Thousands separator problem

[w17]

I found some problems using library in farmanager project for {i:n} format.

1. [Bug]
   Thousands separator is always char in library. It caused problem when separator is unicode character wider than 1 byte. It is very possible in windows case.

2. [Feature request]
   For now there is no way to customize separator manually.
   In farmanager thousands separator is configurable [optional].
   Is it possible to pass that custom value to library?

There is link to discussion on farmanager bugtracker: http://bugs.farmanager.com/view.php?id=3382

[vitaut]

Both issues are addressed in the new experimental version of the library. This version is located in the std branch and described in the standards proposal http://fmtlib.net/Text%20Formatting.html.

The first issue is solved by using C++ locales that support wide thousands separator character.

Thousands separator can be customized by passing a custom locale via a buffer.

[w17]

Can that fatures arrive in the release?

[vitaut]

Yes, these features/fixes will be a part of the next major release (since replacing C with C++ locales is a breaking change).

[vitaut]

Fixed in the std branch.

[cruisercoder]

Is there a way to limit the width for thousand separated fields?

fmt::format("{:<5n}", 12345678) // want 12,34 but get 12,345,678

[vitaut]

Is there a way to limit the width for thousand separated fields?

Yes, use format_to_n: https://fmt.dev/latest/api.html#_CPPv2N3fmt11format_to_nE8OutputItNSt6size_tERK1SDpRK4Args

[cruisercoder]

good to know, but I frequently use fmt for fixed with tables like below. Can I control the padding (not necessarily overflow) for the 2nd item?

fmt::format("{:<50.50}{:<12.12}{<:12.12}\n", "ITEM", "COST","RATING") // header
fmt::format("{:<50.50}{:<12n}{<:12.12}\n", item,cost,rating);

[vitaut]

Can I control the padding (not necessarily overflow) for the 2nd item?

You can control the minimum width but not the maximum width. The latter can be controlled via a nested call to format.