Can I have a specialization of a range formatter?

[Sebanisu]

Might be related to #4123

I noticed if I include fmt/ranges.h this formatter will no longer work. It's a wip formatter. my tile formatter puts out too much data. So I wanted to make a summery output for when formatting the range. I was thinking it'd be nice to have both as I'd like to put some ranges of numbers into the output sometimes.

I thought since my concept is specific to only tile ranges. It would override the one in fmt/ranges.h. But that isn't the case. Maybe it's because you use SFINAE or std::enable_if.

template<typename range_t>
concept tile_range = std::ranges::range<range_t> && open_viii::graphics::background::is_tile<std::ranges::range_value_t<range_t>>;

// Specialization for ranges of tiles
template<tile_range TileRange>
struct fmt::formatter<TileRange> : fmt::formatter<std::string>
{
     // parse is inherited from formatter<string_view>.
     template<typename FormatContext>
     constexpr auto format(const TileRange &tiles, FormatContext &ctx) const
     {
          const auto count = std::ranges::distance(tiles);


          return fmt::format_to(ctx.out(), "Total Tiles: {}\n", count);
     }
};

[vitaut]

You should be able to opt out of range formatting by specializing fmt::is_range: https://github.com/fmtlib/fmt/blob/41539c29f342e67abb925b946acab6d55d331b36/include/fmt/ranges.h#L346C45-L346C53.

[Sebanisu]

template<tile_range TileRange>
struct fmt::is_range<TileRange, char> : std::false_type
{
};

Ah, I see. Thank you!