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talk:CppCopy

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1th March 2007, Bilderbikkel

I hoped to show the copying of the std::map to std::cout, but failed. Anybody got an idea?

include <map>

include <vector>

include <algorithm>

include <cassert>

include <iostream>


include <iterator>

include <fstream>


int main()
{
  const int size = 10;
  //Generate a std::map
  std::map<int,int> myMap;
  for (int i=0; i!=size; ++i) myMap[i] = i*i;
  //Generate a std::vector
  std::vector<std::pair<int,int> > myVector;
  myVector.resize(size);
  //Copy the std::map to the std::vector
  std::copy(myMap.begin(),myMap.end(),myVector.begin());
  assert(myVector.size()==10);
  //Display the std::vector
  for (int i=0; i!=10; ++i)
  {
    std::cout
      << myVector[i].first
      << " "
      << myVector[i].second
      << std::endl;
  }
  //Copy to file
  //Code below does not work!
  std::ofstream myFile("MyFile.txt");
  std::ostream_iterator< std::pair<int, int> > fileIterator(myFile);
  std::copy(myMap.begin(), myMap.end(), fileIterator);
}

01-02-2007 Bilderbikkel

Quick note: I have to add

std::ostream& operator<< (std::ostream& os, const std::pair<int,int>& myPair) 
{
  os << myPair.first << '\t' << myPair.second << '\t';
  return os;
}

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