Hi folks,

Consider the following code (which distilled from a real world example):

#include <boost/move/move.hpp>

#include <boost/optional/optional.hpp>

#include <utility>

#include <vector>

typedef boost::optional<int> data_type;

typedef std::vector<data_type> vector_type;

vector_type func()

{

    vector_type vv;

    return move(vv);

}

If I compile this code using Boost 1.49 on Visual Studio 2010, or on a recent version of g++ (e.g. 4.7.1) which supports some C++11 features, the code fails to compile, complaining about ambiguity between std::move and boost::move.  Strangely, the code compiles fine with Apple Clang version 3.1.

Is there a way to work around the compilation problem which doesn't involve explicitly qualifying the calls to move?  I'd prefer to use argument-dependent-lookup.

 Removing the includes of boost/move.hpp is not possible.  In the real world example, that header is included indirectly.

I did notice that if I define the macro BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE, the compilation errors disappear.  Is this the correct approach for compilers which support std::move?  I find it odd that this macro isn't already defined for such compilers.