std::basic_string_view::back

From cppreference.com
constexpr const_reference back() const;
(since C++17)

Returns reference to the last character in the view. The behavior is undefined if empty() == true.

Parameters

(none)

Return value

Reference to the last character, equivalent to operator[](size() - 1).

Complexity

Constant.

See also

accesses the first character
(public member function)
checks whether the view is empty
(public member function)