std::array::empty
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| constexpr bool empty(); |
(seit C++11) | |
Prüft, ob der Behälter keine Elemente, dh ob begin() == end() .
Original:
Checks if the container has no elements, i.e. whether begin() == end().
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Inhaltsverzeichnis |
[Bearbeiten] Parameter
(None)
Original:
(none)
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[Bearbeiten] Rückgabewert
true wenn der Behälter leer ist, false anders
Original:
true if the container is empty, false otherwise
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[Bearbeiten] Ausnahmen
[Bearbeiten] Komplexität
Constant
Original:
Constant
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[Bearbeiten] Beispiel
Der folgende Code verwendet
empty, um zu überprüfen, ob ein std::array<int> enthält alle Elemente:
Original:
The following code uses
empty to check if a std::array<int> contains any elements:
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#include <array> #include <iostream> int main() { std::array<int, 4> numbers {3, 1, 4, 1}; std::array<int, 0> no_numbers; std::cout << "numbers.empty(): " << numbers.empty() << '\n'; std::cout << "no_numbers.empty(): " << no_numbers.empty() << '\n'; }
Output:
numbers.empty(): 0 no_numbers.empty(): 1
See also
| liefert die Anzahl der Elemente Original: returns the number of elements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion) | |
