Fmt: std::format

[DBJDBJ]

I might have missed something ... I can not find std::format referent implementation?

[vitaut]

fmt::format is a reference implementation of std::format. It is in a different namespace because {fmt} is not a standard library and shouldn't define names in std.

[DBJDBJ]

Many thanks @vitaut

I am slightly confused: it appears std::format is a subset of fmt::format?

One might expect C++20 std will contain ? All in one header which now is not the case.
There is talk about this "std branch" but it is not in the fmt github as of today?

I beg to differ {fmt} appears not to be the "reference implementation of std::format" ...
There is currently no implementation as described in the WG21 doc?

[vitaut]

it appears std::format is a subset of fmt::format?

Yes.

One might expect C++20 std will contain ?

C++20 will contain everything described in the paper (http://wg21.link/p0645): format, format_to, format_to_n, formatted_size and the extension API (formatter specializations).

There is talk about this "std branch" but it is not in the fmt github as of today?

That's because the std branch has been merged into master after the paper has been published.

[DBJDBJ]

ok ... call me spoiled but :) can we have one header file as described in the summary .. with top level namespace for example std_fmt ... :)

one might assume this is (almost) what is now in the core?

[vitaut]

Unfortunately there is no header that only has what's in the standard and it would be a lot of work to maintain such subset. However, if you want all that's in the standard (modulo minor inconsistencies that are being fixed) then fmt/format.h is your header and std_fmt is just fmt.

[DBJDBJ]

@vitaut many thanks for dialogue. I understand there is probably no "fmt team" and it is only you., and you are busy

[dkozel]

I came looking for the same thing as DBJDBJ, a bridge to use std::format in a C++14 project since we're unlikely to be able to move to C++20 for another 5+ years sadly (we're only moving to c++14 this year).

It would be very helpful to have a note somewhere about discrepancies between fmt/format.h and std::format in C++20.

Thanks for all your work on the standard and for making this library easy to include in projects!

[vitaut]

It would be very helpful to have a note somewhere about discrepancies between fmt/format.h and std::format in C++20.

Opened a separate issue: #1686.

[DBJDBJ]

Great, we are getting somewhere at last. Thanks to @vitaut again.
I am also vitally interested in char8_t handling, but that is a wider story where {fmt} position me thinks is best to avoid it ...