[Boost-users] boost::foreach not compiling

From: Patrick Loney (Patrick.Loney_at_[hidden])
Date: 2008-06-09 05:36:19

Excuse me, I'll post all of it this time :)

Hi,

Using boost 1.34.1, attempting a simple iteration over a std::list using
BOOST_FOREACH and getting various compile errors all linked to mpl as
below

d:\Projects\boost\boost_1_34_1\boost/foreach.hpp(123) : error C3083:
'mpl': the symbol to the left of a '::' must be a type
        d:\Projects\boost\boost_1_34_1\boost/foreach.hpp(125) : see
reference to class template instantiation
'Operations::boost::foreach::is_lightweight_proxy<T>' being compiled

which relates to the following code in the header:

////////////////////////////////////////////////////////////////////////
///////
    // boost::foreach::is_lightweight_proxy
    //   Specialize this for user-defined collection types if they are
inexpensive to copy.
    //   This tells BOOST_FOREACH it can avoid the rvalue/lvalue
detection stuff.
    template<typename T>
    struct is_lightweight_proxy
      : boost::mpl::false_
    {
    };

I have no idea what mpl is and haven't linked in any new libraries to
allow use of foreach. Any ideas what I'm doing wrong?

Thanks,
Patrick

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