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std::set::empty

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C++
 
Container-Bibliothek
 
std::set
Member-Funktionen
Original:
Member functions
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set::set
set::~set
set::operator=
set::get_allocator
Iteratoren
Original:
Iterators
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set::begin
set::cbegin
(C++11)
set::end
set::cend
(C++11)
set::rbegin
set::crbegin
(C++11)
set::rend
set::crend
(C++11)
Kapazität
Original:
Capacity
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set::empty
set::size
set::max_size
Modifiers
Original:
Modifiers
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set::clear
set::insert
set::emplace(C++11)
set::emplace_hint(C++11)
set::erase
set::swap
Lookup
Original:
Lookup
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set::count
set::find
set::equal_range
set::lower_bound
set::upper_bound
Beobachter
Original:
Observers
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set::key_comp
set::value_comp
 
bool empty() const;
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

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Komplexität

Constant
Original:
Constant
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[Bearbeiten] Beispiel

Der folgende Code verwendet empty, um zu überprüfen, ob ein std::set<int> enthält alle Elemente:
Original:
The following code uses empty to check if a std::set<int> contains any elements:
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#include <set>
#include <iostream>
 
int main()
{
    std::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
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