cppdraft_translate/cppdraft/depr/format/arg.md

[depr.format.arg]

Annex D (normative) Compatibility features [depr]

D.20 Deprecated formatting [depr.format]

D.20.2 Formatting arguments [depr.format.arg]

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template<class Visitor, class Context> decltype(auto) visit_format_arg(Visitor&& vis, basic_format_arg<Context> arg);

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Effects: Equivalent to: return visit(std​::​forward(vis), arg.value);