23 Strings library [strings]

23.4 String classes [string.classes]

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

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constexpr string operator""s(const char* str, size_t len);
1
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Returns: string{str, len}.
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constexpr u8string operator""s(const char8_t* str, size_t len);
2
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Returns: u8string{str, len}.
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constexpr u16string operator""s(const char16_t* str, size_t len);
3
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Returns: u16string{str, len}.
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constexpr u32string operator""s(const char32_t* str, size_t len);
4
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Returns: u32string{str, len}.
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constexpr wstring operator""s(const wchar_t* str, size_t len);
5
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Returns: wstring{str, len}.
6
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[Note 1: 
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]