22 General utilities library [utilities]

22.13 Primitive numeric conversions [charconv]

22.13.1 Header <charconv> synopsis [charconv.syn]

When a function is specified with a type placeholder of integer-type, the implementation provides overloads for all cv-unqualified signed and unsigned integer types and char 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.
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 { char* ptr; errc ec; friend bool operator==(const to_chars_result&, const to_chars_result&) = default; }; constexpr to_chars_result to_chars(char* first, char* last, integer-type value, int base = 10); to_chars_result to_chars(char* first, char* last, bool value, int base = 10) = delete; to_chars_result to_chars(char* first, char* last, floating-point-type value); to_chars_result to_chars(char* first, char* last, floating-point-type value, chars_format fmt); to_chars_result to_chars(char* first, char* last, floating-point-type value, chars_format fmt, int precision); // [charconv.from.chars], primitive numerical input conversion struct from_chars_result { const char* ptr; errc ec; friend bool operator==(const from_chars_result&, const from_chars_result&) = default; }; constexpr from_chars_result from_chars(const char* first, const char* last, integer-type& value, int base = 10); from_chars_result from_chars(const char* first, const char* last, 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.