What is the function of memcpy in C++?

The memcpy function is used to copy the contents of one memory location to another. Its function prototype is as follows:

void *memcpy(void *dest, const void *src, size_t n);

“Among them, dest is a pointer to the destination memory, src is a pointer to the source memory, and n is the number of bytes to be copied. The memcpy function copies the content of n bytes from the source memory to the destination memory.”

The main function of memcpy is to copy memory blocks. It can be used to copy various types of data, including basic types (such as int, float, char, etc.), structures, arrays, etc. By using memcpy, it is easy to copy the contents of one memory block to another without needing to copy each byte individually.

It is important to note that when using the memcpy function, it is necessary to ensure that there is no overlap between the source and destination memory. If there is overlap, using the memcpy function may result in undefined behavior. If overlapping situations need to be handled, the memmove function can be used as an alternative.