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Subject: [Boost-users] [MultiIndex] cryptic gcc error
From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2011-09-02 09:07:18

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
    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::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,

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