22 General utilities library [utilities]

22.14 Formatting [format]

22.14.7 Formatting of ranges [format.range]

22.14.7.6 Specialization of range-default-formatter for strings [format.range.fmtstr]

namespace std { template<range_format K, ranges::input_range R, class charT> requires (K == range_format::string || K == range_format::debug_string) struct range-default-formatter<K, R, charT> { private: formatter<basic_string<charT>, charT> underlying_; // exposition only public: template<class ParseContext> constexpr typename ParseContext::iterator parse(ParseContext& ctx); template<class FormatContext> typename FormatContext::iterator format(see below& str, FormatContext& ctx) const; }; }

Mandates: same_as<remove_cvref_t<range_reference_t<R>>, charT> is true.

🔗

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

Effects: Equivalent to: auto i = underlying_.parse(ctx); if constexpr (K == range_format::debug_string) { underlying_.set_debug_format(); } return i;

🔗

template<class FormatContext>
  typename FormatContext::iterator
    format(see below& r, FormatContext& ctx) const;

The type of r is const R& if ranges::input_range<const R> is true and R& otherwise.

Effects: Let s be a basic_string<charT> such that ranges::equal(s, r) is true.

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