[format.fmt.string]

namespace std { template<class charT, class. Args> struct basic_format_string { private: basic_string_view<charT> str; / exposition only public: template<class T> consteval basic_format_string(const T& s); constexpr basic_format_string(runtime-format-string<charT> s) noexcept : str(s.str) {} constexpr basic_string_view<charT> get() const noexcept { return str; } }; }

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template<class T> consteval basic_format_string(const T& s);

Remarks: A call to this function is not a core constant expression ([expr.const]) unless there exist args of types Args such that str is a format string for args.

28 Text processing library [text]

28.5 Formatting [format]

28.5.4 Class template basic_format_string [format.fmt.string]