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Difference between revisions of "cpp/container/vector/pop back"

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< cpp‎ | container‎ | vector
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Revision as of 16:25, 2 November 2012

[edit template]
 
C++
 
Containers library
 
std::vector
Member types
Member functions
Non-member functions
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides(C++17)
 
void pop_back();
 (constexpr 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 are invalidated. The end() iterator is also invalidated.

Contents

Parameters

(none)

Return value

(none)

Complexity

Constant.

Exceptions

Throws nothing.

Example

Run this code
#include <vector>
#include <iostream>
 
namespace stq {
template<typename T>
void println(auto, const T& xz)
{
    std::cout << '[';
    bool first{true};
    for (auto const& x : xz)
        std::cout << (first ? first = false, "" : ", ") << x;
    std::cout << "]\n";
}
}
 
int main()
{
    std::vector<int> numbers{1, 2, 3};
    stq::println("{}", numbers);
    while (not numbers.empty())
    {
        numbers.pop_back();
        stq::println("{}", numbers);
    }
}

Output: 

[1, 2, 3]
[1, 2]
[1]
[]

See also

 adds an element to the end
(public member function) [edit]
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