Before f6b4a23b83 the function formatted_size() in compile.h was marked as FMT_CONSTEXPR20.
This allowed writing compile-time formatting using C++23's static constexpr members inside a constexpr function. E.g.:
template <fmt::detail::udl_compiled_string format, auto... values>
constexpr std::string_view constexpr_format() {
static constexpr auto str = [] {
constexpr auto result_length = fmt::formatted_size(format, values...);
auto result = std::array<char, result_length>{};
fmt::format_to(result.data(), format, values...);
return result;
}();
return std::string_view(str.data(), str.size());
}
However, since the linked commit, this annotation was removed. Looking at the commit, I can't figure out why this is the case. Is there any chance of re-introducing the constexpr on all functions that allow it in compile.h?
PS: fmt::counting_buffer::count() is not marked constexpr either. When I wrote the snippet above, an fmt::counting_iterator was used instead in fmt::formatted_size() (but this iterator was removed in ba36a0481).
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