28 Text processing library [text]

28.2 Primitive numeric conversions [charconv]

28.2.1 Header <charconv> synopsis [charconv.syn]

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When a function is specified with a type placeholder of integer-type, the implementation provides overloads for char and all cv-unqualified 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); }
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The type chars_format is a bitmask type ([bitmask.types]) with elements scientific, fixed, and hex.
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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.