std::vector::back

 

C++

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Понятия (концепции)

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Контейнеры

Алгоритмы

Итераторы

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Ввод / вывод

Локализация

Регулярные выражения (C++11)

Атомарные примитивы (C++11)

Потоки (C++11)

 

Контейнеры

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

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std::vector

Член функций Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::vector

vector::~vector

vector::operator=

vector::assign

vector::get_allocator

Элемент доступа Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::at

vector::operator[]

vector::front

vector::back

vector::data (C++11)

Итераторы Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::begin vector::cbegin (C++11)

vector::end vector::cend (C++11)

vector::rbegin vector::crbegin (C++11)

vector::rend vector::crend (C++11)

Потенциала Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::empty

vector::size

vector::max_size

vector::reserve

vector::capacity

vector::shrink_to_fit (C++11)

Модификаторы Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

vector::clear

vector::insert

vector::emplace (C++11)

vector::erase

vector::push_back

vector::emplace_back (C++11)

vector::pop_back

vector::resize

vector::swap

 

reference back();
const_reference back() const;

Возвращает ссылку на последний элемент в контейнере.

Original:

Returns reference to the last element in the container.

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Вызов back на пустой контейнер не определен.

Original:

Calling back on an empty container is undefined.

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Параметры

(Нет)

Original:

(none)

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Возвращаемое значение

ссылка на последний элемент

Original:

reference to the last element

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Сложность

Constant

Original:

Constant

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Notes

Для контейнера c, выражение return c.back(); эквивалентно { auto tmp = c.end(); --tmp; return *tmp; }

Original:

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

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Пример

Следующий код использует back для отображения последнего элемента std::vector<char>

Original:

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

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#include <vector>
#include <iostream>
 
int main()
{
    std::vector<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The last character is: " << letters.back() << '\n';
    }
}

Вывод:

The last character is f

См. также

front	предоставляет доступ к первому элементу (public функция-член)