std::experimental::basic_string_view<CharT,Traits>:: max_size

From cppreference.com
constexpr size_type max_size ( ) const noexcept ;
(library fundamentals TS)

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

Parameters

(none)

Return value

Maximum number of characters.

Complexity

Constant.

See also

returns the number of characters
(public member function)
checks whether the view is empty
(public member function)