Re: Looking to write bitsets to a basic_string

From:

"Brian Neal" <bgneal@gmail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

14 Dec 2006 17:43:00 -0500

Message-ID:

<1166107386.340725.248590@79g2000cws.googlegroups.com>

CSAWannabe wrote:

I've got a vector of bitsets with 10 bits in each bitset like this:

std::vector<std::bitset<10> > m_vctBitSets;

std::bitset<10> bsBitSet = 0xF0;
m_vctBitSets.push_back(bsBitSet);

I want to write the vector bitsets to a std::string.. so that there is
no gap between each bitset,i.e. the second bitset in the vector would
start on bit 11 in the std::string.

bitset already has a >> for inserting into streams. So you could insert
them into a stringstream, and then use the member function str() to get
the string out. An example:

#include <iostream>
#include <sstream>
#include <ostream>
#include <algorithm>
#include <vector>
#include <bitset>
#include <iterator>

using namespace std;

typedef bitset<10> MyBitset;

int main()
{
   vector<MyBitset> v;
   v.push_back(0);
   v.push_back(0x3ff);
   v.push_back(0);

   ostringstream os;

   copy(v.begin(), v.end(), ostream_iterator<MyBitset>(os, ""));
   cout << os.str() << endl;

   return 0;
}

Output:

$ ./test2
000000000011111111110000000000

--
      [ See http://www.gotw.ca/resources/clcm.htm for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]