std::string_view back() method

since C++17

// Const version only
constexpr const_reference back() const;

Returns a reference

to the last character in the string_view.

Undefined Behavior

Calling back() on an empty string_view is undefined behavior

.

Parameters

(none)

Return value

Reference to the last character.

Complexity

Constant - O(1).

Notes

For a string_view str, the expression str.back() is equivalent to *std::prev(str.end()) and str[str.size() - 1].

Example

Main.cpp

#include <string_view>
#include <iostream>
 
int main() {
    for (std::string_view str{"ABCDEF"}; !str.empty(); str.remove_suffix(1))
        std::cout << str.back() << ' ' << str << '\n';
}

Output

F ABCDEF
E ABCDE
D ABCD
C ABC
B AB
A A