Re: [Boost-users] [MultiIndex] cryptic gcc error

Subject: Re: [Boost-users] [MultiIndex] cryptic gcc error
From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2011-09-02 09:44:28

Ok, sorry for the noise... composite_key expects the result_type as the
first parameter and I did not specify it...

Anyway thanks to all answers!

On Fri, Sep 2, 2011 at 3:07 PM, Ovanes Markarian <om_boost_at_[hidden]>wrote:

> Hello *,
>
> I try to use a multi_index container with a composite key. The container is
> defined as follows:
>
>   struct index_data
>   {
>     entry_header header; //has various public fields one of them is
> timestamp_
>     fs::entry entry;
>     bool masked;
>   };
>
>   typedef size_t timestamp_t; //in reallity this type is a class, but the
> error can be reproduced with this typedef as well
>
>   timestamp_t const& timestamp(index_data const& data)
>   {
>     return data.header.timestamp_;
>   }
>
>   bool mask_state(index_data const& data)
>   {
>     return data.masked;
>   }
>
>  struct entry_data_tag {};
>
>   typedef mi::multi_index_container
>   < index_data,
>     mi::indexed_by
>     < mi::ordered_non_unique
>       < mi::tag<entry_data_tag>
>       , mi::composite_key
>         < mi::global_fun<index_data const&, bool, &mask_state> //this could
> be a direct member reference, but I intially used fusion::map and reduced
> the problem to minimum
>         , mi::global_fun<index_data const&, timestamp_t const&, &timestamp>
>         >
>       >
>     >
>   > entry_index;
>
>   typedef entry_index::index<entry_data_tag>::type entry_data;
>
>
>   void mask_all()
>   {
>     using namespace boost::lambda;
>     entry_data& entries = pimpl_->indexed;
>
>     entries.find(boost::make_tuple(false)); //!!!! this line results in an
> error novel by gcc 4.3
>   }
>
>
> The error description is:
> multi_index/composite_key.hpp:638: error: no match for 'operator*' in '*x'
>
> Does anyone have some suggestions why that happens?
>
>
> With Kind Regards,
> Ovanes
>