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std::memcpy

Da cppreference.com
< cpp‎ | string‎ | byte

 
 
Biblioteca cordas
Strings terminadas
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Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
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Classes
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basic_string
char_traits
 
Cordas de terminação nula de bytes
Funções
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Functions
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Manipulação personagem
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Character manipulation
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Conversões para formatos numéricos
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Conversions to numeric formats
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Manipulação de cadeia
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Exame String
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String examination
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Manipulação de memória
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Diversos
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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.

Índice

[editar] Parâmetros

dest -
ponteiro para o local de memória para copiar
Original:
pointer to the memory location to copy to
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src -
ponteiro para o local de memória para copiar
Original:
pointer to the memory location to copy from
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count -
número de bytes a serem copiados
Original:
number of bytes to copy
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[editar] Valor de retorno

dest

[editar] Exemplo

#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

[editar] Veja também

move-se um tampão para o outro
Original:
moves one buffer to another
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(função) [edit]
Copia um intervalo de elementos para um novo local
Original:
copies a range of elements to a new location
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(modelo de função) [edit]
cópias. uma série de elementos a fim de trás
Original:
copies a range of elements in backwards order
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(modelo de função) [edit]
checks if a type is trivially copyable
(modelo de classe) [edit]
C documentation for memcpy