std::vector::front
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| reference front(); |
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| const_reference front() const; |
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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.The text has been machine-translated via Google Translate.
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Inhaltsverzeichnis |
[Bearbeiten] Parameter
(None)
Original:
(none)
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[Bearbeiten] Rückgabewert
Verweisen auf das erste Element
Original:
reference to the first element
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[Bearbeiten] Komplexität
Constant
Original:
Constant
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[Bearbeiten] 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().The text has been machine-translated via Google Translate.
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[Bearbeiten] Beispiel
Der folgende Code verwendet
front um das erste Element einer std::vector<char> anzuzeigen:
Original:
The following code uses
front to display the first element of a std::vector<char>:
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#include <vector> #include <iostream> int main() { std::vector<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
| Zugriff auf das letzte Element (öffentliche Elementfunktion) | |
