A C++ library which enables the construction of containers maintaining one or more indices with different sorting and access semantics.
Questions tagged [boost-multi-index]
248 questions
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1 answer
where can I find example of boost::multi_index range deletion
I'm looking for example code for the deletion of elements in a multi_index container, using an ordered_non_unique range. I've found a single example on the boost site, which I can't duplicate with my code. I'm hoping for examples not written by the…
ecarew
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0
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How do I practice with multi_index of boost library
Do you have any document or project which I can practice with boost:multi_index?
Jena
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Iterator becomes invalid after inserting in a boost::multi_index?
According to the documentation, hashed index iterators remains valid when new elements are inserted into a multi_index. However when I attempted the following approach
auto& myIndex = myMultiIndex.get<0>();
auto range = myIndex.equal_range(x);
for…
Niko
- 257
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boost::multi_index_container compile error due to incomplete type on index typedef'ing
I am using the boost::multi_index_container (as follows) and I am running into a compile error when trying to typedef the index:
struct del_t
{
string del_id;
string dev_version;
};
struct count_container_t
{
uint32_t count_1;
uint32_t…
decimus phostle
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C++ Multi index table - eos persistance API
The code snippet for this question is from the Persistance API section of the WIKI documentation for EOS. The link to this page is here...
https://github.com/EOSIO/eos/wiki/Persistence-API
In the following code snippet, it looks like the class…
kamiss
- 45
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0
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1 answer
boost multi index - loop through key value of specific entry
I have a multi index with 2 indexes(in real code, they are of different type).
class CrUsersKeys{
int IMSI;
int TIMESTAMP;
}
After i find an entry in the multi index, I have the iterator of the entry.
auto it =…
yaron
- 439
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- 16
0
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1 answer
Multi index copy in shared memory
I have a multi index in shared memory.
I need to dump the content of multi index to csv.
So each action on the multi index is protected by a mutex lock.
So the way i did the dump, is lock the mutex, loop through a specific list index and write…
yaron
- 439
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- 16
0
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1 answer
Iterate over a vector to update a word_counter
I have a vector of Result structures, each of which contains a contract string that is a "word"
struct Result
{
string contract;
int score;
};
I want to find the frequency of occurrence of the distinct words in the…
DLyons
- 188
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Min & Max Value from Projected boost MultiIndex iterator
I am facing a sorting issue based on a Projected value from an iterator in the MultiIndex container. Below is the complete code. What I have removed here is the call of SellOrderRecord because the function called is same GenerateData but the…
Shailendra kumar
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Best container for struct with several keys c++
Given the following struct:
struct{
// Keys
int key1;
double key2;
type key3;
...
// Variables to increment
double varibleToIncrement;
...
}
What would be the best container to store these records given that I will need to increment the variables…
Batmax
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0 answers
Boost multiindex container does not compile with generic type
I was trying to utilize a boost-multiindex container for fast and positional access. Providing something like a std::vector and an std::map at the same time. I had no problem to construct a simple boost-multiindex class. It worked really neat.
The…
Aleph0
- 5,816
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0
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1 answer
Append index to a multi-index container
i am a newbie to boost multi_index,
and currently trying to create a multi index container for which i will be able to define indices after the container is declared.
In particular i want to load a number of different mysql dbs and thus need a…
K. Xenoulis
- 11
- 2
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1 answer
Return an iterator to boost multiintex container as a std::set<>::iterator
The documentation for Boost multiindex containers seem to indicate that I can use it as a set after declaring an index to iterate over. So I was wondering if it is possible to hide the boost implementation and return an iterator masqueraded as an…
xcorat
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Cannot find after insertion in boost multi_index
I created a boost multi_index in which I am inserting objects.
My multi_index looks as follows,
typedef boost::multi_index_container<
Container*,
boost::multi_index::indexed_by<
boost::multi_index::hashed_unique<
…
codeworks
- 149
- 1
- 15
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1 answer
Index with boost multi_index
How can I index a boost::multi_index container using a member function of class(that is being stored in the multi_index) that returns a constant reference of another class?
The error I get is :
error C2440: 'specialization' : cannot convert from…
codeworks
- 149
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