std::array::front
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reference front(); | (desde C++11) | |
const_reference front()const; | (desde C++11) | |
Devolve uma referência para o primeiro elemento no contentor.
Original:
Returns a reference to the first element in the container.
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Chamando
front em um recipiente vazio é indefinido.Original:
Calling
front 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
a referência ao primeiro elemento
Original:
reference to the first element
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[editar]Complexidade
Constante
Original:
Constant
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[editar]Notas
Para uma
c recipiente, o c.front() expressão é equivalente a *c.begin().Original:
For a container
c, the expression c.front() is equivalent to *c.begin().The text has been machine-translated via Google Translate.
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[editar]Exemplo
O código a seguir usa
front para exibir o primeiro elemento de um std::array<char>: Original:
The following code uses
front to display the first 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 first character is: "<< letters.front()<<'\n';}}
Saída:
The first character is o
See also
| access the last element (função pública membro) | |
