std::array::front - cppreference.com
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(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.
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Parâmetros
(Nenhum)
Original:
(none)
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Valor de retorno
a referência ao primeiro elemento
Original:
reference to the first element
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Complexidade
Constante
Original:
Constant
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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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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'; } }
Saída:
See also
| access the last element (função pública membro) [edit] | |