constexpr string_view operator""sv(const char* str, size_t len) noexcept;
Returns:
string_view{str, len}. constexpr u8string_view operator""sv(const char8_t* str, size_t len) noexcept;
Returns:
u8string_view{str, len}. constexpr u16string_view operator""sv(const char16_t* str, size_t len) noexcept;
Returns:
u16string_view{str, len}. constexpr u32string_view operator""sv(const char32_t* str, size_t len) noexcept;
Returns:
u32string_view{str, len}. constexpr wstring_view operator""sv(const wchar_t* str, size_t len) noexcept;
Returns:
wstring_view{str, len}.