// In header: <boost/interprocess/indexes/flat_map_index.hpp>

template<typename MapConfig> 
struct flat_map_index_aux {
  // types
  typedef MapConfig::key_type                                         key_type;            
  typedef MapConfig::mapped_type                                      mapped_type;         
  typedef MapConfig::segment_manager_base                             segment_manager_base;
  typedef std::less< key_type >                                       key_less;            
  typedef std::pair< key_type, mapped_type >                          value_type;          
  typedef allocator< value_type,segment_manager_base >                allocator_type;      
  typedef flat_map< key_type, mapped_type, key_less, allocator_type > index_t;             
};