From: JOAQUIN LOPEZ MU?Z (joaquin_at_[hidden])
Date: 2007-09-24 17:32:42
Hi Jeffrey
----- Mensaje original -----
De: Jeffrey Holle <jeffreyholle_at_[hidden]>
Fecha: Lunes, Septiembre 24, 2007 11:08 pm
Asunto: [Boost-users] [multi_index] modify problem with composite_key
Para: Boost Users mailing list <boost-users_at_[hidden]>
> I am having problems using the modify method with my composite_key.
> Here is my multi_index container definition:
> typedef multi_index_container<
> entry,
> indexed_by<
> ordered_unique<member<entry,DataVertex,&entry::m_vertex> >,
> ordered_non_unique<
> composite_key<
> entry,
> member<entry,int,&entry::m_y>,
> member<entry,int,&entry::m_x>
> >
> >
> >
> > C;
>
> C m_c;
> namespace ll=boost::lambda;
>
> typedef nth_index<C,1>::type XYINDEX;
>
> I have a XYINDEX::iterator that is defined using the equal_range
> method of an XYINDEX order. Now I wish to modify the m_x
> attribute that this iterator points to so I attempt to write:
>
> inline void
> Positioner::updateX(XYIterator iter,int x)
> {
> m_c.modify(iter,(&ll::_1)->*&Positioner::entry::m_x=x);
> }
>
> I get this compiler error:
[...]
m_c.modify(...) implicitly uses the interface of C's index #0,
yet you're passing it a XYIterator, which belongs to index #1.
Iterators have to be matched with the index they're associated
with:
inline void
Positioner::updateX(XYIterator iter,int x)
{
// note the get<1>() bit
m_c.get<1>().modify(
iter,(&ll::_1)->*&Positioner::entry::m_x=x);
}
Does it work now?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
PS: I posted an answer to some previous question of yours that
you haven't confirmed yet:
http://listarchives.boost.org/boost-users/2007/09/30804.php
Is it all solved?