Re: [Boost-users] boost::multi_index

2011/4/6 :

Hello,

I have a question regarding creating composite key/specifying length for arrays while using multi_index container based on following structure.

struct TestStruct {

                char firstKey[50];

                char secondKeyPart[3];

                uint32_t thirdKeyPart;

                ……Some other information….

};

Do I really read to specify this lengths for character arrays? If yes, how do I do that while specifying key parts as below?

typedef multi_index_container <

TestStruct,

  indexed_by<

    //non-unique as some subscribers might have more than one number

    hashed_unique<

      composite_key<

        TestStruct,

        member,

        member,

        member,

      >

    >

  >

...

TS;

The above keys will hash the pointer values, which is probably not what you want. If you change plain C arrays to std::string, it will work as you expect.