multi_index index member of sub class member

StackOverflow https://stackoverflow.com/questions/22985781

  •  01-07-2023
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Question

I am having problem to define a subclass member as index member
Is this possible
For the following code

namespace bmi = boost::multi_index;
namespace bip = boost::interprocess;

struct UsersKey {
    uint64_t IMSI;
};

struct UsersVal {
    uint64_t IMSI;
};

struct HashEntry{
    UsersKey key;
    UsersVal val;
}

typedef bmi::hashed_unique<bmi::tag<struct IMSI_tag>,  bmi::member<HashEntry, uint64_t , &HashEntry::UsersKey::IMSI>,  boost::hash<uint64_t>, std::equal_to<uint64_t> > hashed_by_IMSI;


typedef 
  bmi::indexed_by<  hashed_by_IMSI > UsersKey_hash_indices;

 typedef boost::multi_index::multi_index_container<
      HashEntry,
      UsersKey_hash_indices>
    > GlobalHash;

I get the following error

error: no member named 'UsersKey' in 'HashEntry'; did you mean simply 'UsersKey'?

Here is a link to online code http://coliru.stacked-crooked.com/a/d736557edf615fc2

Was it helpful?

Solution

The C++ pointer to member function syntax does not allow to designate members inside members as you intend to do here. One simple option is to use the provided global_fun key extractor as shown at http://coliru.stacked-crooked.com/a/c57625bfb1d5acfa

Best,

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