What is a void pointer?

A void pointer is a C convention for a raw address. The compiler has no idea what type of object a void Pointer really points to. If you write
int ip;
ip points to an int. If you write
void p;
p doesn’t point to a void!
In C and C++, any time you need a void pointer, you can use anotherpointer type. For example, if you have a char
, you can pass it to afunction that expects a void
. You don’t even need to cast it. In C (butnot in C++), you can use a void* any time you need any kind of pointer, without casting. (In C++, you need to cast it).
A void pointer is used for working with raw memory or for passing a pointer to an unspecified type.
Some C code operates on raw memory. When C was first invented, character pointers (char *) were used for that. Then people startedgetting confused about when a character pointer was a string, when it was a character array, and when it was raw memory.