[basic.string.literals]

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constexpr string operator""s(const char* str, size_t len);

Returns: string{str, len}.

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constexpr u8string operator""s(const char8_t* str, size_t len);

Returns: u8string{str, len}.

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constexpr u16string operator""s(const char16_t* str, size_t len);

Returns: u16string{str, len}.

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constexpr u32string operator""s(const char32_t* str, size_t len);

Returns: u32string{str, len}.

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constexpr wstring operator""s(const wchar_t* str, size_t len);

[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]

27 Strings library [strings]

27.4 String classes [string.classes]

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