21 Strings library [strings]

21.4 String view classes [string.view]

21.4.2 Class template basic_string_view [string.view.template]

21.4.2.3 Capacity [string.view.capacity]

constexpr size_type size() const noexcept;

1

Returns: size_.

constexpr size_type length() const noexcept;

2

Returns: size_.

constexpr size_type max_size() const noexcept;

3

Returns: The largest possible number of char-like objects that can be referred to by a basic_string_view.

constexpr bool empty() const noexcept;

4

Returns: size_ == 0.