std::vector<T,Allocator>::back

< cpp‎ | container‎ | vector

 
C++
 
Containers library
 
std::vector
 
reference back();
const_reference back() const;

Returns reference to the last element in the container.

Calling back on an empty container is undefined.

Parameters

(none)

Return value

Reference to the last element.

Complexity

Constant.

Notes

For a container c, the expression return c.back(); is equivalent to { auto tmp = c.end(); --tmp; return *tmp; }

Example

The following code uses back to display the last element of a std::vector<char>:

Run this code
#include <vector>
#include <iostream>
 
int main()
{
    std::vector<char> letters {'a', 'b', 'c', 'd', 'e', 'f'};
    if (!letters.empty()) {
        std::cout << "The last character is: " << letters.back() << '\n';
    }  
}

Output: 

The last character is f

See also

 access the first element
(public member function)