How to copy maps to ostream_iterators?

From:

"Siegfried Heintze" <siegfried@heintze.com>

Newsgroups:

comp.lang.c++.moderated

Date:

2 May 2006 06:47:15 -0400

Message-ID:

<4456d1ff@mamba.>

I have the following code that I am trying to compile with g++ 3.2 (see
below).

The syntax error messages are telling me there is no function operator<<
defined to accept a std::pair. This is not true: as you can see I have
defined such a function. I've seen this work with other compilers. I've
tried

std::ostream& operator<<(std::ostream&os, const
std::pair<std::string,std::string>&x){ .... }

but that does not work either.

Can anyone tell me what I am doing wrong?
Thanks,
Siegfried

template <typename K, typename V>
inline std::ostream& operator<<(std::ostream& os, const std::pair<K,V>& x)
{
    return os << "[" << x.first << ","<< x.second << "]";
}

std::map<std::string,std::string> m;
std::string hello="hello", world="world";
m[hello]=world;

std::copy(m.begin(),m.end(),
std::ostream_iterator<std::pair<std::string,std::string> >(std::cout));

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