it compiled error! I redefined "channel_table_pr_view" like this, typedef multi_index_container< channel*, ordered_non_unique< key_from_key< BOOST_MULTI_INDEX_MEMBER(peer, int guid_), BOOST_MULTI_INDEX_MEMBER(channel, peer* pr_) >

channel_table_pr_view; and insert some element like this,

peer_table pt_; const peer* pr1_ = *&(pt_.insert(peer(1)).first); const peer* pr2_ = *&(pt_.insert(peer(2)).first); ... other 1000000 channel_table ct_; ct.insert(channel(1, pr1_, 0)); ct.insert(channel(2, pr2_, 2)); ct.insert(channel(3, pr3_, 4)); ... other 100000 nth_index::type ic0,ic1; boost::tie(ic0, ic1) = get<0>(ct).equal_range(md5_); channel_table_pr_view ctpv; while (ic0 != ic1) { ctpv.insert(&*ic0); /// compiled error! ++ic0; } but it compiled error: Error 1 error C2664: 'std::pair<_Ty1,_Ty2> boost::multi_index::detail::ordered_index::insert(channel *const )' : cannot convert parameter 1 from 'const channel*' to 'channel *const '. Joaquin M Lopez Munoz wrote:

isjk escribió:

...

hi,

now, I have two structures like this,

[...]

typedef multi_index_container< const channel*, ordered_non_unique< key_from_key< BOOST_MULTI_INDEX_MEMBER(peer, const int, guid_), BOOST_MULTI_INDEX_MEMBER(channel, const peer*, pr_) > >

...

channel_table_pr_view;

[...]

channel_table_pr_view::iterator ictpv = ctpv.find(guid_); if (ictpv != ctpv.end()) { ctpv.modify(ictpv, _Modify_prop()); // right or not? }

struct _Modify_prop{ void operator()(channel& cl_) { cl_.prop = rand(); } };

This is not correct: _Modify_prop is passed a reference to the element of channel_table_pr_view, which is a const channel*, so the right signature for _Modify_prop::operator() is

struct _Modify_prop{ void operator()(const channel*& pcl_); };

Due to the const qualifier you won't be able to do the modification, so consider redefining channel_table_pr_view as holding pointers to non-const objects:

typedef multi_index_container< channel*, ordered_non_unique< ...

...

channel_table_pr_view;

and making the necessary adjustments.

Joaquín M López Muñoz Telefónica, Investigación y Desarrollo _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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