std::multimap::empty – cppreference.com

std::multimap::empty

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<metanoindex/>

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

(None)
Original:
(none)
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Rückgabewert

true wenn der Behälter leer ist, false anders
Original:
true if the container is empty, false otherwise
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Ausnahmen

noexcept specification:  
<tbody> </tbody>
noexcept
  (seit C++11)

Komplexität

Constant
Original:
Constant
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Beispiel

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