Re: Doesn't std::map.erase returns iterator?

I have a project that compiles in Microsoft Visual C++ .net 2003. I'm
trying to compile it in Dev C++ to try to get some optimization.
However, I get an error on this code which seems to tell me it can't
assign the iterator.:

typedef std::map<unsigned int, CEffect*> BeamEffectsType;

// ...

     // Update ALL the -On-The-Fly- or Fired 'Beams' to NEW positions.
    for ( BeamEffectsType::iterator it = Client.BeamEffects.begin(); it
    !=
Client.BeamEffects.end(); )
    {
        if ( !(*it).second->Update() )
        {
            delete (*it).second;
            it = Client.BeamEffects.erase(it);
        }
        else
            ++it;
    }

Where BeamEffects in Client is a BeamEffectsType.

Abyssal.cpp:2313: error: no match for 'operator=' in 'it =
(((BeamEffectsType*)(&Client)) + 208324u)->std::map<_Key, _Tp, _Compare,
_Alloc>::erase [with _Key = unsigned int, _Tp = CEffect*, _Compare =
std::less<unsigned int>, _Alloc = std::allocator<std::pair<const
unsigned int, CEffect*> >](it)'
e:/Dev-Cpp/include/c++/3.4.2/bits/stl_tree.h:152: note: candidates are:
std::_Rb_tree_iterator<std::pair<const unsigned int, CEffect*> >&
std::_Rb_tree_iterator<std::pair<const unsigned int, CEffect*>
 >::operator=(const std::_Rb_tree_iterator<std::pair<const unsigned int,
CEffect*> >&)

The line 2313 being
            it = Client.BeamEffects.erase(it);

It shows the same error in another part of the code where I'm doing the
same thing with the BeamEffects. Is MSVC++ returning an iterator for a
std::map as an extension,

should, or am I doing something else wrong that I can't tell?

Thanks.