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std::vector::front

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< cpp‎ | container‎ | vector

 
 
 
std::vector
Las funciones miembro
Original:
Member functions
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Elemento acceso
Original:
Element access
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vector::front
Los iteradores
Original:
Iterators
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Capacidad
Original:
Capacity
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Modificadores
Original:
Modifiers
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reference front();
const_reference front() const;
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.
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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().
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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

access the last element
(función miembro público) [editar]