Fmt: 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 https://github.com/fmtlib/fmt/pull/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 [e-mail]:

From #1584 https://github.com/fmtlib/fmt/pull/1584, it looks like
@vsolontsov-ll https://github.com/vsolontsov-ll already had some ideas
for how to support named arguments. Any update there?

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[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.