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

 

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Deduction guides(C++17)

 

void pop_back();		(until C++20)
constexpr void pop_back();		(since C++20)

Removes the last element of the container.

Calling pop_back on an empty container results in undefined behavior.

Iterators and references to the last element, as well as the end() iterator, are invalidated.

Parameters

(none)

Return value

(none)

Complexity

Constant.

Exceptions

Throws nothing.

Example

Run this code

#include <vector>
#include <iostream>
 
template<typename T>
void print(T const & xs)
{
    std::cout << "[ ";
    for(auto const & x : xs) {
        std::cout << x << ' ';
    }
    std::cout << "]\n";
}
 
int main()
{
    std::vector<int> numbers;
 
    print(numbers); 
 
    numbers.push_back(5);
    numbers.push_back(3);
    numbers.push_back(4);
 
    print(numbers); 
 
    numbers.pop_back();
 
    print(numbers); 
}

Output:

[ ]
[ 5 3 4 ]
[ 5 3 ]

See also

push_back

adds an element to the end (public member function)