std::memcpy

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.

Parameters

dest	-	pointer to the memory location to copy to
src	-	pointer to the memory location to copy from
count	-	number of bytes to copy

Return value

dest

Example

Run this code

#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

See also

Template:cpp/string/byte/dcl list memmoveTemplate:cpp/algorithm/dcl list copyTemplate:cpp/algorithm/dcl list copy backward

is_trivially_copyable (C++11)	checks if a type is trivially copyable (class template)
C documentation for memcpy