The template specialization of std::formatter for the range types allows users to convert a range to its textual representation as a collection of elements or a string using formatting functions.
The specialization is derived from range-default-formatter<std::format_kind<R>, R, CharT>.
The specialization is enabled if R satisfies input_range, std::format_kind<R> is not std::range_format::disabled, and std::formattable<ranges::range_reference_t<R>, CharT> is true.
This specialization meets the Formatter requirements if const R models input_range and ranges::range_reference_t<const R> models std::formattable<CharT>. It always meets the BasicFormatter requirements.
The syntax of range-format-spec is:
range-fill-and-align (optional) width (optional)n(optional) range-type (optional) range-underlying-spec (optional)
The syntax is fully described in range format specification.
For specializations of std::formatter where std::format_kind<R> is either std::range_format::string or std::range_format::debug_string, the format-spec is std-format-spec instead of range-format-spec (which uses std::formatter<std::basic_string<CharT>, CharT> as the underlying formatter).
range-default-formatter [edit] Example [edit] See also
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