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std::array::back

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< cpp‎ | container‎ | array

 
 
 
std::array
Funções de membro
Original:
Member functions
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acesso. Elemento
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteradores
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacidade
Original:
Capacity
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array::empty
array::size
array::max_size
Modificadores
Original:
Modifiers
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array::fill
array::swap
Não-membros funções
Original:
Non-member functions
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get
swap
Classes auxiliares
Original:
Helper classes
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tuple_size
tuple_element
 
reference back();
(a partir do C++ 11)
const_reference back() const;
(a partir do C++ 11)
Retorna referência ao último elemento do recipiente.
Original:
Returns reference to the last element in the container.
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Chamando back em um recipiente vazio é indefinido.
Original:
Calling back on an empty container is undefined.
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Índice

[editar] Parâmetros

(Nenhum)
Original:
(none)
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[editar] Valor de retorno

referência para o último elemento
Original:
reference to the last element
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[editar] Complexidade

Constante
Original:
Constant
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[editar] Notas

Para uma c recipiente, o return c.back(); expressão é equivalente a { 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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[editar] Exemplo

O código a seguir usa back para exibir o último elemento de uma std::array<char>:
Original:
The following code uses back to display the last element of a std::array<char>:
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#include <array>
#include <iostream>
 
int main()
{
    std::array<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The last character is: " << letters.back() << '\n';
    }  
}

Output:

The last character is f

[editar] Veja também

acesso ao primeiro elemento
Original:
access the first element
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(função pública membro) [edit]