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

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 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< 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

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_______________________________________________ Jeremy Siek http://www.osl.iu.edu/~jsiek Ph.D. Student, Indiana University Bloomington C++ Booster (http://www.boost.org) _______________________________________________

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