24 Containers library [containers]

24.6 Container adaptors [container.adaptors]

24.6.13 Container adaptors formatting [container.adaptors.format]

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For each of queue, priority_queue, and stack, the library provides the following formatter specialization where adaptor-type is the name of the template:
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namespace std { template<class charT, class T, formattable<charT> Container, class... U> struct formatter<adaptor-type<T, Container, U...>, charT> { private: using maybe-const-container = // exposition only fmt-maybe-const<Container, charT>; using maybe-const-adaptor = // exposition only maybe-const<is_const_v<maybe-const-container>, // see [ranges.syn] adaptor-type<T, Container, U...>>; formatter<ranges::ref_view<maybe-const-container>, charT> underlying_; // exposition only public: template<class ParseContext> constexpr typename ParseContext::iterator parse(ParseContext& ctx); template<class FormatContext> typename FormatContext::iterator format(maybe-const-adaptor& r, FormatContext& ctx) const; }; }
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template<class ParseContext> constexpr typename ParseContext::iterator parse(ParseContext& ctx);
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Effects: Equivalent to: return underlying_.parse(ctx);
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template<class FormatContext> typename FormatContext::iterator format(maybe-const-adaptor& r, FormatContext& ctx) const;
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Effects: Equivalent to: return underlying_.format(r.c, ctx);