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std::memcpy

De cppreference.com
< cpp‎ | string‎ | byte

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
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Classes
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basic_string
char_traits
 
Chaînes d'octets à zéro terminal
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
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Conversions to numeric formats
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La manipulation de chaînes
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Examen chaîne
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String examination
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Manipulation de la mémoire
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Divers
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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.

Sommaire

[modifier] Paramètres

dest -
pointeur à l'emplacement mémoire de la copie
Original:
pointer to the memory location to copy to
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src -
pointeur à l'emplacement de la mémoire à copier
Original:
pointer to the memory location to copy from
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count -
nombre d'octets à copier
Original:
number of bytes to copy
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[modifier] Retourne la valeur

dest

[modifier] Exemple

#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';
    }
}

Résultat :

o
n
c
e

[modifier] Voir aussi

une mémoire tampon se déplace vers un autre
Original:
moves one buffer to another
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(fonction) [edit]

(C++11)
Copie une série d'éléments vers un nouvel emplacement
Original:
copies a range of elements to a new location
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(fonction générique) [edit]
copie une plage d'éléments dans l'ordre inverse
Original:
copies a range of elements in backwards order
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(fonction générique) [edit]
checks if a type is trivially copyable
(classe générique) [edit]
C documentation for memcpy