Dynamic construction of *named* argument lists?

[suo]

Hey, I noticed in the latest release that there is now a dynamic_format_arg_store, but it doesn't support named arguments. Is there a plan to add such capability? I'm thinking of something along the lines of:

fmt::dynamic_format_named_argument_store<fmt::format_context> store;
store.emplace_back("name", 123);
store.emplace_back("another_name", 456);
fmt::vprint("{name} + {another_name}", store);

Would this be hard to implement? I can take a crack at it given some starting guidance.

[suo]

From #1584, it looks like @vsolontsov-ll already had some ideas for how to support named arguments. Any update there?

[vsolontsov-ll]

I was going to add support for named arguments during May holidays in Russia. чт, 30 апр. 2020 г., 09:33 Michael Suo <notifications@github.com>:

…

From #1584 <#1584>, it looks like @vsolontsov-ll <https://github.com/vsolontsov-ll> already had some ideas for how to support named arguments. Any update there? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#1655 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ANMY27HIJZMTK6J53MRMXVDRPELUVANCNFSM4MVG6VKA> .

[suo]

Amazing :) Thank you for your effort!

[vitaut]

Thanks, @vsolontsov-ll, for looking into it.

[vitaut]

And BTW thanks, @suo, for adding {fmt} to pytorch!

[vitaut]

Reopening since this still needs to be documented.

[vitaut]

Documented in https://fmt.dev/dev/api.html#_CPPv2N3fmt24dynamic_format_arg_storeE.