Thanks Chris! This is a bug on our end as the specialization is done for hpx::threads::thread_id instead of hpx::thread::id (which is a different type for arcane reasons). I will add the correct specialization asap (see https://github.com/STEllAR-GROUP/hpx/issues/5129).
Regards Hartmut --------------- <http://stellar.cct.lsu.edu> http://stellar.cct.lsu.edu <https://github.com/STEllAR-GROUP/hpx> https://github.com/STEllAR-GROUP/hpx From: hpx-users-boun...@stellar-group.org <hpx-users-boun...@stellar-group.org> On Behalf Of ct clmsn Sent: Tuesday, January 26, 2021 3:34 PM To: Hartmut Kaiser <hkai...@cct.lsu.edu> Cc: hpx-users@stellar-group.org Subject: Re: [hpx-users] advice hashing hpx::thread::id Hartmut, This looks like a slightly more subtle error. I'm deploying threads in this fashion (line 65): https://github.com/STEllAR-GROUP/hpx/blob/master/libs/parallelism/threading/tests/unit/thread_launching.cpp I've a situation where the code I'm working on attempts to store hpx::thread:id's into a std::unordered_set<hpx::thread::id, std::int32_t>. The compiler is throwing the following error: ".../c++/x.y.z/bits/hashtable_policy.h:87:34: error: no match for call to `(const std::hash<hpx::thread::id>) (const hpx::thread::id&)` The compiler (gnu) is complaining std::hash<> hasn't been specialized on hpx::thread::id. From my compilation errors, it looks like hpx::threads::id != hpx::thread::id. Lines 241 and 242 (thread_launching.cpp) have some commented out lines that look like the start of a template specialization on hpx::thread::id. For reference, line 75 specializes std::hash<> on hpx::threads::id not hpx::thread:id; this file: https://github.com/STEllAR-GROUP/hpx/blob/master/libs/core/threading_base/include/hpx/threading_base/threading_base_fwd.hpp Wasn't sure if ya'll have seen this issue before or not. Thanks for looking into this one! v/r, Chris On Tue, Jan 26, 2021 at 1:31 PM Hartmut Kaiser <hkai...@cct.lsu.edu <mailto:hkai...@cct.lsu.edu> > wrote: Chris, > i'm attempting to use std::hash<hpx::thread::id> and found a template > specialized version of std::hash<hpx::threads::id> in this file: > hpx/threading_base/threading_base_fwd.hpp > > The implementation makes use of a template specialized version of > std::hash<hpx::threads::thread_data const*>. > > Would recycling that code for hpx::thread::id and > hpx::threads::thread_data be sufficient or should I take another approach? std::hash<hpx::threads::id> should just work for you (because of the code you mentioned). What issues do you have? Thanks! Regards Hartmut --------------- http://stellar.cct.lsu.edu https://github.com/STEllAR-GROUP/hpx
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