[boost] Boost 1_31 - Problem with Lambda, UnNamed namespaces VC7.1

From: Brian Braatz (brianb_at_[hidden])
Date: 2004-10-09 14:59:49

I have searched the list archive and have not found anything on this
subject.

I have what looks like to be an issue with MSVC7.1 and unnamed
namespaces
(the _1 _2 and _3 are in unnamed namespaces in boost::lambda)

See below:

#include <boost/bind.hpp>
#include <boost/Lambda/lambda.hpp>

// adding my code to the boost::lambda namespace
// below works fine
namespace boost
{
        namespace lambda 
        {
                void MyFunction()
                {
                        using namespace std;
                        list<int> v;
                        v.push_back(1);
                        v.push_back(2);
                        v.push_back(3);
                        v.push_back(4);
                        v.push_back(5);
                        
                        // Line below works
                        for_each(v.begin(), v.end(), std::cout << _1 <<
' ');
                }
        }	 
}

// Now global namespace
void MyFunction()
{
        using namespace std;
        using namespace boost;
        using namespace boost::lambda;
        
        list<int> v;
        v.push_back(1);
        v.push_back(2);
        v.push_back(3);
        v.push_back(4);
        v.push_back(5);
        
        // Line below fails with a "error C2872: '_1' : ambiguous
symbol"
        for_each(v.begin(), v.end(), std::cout << _1 << ' ');
        
        // This line DOES work
        for_each(v.begin(), v.end(), std::cout << boost::lambda::_1 << '
');
}

Has anyone else run into this? Also- I do not have the current CVS tree
handy (I am using 1.31), is this a problem on 1.32? If it is
workedaround in some fashion, I can just qualify every _1 and _2 until
1.32 comes out.

Thanks for any help or suggestions

Brian Braatz