Passing a custom comparator object

[kartiklakhotia]

Hi,

I am trying to do a decreasing sort on an array (say keys), using the values in another array (say val). For this, I have written a custom comparator class and am passing an object to the boost function. While the same technique compiles with the std::sort, it gives an error with the boost::sort::parallel_stable_sort and boost::sort::block_indirect_sort.

Comparator class:

Function calls to boost/std sorts:

Error:

[fjtapia]

The solution is simplel. Define the function as const, change the parameters as const reference. With this I compile and run correctly. the code. bool operator () (const T1 &i1, const T1 &i2) const { return (value_vector[i1]> value_vector[i2]); }; If you find any other problem, please say me. Thanks by your interest Francisco Tapia El mié., 25 dic. 2019 a las 2:47, Kartik Lakhotia (<notifications@github.com>) escribió:

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Hi, I am trying to do a decreasing sort on an array (say keys), using the values in another array (say val). For this, I have written a custom comparator class and am passing an object to the boost function. While the same technique compiles with the std::sort, it gives an error with the boost::sort::parallel_stable_sort and boost::sort::block_indirect_sort. Comparator class: [image: image] <https://user-images.githubusercontent.com/2591784/71428386-51957580-2675-11ea-8ff0-933f9cdfb906.png> Function calls to boost/std sorts: [image: image] <https://user-images.githubusercontent.com/2591784/71428398-65d97280-2675-11ea-9123-98e5ae112e30.png> Error: [image: image] <https://user-images.githubusercontent.com/2591784/71428407-74c02500-2675-11ea-91f4-89dad38e14a2.png> — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#6?email_source=notifications&email_token=AA5O5GDNEP7GH5POJNQDHSTQ2K3TLA5CNFSM4J7BVLV2YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4ICRZYYA>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA5O5GCO6R44OBWMF6ZUQODQ2K3TLANCNFSM4J7BVLVQ> .

[kartiklakhotia]

This works, thanks!