std::vector::front
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reference front(); |
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const_reference front() const; |
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Devuelve una referencia al primer elemento en el recipiente .
Original:
Returns a reference to the first element in the container.
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Llamar a
front
en un recipiente vacío es indefinido .Original:
Calling
front
on an empty container is undefined.The text has been machine-translated via Google Translate.
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Contenido |
[editar] Parámetros
(Ninguno)
Original:
(none)
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[editar] Valor de retorno
referencia al primer elemento
Original:
reference to the first element
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[editar] Complejidad
Constant
Original:
Constant
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[editar] Notas
Para una
c
contenedor, el c.front() expresión es 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] Ejemplo
El código siguiente utiliza
front
para mostrar el primer elemento de una std::vector<char>:
Original:
The following code uses
front
to display the first 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 first character is: " << letters.front() << '\n'; } }
Salida:
The first character is o
See also
accede al último elemento Original: access the last element The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función miembro público) |