std::list::empty

 

C++

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Reguläre Ausdrücke Bibliothek(C++11)

Atomare Operationen Bibliothek(C++11)

Thread Support-Bibliothek(C++11)

 

Container-Bibliothek

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

 

std::list

Member-Funktionen Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::list

list::~list

list::operator=

list::assign

list::get_allocator

Elementzugriff zerstört Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::front

list::back

Iteratoren Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::begin list::cbegin (C++11)

list::end list::cend (C++11)

list::rbegin list::crbegin (C++11)

list::rend list::crend (C++11)

Kapazität Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::empty

list::size

list::max_size

Modifiers Original: Modifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::clear

list::insert

list::emplace (C++11)

list::erase

list::push_front

list::emplace_front (C++11)

list::pop_front

list::push_back

list::emplace_back (C++11)

list::pop_back

list::resize

list::swap

Operations Original: Operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

list::merge

list::splice

list::remove list::remove_if

list::reverse

list::unique

list::sort

 

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:  

noexcept

  (seit C++11)

Komplexität

Constant

Original:

Constant

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Beispiel

Der folgende Code verwendet empty, um zu überprüfen, ob ein std::list<int> enthält alle Elemente:

Original:

The following code uses empty to check if a std::list<int> contains any elements:

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#include <list>#include <iostream>   int main(){std::list<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

size	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)