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memcpy() Function in C++ Programming Language
memcpy() Function in C++
Copy block of memory. Copies the values of num bytes from the location pointed to by source directly to the memory block pointed to by destination. The underlying type of the objects pointed to by both the source and destination pointers are irrelevant for this function; The result is a binary copy of the data.
The function does not check for any terminating null character in source - it always copies exactly num bytes.
To avoid overflows, the size of the arrays pointed to by both the destination and source parameters, shall be at least num bytes, and should not overlap (for overlapping memory blocks, memmove is a safer approach).
Syntax for memcpy() Function in C++
#include <cstring>
void * memcpy ( void * destination, const void * source, size_t num );
destination
Pointer to the destination array where the content is to be copied, type-casted to a pointer of type void*.
source
Pointer to the source of data to be copied, type-casted to a pointer of type const void*.
num
Number of bytes to copy. size_t is an unsigned integral type.
destination is returned.
• Whenever there is a need to copy a block of memory from one location to another location in C++, we make use of a function called memcpy() function.
• The memory location whose contents are to be copied to another memory location acts as a source and the memory location to which the contents are going to be copied acts as a destination.
• Both the source memory location and destination memory location are pointed by the pointers.
• The cstring.h header file must be included in the C++ program to be able to make use of memcpy() function to copy the contents of the source memory location to the destination memory location.
• The memcpy() function takes three parameters namely source, destination, and a number of bytes where source is the source of the memory location from where the contents is to be copied, the destination is the memory location to which the contents are to be copied.
• The number of bytes to be copied from the source memory location to the destination memory location is specified as a parameter to the memcpy function along with source and destination memory locations.
• The contents of the source memory location overlap the contents of the destination memory location after copying is done using memcpy() function.
/* Whenever there is a need to copy a block of memory from one location to another location in C++, we make use of a function called memcpy() function where one memory location acts as a source whose contents are to be copied to another memory location that acts as a destination and both the source memory location and destination memory location are pointed by the pointers and cstring.h header file must be included in the C++ program to be able to make use of memcpy() function and the number of bytes to be copied from source memory location to the destination memory location is specified as a parameter to the memcpy function along with source and destination memory locations. */
/* Copy block of memory by memcpy() function code example */
#include <cstring>
#include <iostream>
using namespace std;
int main() {
char source[] = "Happy 8)";
char destination[] = "Codings";
cout << "Initial destination: " << destination << endl;
// copy all bytes of destination to source
memcpy(destination, source, sizeof(source));
cout << "Final destination: " << destination;
return 0;
}
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