24 Strings library [strings]

24.3 String classes [string.classes]

24.3.6 Suffix for basic_­string literals [basic.string.literals]

string operator""s(const char* str, size_t len);
1
#
Returns: string{str, len}.
u16string operator""s(const char16_t* str, size_t len);
2
#
Returns: u16string{str, len}.
u32string operator""s(const char32_t* str, size_t len);
3
#
Returns: u32string{str, len}.
wstring operator""s(const wchar_t* str, size_t len);
4
#
Returns: wstring{str, len}.
5
#
[ Note
:
The same suffix s is used for chrono​::​duration literals denoting seconds but there is no conflict, since duration suffixes apply to numbers and string literal suffixes apply to character array literals.
— end note
 ]