C / C++ / MFC

void CPropWnd::OnShowNavigatorWnd()
{
	CNavWnd *pNav = new CNavWnd(this);

	CRect rc;
	rc.SetEmptyRect();
	if (!pNav->Create(NULL, NULL, WS_VISIBLE | WS_OVERLAPPEDWINDOW, rc, this, UINT(-1)))
	{
		ASSERT(FALSE); //it's ok, never got here
	}
	GetWindowRect(&rc);
	pNav->SetWindowPos(NULL, rc.right + 5, rc.top, -1, -1,
		SWP_NOSIZE | SWP_NOZORDER | SWP_SHOWWINDOW); // the size of nav wnd will be assigned in CNavWnd::OnCreate() by itself
	pNav->UpdateWindow();
}

e:\projects\netsim\netsim\grafo.cpp(66) : error C2679: binary '=' : no operator found which takes a right-hand operand of type 'std::_Vector_const_iterator<_Ty,_Alloc>' (or there is no acceptable conversion)
        with
        [
            _Ty=Ligacao *,
            _Alloc=std::allocator<Ligacao *>
        ]
        c:\program files (x86)\microsoft visual studio 8\vc\include\vector(392): could be 'std::_Vector_iterator<_Ty,_Alloc> &std::_Vector_iterator<_Ty,_Alloc>::operator =(const std::_Vector_iterator<_Ty,_Alloc> &)'
        with
        [
            _Ty=Ligacao *,
            _Alloc=std::allocator<Ligacao *>
        ]
        while trying to match the argument list '(std::_Vector_iterator<_Ty,_Alloc>, std::_Vector_const_iterator<_Ty,_Alloc> )'
        with
        [
            _Ty=Ligacao *,
            _Alloc=std::allocator<Ligacao *>
        ]

std::vector<Ligacao *>::iterator it;

for (it=this->_m_graf_map[_onde].begin() ; it != this->_m_graf_map[_onde].end() ; it++)
{
    if (
        ((*it)->esquerda()->id() == _esq && (*it)->direita()->id() == _dir) ||
        ((*it)->esquerda()->id() == _dir && (*it)->direita()->id() == _esq)
    ) return true;
}

std::vector<std::vector<Ligacao *> >	_m_graf_map;