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void

When used as a function return type, the void keyword specifies that the function does not return a value. When used for a function's parameter list, void specifies that the function takes no parameters. When used in the declaration of a pointer, void specifies that the pointer is "universal."

void declarator ;

If a pointer's type is void *, the pointer can point to any variable that is not declared with the const or volatile keyword. A void pointer cannot be dereferenced unless it is cast to another type. A void pointer can be converted into any other type of data pointer.

A void pointer can point to a function, but not to a class member in C++.

You cannot declare a variable of type void.

Example

// void.cpp
// Examples of the void keyword
void vobject;             // C2182 Error
void *pv;                 // Okay
int  *pint; int i;
int main()               // main has no return value
{
   pv = &i;
  // Cast optional in C required in C++
   pint = (int *)pv;
} 

See Also

C++ Keywords | Pointers to Type void | Fundamental Types

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