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boost::intrusive::get_hashtable_size_wrapper_bucket
// In header: <boost/intrusive/hashtable.hpp> template<typename ValueTraits, typename VoidOrKeyOfValue, typename VoidOrKeyHash, typename VoidOrKeyEqual, typename BucketTraits, typename SizeType, std::size_t BoolFlags> struct get_hashtable_size_wrapper_bucket { // types typedef hashtable_size_wrapper< bucket_hash_equal_t< ValueTraits, VoidOrKeyOfValue, VoidOrKeyHash, VoidOrKeyEqual, BucketTraits, 0 !=(BoolFlags &hash_bool_flags::linear_buckets_pos), 0 !=(BoolFlags &hash_bool_flags::cache_begin_pos) >, SizeType,(BoolFlags &hash_bool_flags::incremental_pos) !=0||(BoolFlags &hash_bool_flags::fastmod_buckets_pos) !=0 > type; };