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std::array::front

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< cpp‎ | container‎ | array

 
 
 
std::array
Funções de membro
Original:
Member functions
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acesso. Elemento
Original:
Element access
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array::at
array::operator[]
array::front
array::back
array::data
Iteradores
Original:
Iterators
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array::begin
array::cbegin
array::end
array::cend
array::rbegin
array::crbegin
array::rend
array::crend
Capacidade
Original:
Capacity
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array::empty
array::size
array::max_size
Modificadores
Original:
Modifiers
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array::fill
array::swap
Não-membros funções
Original:
Non-member functions
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get
swap
Classes auxiliares
Original:
Helper classes
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tuple_size
tuple_element
 
reference front();
(a partir do C++ 11)
const_reference front() const;
(a partir do 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.
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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().
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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>:
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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';
    }  
}

Output:

The first character is o

See also

access the last element
(função pública membro) [edit]