std::unordered_set::empty
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<metanoindex/>
<tbody> </tbody> bool empty() const; |
(seit C++11) | |
Prft, ob der Behlter keine Elemente, dh ob
begin() == end() .Original:
Checks if the container has no elements, i.e. whether
begin() == end().The text has been machine-translated via Google Translate.
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Parameter
(None)
Original:
(none)
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Rckgabewert
true wenn der Behlter leer ist, false andersOriginal:
true if the container is empty, false otherwiseThe text has been machine-translated via Google Translate.
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Ausnahmen
Komplexitt
Constant
Original:
Constant
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Beispiel
Der folgende Code verwendet
empty, um zu berprfen, ob ein std::unordered_set<int> enthlt alle Elemente:
Original:
The following code uses
empty to check if a std::unordered_set<int> contains any elements:
The text has been machine-translated via Google Translate.
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#include <unordered_set>
#include <iostream>
int main()
{
std::unordered_set<int> numbers;
std::cout << "Initially, numbers.empty(): " << numbers.empty() << '\n';
numbers.push_back(42);
numbers.push_back(13317);
std::cout << "After adding elements, numbers.empty(): " << numbers.empty() << '\n';
}
Output:
Initially, numbers.empty(): 1
After adding elements, numbers.empty(): 0
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. (ffentliche Elementfunktion) | |