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std::memcpy

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Null-terminierte Strings
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Null-terminated strings
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Classes
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basic_string
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Null-terminierte Byte-Strings
Funktionen
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Functions
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Character Manipulation
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Character manipulation
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Umwandlungen in numerische Formate
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Conversions to numeric formats
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String-Manipulation
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String manipulation
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strcpy
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strxfrm
String Prüfung
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String examination
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Speicher Manipulation
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Memory manipulation
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memchr
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memcpy
memmove
Verschiedenes
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Miscellaneous
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strerror
 
Defined in header <cstring>
void* memcpy( void* dest, const void* src, std::size_t count );

Copies count bytes from the object pointed to by src to the object pointed to by dest.

If the objects overlap, the behavior is undefined. If the objects are not trivially copyable (e.g. scalars, arrays, C-compatible structs), the behavior is undefined.

Inhaltsverzeichnis

[Bearbeiten] Parameter

dest -
Zeiger auf die Speicherstelle zu kopieren
Original:
pointer to the memory location to copy to
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src -
Zeiger auf die Speicherstelle von zu kopieren
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pointer to the memory location to copy from
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count -
Anzahl von Bytes zu kopieren
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number of bytes to copy
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[Bearbeiten] Rückgabewert

dest

[Bearbeiten] Beispiel

#include <iostream>
#include <cstring>
 
int main()
{
    char source[] = "once upon a midnight dreary...";
    char dest[4];
    std::memcpy(dest, source, sizeof dest);
    for (char c : dest) {
        std::cout << c << '\n';
    }
}

Output:

o
n
c
e

[Bearbeiten] Siehe auch

bewegt sich ein Puffer zu einem anderen
Original:
moves one buffer to another
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(Funktion) [edit]
Kopiert einen Bereich von Elementen, um eine neue Position
Original:
copies a range of elements to a new location
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(Funktions-Template) [edit]
Kopien einen Bereich von Elementen in rückwärts um
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copies a range of elements in backwards order
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(Funktions-Template) [edit]
checks if a type is trivially copyable
(Klassen-Template) [edit]
C documentation for memcpy