std::array::front
Da cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
| 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.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Índice |
[editar] Parâmetros
(Nenhum)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[editar] Valor de retorno
a referência ao primeiro elemento
Original:
reference to the first element
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[editar] Complexidade
Constante
Original:
Constant
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[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.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[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.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
#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) | |
