std::array::back
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| reference back(); |
(desde C++11) | |
| const_reference back() const; |
(desde 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.The text has been machine-translated via Google Translate.
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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; }The text has been machine-translated via Google Translate.
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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'; } }
Saída:
The last character is f
[editar] Veja também
| acesso ao primeiro elemento Original: access the first element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
