Re: ostream_iterator with map pairs

red floyd <>
Sat, 26 Jul 2014 11:29:50 CST
On 7/25/2014 8:18 AM, Richard wrote:

[Please do not mail me a copy of your followup]

I must be doing something wrong, but I expected this to compile and work:

#include <algorithm>
#include <iostream>
#include <iterator>
#include <map>

std::ostream& operator<<(
    std::ostream& out,
    const std::pair<size_t, size_t>& rhs)
     return out << rhs.first << ", " << rhs.second;

int main()
     std::map<size_t, size_t> m;

     for (size_t i = 0; i < 10; ++i)
         m[i] = 2U*i;

     std::copy(m.begin(), m.end(),
         std::ostream_iterator<const std::pair<size_t, size_t>>(std::cout,

     return 0;

...but I get a compile error where ostream_iterator is instantiated
both on g++ 4.6.3 and VS 2013.

What am I missing?

The first element in the pair for a map element is const.
You need:

std::ostream& operator<<(
  std::ostream& out,
  const std::pair<const size_t, size_t>& rhs);

      [ See for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]

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