[charconv.syn]

When a function is specified with a type placeholder of integer-type, the implementation provides overloads for char and all signed and unsigned integer types in lieu of integer-type.

When a function is specified with a type placeholder of floating-point-type, the implementation provides overloads for all cv-unqualified floating-point types ([basic.fundamental]) in lieu of floating-point-type.

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namespace std { / floating-point format for primitive numerical conversion enum class chars_format { scientific = unspecified, fixed = unspecified, hex = unspecified, general = fixed | scientific }; / [charconv.to.chars], primitive numerical output conversion struct to_chars_result { / freestanding char* ptr; errc ec; friend bool operator=(const to_chars_result&, const to_chars_result&) = default; constexpr explicit operator bool() const noexcept { return ec == errc{}; } }; constexpr to_chars_result to_chars(char* first, char* last, / freestanding integer-type value, int base = 10); to_chars_result to_chars(char* first, char* last, / freestanding bool value, int base = 10) = delete; to_chars_result to_chars(char* first, char* last, / freestanding-deleted floating-point-type value); to_chars_result to_chars(char* first, char* last, / freestanding-deleted floating-point-type value, chars_format fmt); to_chars_result to_chars(char* first, char* last, / freestanding-deleted floating-point-type value, chars_format fmt, int precision); / [charconv.from.chars], primitive numerical input conversion struct from_chars_result { / freestanding const char* ptr; errc ec; friend bool operator=(const from_chars_result&, const from_chars_result&) = default; constexpr explicit operator bool() const noexcept { return ec == errc{}; } }; constexpr from_chars_result from_chars(const char* first, const char* last, / freestanding integer-type& value, int base = 10); from_chars_result from_chars(const char* first, const char* last, / freestanding-deleted floating-point-type& value, chars_format fmt = chars_format::general); }

The type chars_format is a bitmask type ([bitmask.types]) with elements scientific, fixed, and hex.

The types to_chars_result and from_chars_result have the data members and special members specified above.

They have no base classes or members other than those specified.