Re: [boost] [multi_index] Taking advantage of C++17 auto template params to simplify key specification

Definitely interesting to me. Also key_tuple<...> which would automatically tie a number of elements? On 27 September 2017 at 13:23, Andrey Semashev via Boost < boost@lists.boost.org> wrote:

On 09/27/17 13:53, Joaquin M López Muñoz via Boost wrote:

...

Consider the following:

struct element { int x; int f()const{return x;} };

int gf(const element& e){return e.x;}

using container=multi_index_container< element, indexed_by< ordered_unique>, ordered_unique>, ordered_unique> >

...

;

With the advent in C++17 of auto non-type template parameters, it is very easy to provide a boost::multi_index::key class template so that we can write:

using container=multi_index_container< element, indexed_by< ordered_unique>, ordered_unique>, ordered_unique> >

...

;

(Example at http://coliru.stacked-crooked.com/a/5742c768cc093c03 ).

Is there interest in adding this to Boost.MultiIndex? Comments on this or alternative syntaxes?

Looks interesting. The C++03 version always seemed verbose to me. Will it also support function objects for key extraction?

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