std::list::front – cppreference.com

std::list::front

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<metanoindex/>

 
C++
 
Container-Bibliothek
 
std::list
Member-Funktionen
Original:
Member functions
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list::list
list::~list
list::operator=
list::assign
list::get_allocator
Elementzugriff zerstört
Original:
Element access
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list::front
list::back
Iteratoren
Original:
Iterators
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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
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list::empty
list::size
list::max_size
Modifiers
Original:
Modifiers
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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
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list::merge
list::splice
list::remove
list::remove_if
list::reverse
list::unique
list::sort
 
<tbody> </tbody>
reference front();
const_reference front() const;
Eine Referenz auf das erste Element in dem Behälter .
Original:
Returns a reference to the first element in the container.
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Aufruf front auf einem leeren Behälter undefined .
Original:
Calling front on an empty container is undefined.
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Parameter

(None)
Original:
(none)
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Rückgabewert

Verweisen auf das erste Element
Original:
reference to the first element
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Komplexität

Constant
Original:
Constant
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Notes

Für einen Behälter c ist die Expression c.front() entspricht *c.begin() .
Original:
For a container c, the expression c.front() is equivalent to *c.begin().
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Beispiel

Der folgende Code verwendet front um das erste Element einer std::list<char> anzuzeigen:
Original:
The following code uses front to display the first element of a std::list<char>:
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#include <list>
#include <iostream>
 
int main()
{
    std::list<char> letters {'o', 'm', 'g', 'w', 't', 'f'};
 
    if (!letters.empty()) {
        std::cout << "The first character is: " << letters.front() << '\n';
    }  
}

Output: 

The first character is o

See also