit34 << endl<<endl;

        long cnt[m];//integration counters for 40 bits
        
        int m2=m/2;
                cnt[m2]= (bit26 ^ bit34).count()-n/2;// Counter of shift=20(center)

                cout<<"j="<<m2<<" Counts of bit:1= "<<cnt[m2]<<endl;

        for (int j=1; j<m2; j++){
                cnt[m2-j]= (bit26^(bit34 <<=1)).count()-n/2;//left shift conters
                cnt[m2+j]= (bit26^(bit34m >>=1)).count()-n/2;//right shift conters

                cout<<"j="<<j<<" Counts of bit:1= "<<cnt[m2-j]<<"  "<<cnt[m2+j]<<endl;

        }
        fbit26.close();
        fbit34.close();
        
        return 0;
}
--------------------------------------
Using this code my integration works very well and fast but 
cout << bit26 or
cout << bit32
do not work, they are empty!

If possible, would you please show me any concrete hint or a very
introductory sample of the copy of binary file?
Using them I can challenge again to explore a mystery of dynamic bitset.

Very thanks,

Fuji

On Thu, 30 Jun 2005 13:46:00 -0500
Jeremy Siek <jsiek_at_[hidden]> wrote:

> Hi Fuji,
> 
> The dynamic_bitset construtor that takes a input iterator over blocks 
> was meant
> for this kind of construction. It would be up to you to obtain/create 
> the iterator.
> 
> template <typename BlockInputIterator>
> explicit
> dynamic_bitset(BlockInputIterator first, BlockInputIterator last,
>                 const Allocator& alloc = Allocator());
> Effects: Constructs a bitset based on a range of blocks. Let *first be 
> block number 0, *++first block number 1, etc. Block number b is used to 
> initialize the bits of the dynamic_bitset in the position range 
> [b*bits_per_block, (b+1)*bits_per_block). For each block number b with 
> value bval, the bit (bval >> i) & 1 corresponds to the bit at position 
> (b * bits_per_block + i) in the bitset (where i goes through the range 
> [0, bits_per_block)).
> Requires: The type BlockInputIterator must be a model of Input Iterator 
> and its value_type must be the same type as Block.
> Throws: An allocation error if memory is exhausted (std::bad_alloc if 
> Allocator=std::allocator).
> 
> 
> 
> On Jun 30, 2005, at 10:16 AM, Fujinobu Takahashi wrote:
> 
> > Hello,
> >
> > I would like to try one-bit correlation between two one-bit sampling
> > VLBI data files using powerful dynamic bitset library.
> > (VLBI:Very Long Baseline Interferometer)
> >
> > A binary file japan.dat includes one-bit sampling data of a quasar
> > received at a Japanese antenna and another binary file usa.dat
> > includes one-bit sampling data of a same quasar received
> > simultaneously at a US antenna. The bitset block size should be more
> > than 10Mbits
> >
> > What kind of constructor codes should I write to copy the
> > bit-pattern of each data file to each very long dynamic bitset?  I
> > am sorry but I could not find any good answer from Google search.
> >
> > I am looking forward to helpful answer in this mail-list.
> >
> > Very Thanks
> >
> > fuji
> >
> >
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
> _______________________________________________
> Jeremy Siek <jsiek_at_[hidden]>
> http://www.osl.iu.edu/~jsiek
> Ph.D. Student, Indiana University Bloomington
> C++ Booster (http://www.boost.org)
> _______________________________________________
> 
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