Thanks for the explanation, but if Key is POD type, we still can not using const reference ? regards - On Wed, Aug 29, 2018 at 4:25 PM Thorsten Ottosen via Boost wrote:

Den 27-08-2018 kl. 15:03 skrev comic fans via Boost:

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Hello , I've found that ptr_unordered_map.insert has following signature (from code and latest doc)

std::pair insert( key_type& k, T* x );

that forbids calls like ptr_unordered_map.insert( myobj->id(), myobj) ,I wonder if this is by design , or some other reason ? why other overload takes const key_type& k as key type? and insert always call insert_impl which have const reference as key type ? any help would be appreciated.

It is by design.

https://www.boost.org/doc/libs/1_67_0/libs/ptr_container/doc/faq.html#why-do...

regards

-Thorsten

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ok, I may take a try regards On Wed, Aug 29, 2018 at 6:52 PM Thorsten Ottosen wrote:

Den 29-08-2018 kl. 12:10 skrev comic fans:

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Thanks for the explanation, but if Key is POD type, we still can not using const reference ? yeah, I guess one could put an overload via enable_if if the copy-constructor was noexcept.

-T

-- Best regards, Thorsten Jørgen Ottosen, Ph.D. Director of Research +45 23308797 Dezide (www.dezide.com)