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>: The text has been machine-translated via Google Translate.
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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) | |
