20 Strings library [strings]

20.4 String view classes [string.view]

20.4.2 Class template basic_­string_­view [string.view.template]

20.4.2.3 Capacity [string.view.capacity]

constexpr size_type size() const noexcept; constexpr size_type length() const noexcept;
Returns: size_­.
constexpr size_type max_size() const noexcept;
Returns: The largest possible number of char-like objects that can be referred to by a basic_­string_­view.
[[nodiscard]] constexpr bool empty() const noexcept;
Returns: size_­ == 0.