20 General utilities library [utilities]

20.19 Primitive numeric conversions [charconv]

20.19.1 Header <charconv> synopsis [charconv.syn]

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; }; to_chars_result to_chars(char* first, char* last, see below 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, float value); to_chars_result to_chars(char* first, char* last, double value); to_chars_result to_chars(char* first, char* last, long double value); to_chars_result to_chars(char* first, char* last, float value, chars_format fmt); to_chars_result to_chars(char* first, char* last, double value, chars_format fmt); to_chars_result to_chars(char* first, char* last, long double value, chars_format fmt); to_chars_result to_chars(char* first, char* last, float value, chars_format fmt, int precision); to_chars_result to_chars(char* first, char* last, double value, chars_format fmt, int precision); to_chars_result to_chars(char* first, char* last, long double 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; }; from_chars_result from_chars(const char* first, const char* last, see below& value, int base = 10); from_chars_result from_chars(const char* first, const char* last, float& value, chars_format fmt = chars_format::general); from_chars_result from_chars(const char* first, const char* last, double& value, chars_format fmt = chars_format::general); from_chars_result from_chars(const char* first, const char* last, long double& 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.