I can't understand a difine function in preprocessor and how using it.

Question

I know that follow names are symbols:
_declspec and dllexport

then what does foo() function do?

==================================
#define VB_EXPORT _declspec(dllexport)

//.... code lines .... //

VB_EXPORT int *foo (void) ;

class A {
public:
A( )
{ ptr = foo() ;}

private:
void *ptr;

} ;

void * foo (void) {
return NULL;

}

Answer 1

it's complicated for me but I try for it. thanks body.