Re: [Boost-users] boost::multi_index

Subject: Re: [Boost-users] boost::multi_index
From: ppatel_at_[hidden]
Date: 2011-04-06 21:28:56

Thanks for your answer Igor. Unfortunately that is out of my control.  
This is the type of structure we used across multiple  applications. I  
was checking key extractors and I think that might work but haven't  
tried out yet.

Thanks
Priyank



On Apr 6, 2011, at 3:32 PM, "Igor R" <boost.lists_at_[hidden]> wrote:

> 2011/4/6  <ppatel_at_[hidden]>:
>> 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<TestStruct, char*, &TestStruct::firstKeyPart>,
>>
>>         member<TestStruct, char*, &TestStruct::secondKeyPart>,
>>
>>         member<TestStruct, uint32_t, &TestStruct::thirdKeyPart>,
>>
>>       >
>>
>>     >
>>
>>   >
>>
>>> 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.
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