std::vector::back – cppreference.com
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Gibt Bezugnahme auf das letzte Element in dem Behälter .
Original:
Returns reference to the last element in the container.
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Aufruf back auf einem leeren Behälter undefined .
Original:
Calling back on an empty container is undefined.
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Parameter
(None)
Original:
(none)
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Rückgabewert
Bezugnahme auf das letzte Element
Original:
reference to the last element
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Komplexität
Constant
Original:
Constant
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Notes
Für einen Behälter c ist die Expression return c.back(); entspricht { auto tmp = c.end(); --tmp; return *tmp; }
Original:
For a container c, the expression return c.back(); is equivalent to { auto tmp = c.end(); --tmp; return *tmp; }
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Beispiel
Der folgende Code verwendet back um das letzte Element einer std::vector<char> anzuzeigen:
Original:
The following code uses back to display the last 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 last character is: " << letters.back() << '\n'; } }
Output:
Siehe auch
Zugriff auf das erste Element Original: access the first element The text has been machine-translated via Google Translate. (öffentliche Elementfunktion) [edit] | |