C++ bug with std::copy and std::pair

[Paul Edwards]

Version information:

[EMAIL PROTECTED] ~ $ g++ -v
Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/specs
Configured with: /var/tmp/portage/gcc-3.3.6/work/gcc-3.3.6/configure
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/3.3.6
--includedir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3.6
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3.6/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3.6/info
--with-gxx-include-dir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.6/include/g++-v3 
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec 
--enable-nls --without-included-gettext --with-system-zlib --disable-checking 
--disable-werror --disable-libunwind-exceptions --disable-multilib 
--disable-libgcj --enable-languages=c,c++,f77 --enable-shared 
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
Thread model: posix
gcc version 3.3.6 (Gentoo 3.3.6, ssp-3.3.6-1.0, pie-8.7.8)

I also found the same problem with a friends fedora core 4 with gcc 4.

I have attached a cpp file that (I believe) should compile (and does on
Borland c++).  It is the copy at the end that causes a problem - the
while loop is simply doing the same as what the copy should do (just to
show I did the operator<< properly).  Copy works for other cases (ints,
floats, etc) and even for my own structs too.  I'm just not sure why it
complains about the operator<< function for a std::pair.

Paul

#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
#include <iterator>

using namespace std;

typedef pair<bool, float> MyPair;
typedef vector<MyPair> MyPairColl;

ostream& operator<<(ostream& os, const MyPair& myPair)
{
        os << myPair.first << ' ' << myPair.second;
        return os;
}

int main()
{
	const int maxElems = 100;
        
	MyPairColl coll(maxElems);
        
	for(int i=0; i<maxElems; ++i)
        {
                coll[i] = make_pair(i%2, 0.3 * i);
        }
        
	const MyPairColl::const_iterator itEnd(coll.end());
	MyPairColl::const_iterator it(coll.begin());
	while(it != itEnd)
	{
		cout << *it << ' ';
		++it;
	}
	copy(coll.begin(), coll.end(), ostream_iterator<MyPair>(cout, " "));
}