22 General utilities library [utilities]

22.14 Formatting [format]

22.14.7 Formatting of ranges [format.range]

22.14.7.4 Specialization of range-default-formatter for maps [format.range.fmtmap]

namespace std { template<ranges::input_range R, class charT> struct range-default-formatter<range_format::map, R, charT> { private: using maybe-const-map = fmt-maybe-const<R, charT>; // exposition only using element-type = // exposition only remove_cvref_t<ranges::range_reference_t<maybe-const-map>>; range_formatter<element-type, charT> underlying_; // exposition only public: constexpr range-default-formatter(); template<class ParseContext> constexpr typename ParseContext::iterator parse(ParseContext& ctx); template<class FormatContext> typename FormatContext::iterator format(maybe-const-map& r, FormatContext& ctx) const; }; }

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constexpr range-default-formatter();

Mandates: Either:

(1.1)
element-type is a specialization of pair, or
(1.2)
element-type is a specialization of tuple and tuple_size_v<element-type> == 2.

Effects: Equivalent to: underlying_.set_brackets(STATICALLY-WIDEN<charT>("{"), STATICALLY-WIDEN<charT>("}")); underlying_.underlying().set_brackets({}, {}); underlying_.underlying().set_separator(STATICALLY-WIDEN<charT>(": "));

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template<class ParseContext>
  constexpr typename ParseContext::iterator
    parse(ParseContext& ctx);

Effects: Equivalent to: return underlying_.parse(ctx);

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template<class FormatContext>
  typename FormatContext::iterator
    format(maybe-const-map& r, FormatContext& ctx) const;

Effects: Equivalent to: return underlying_.format(r, ctx);