C / C++ / MFC

Richard Andrew x64 wrote:

I assumed

Richard MacCutchan wrote:

This forum is for serious questions, the Lounge is the place for quizzes.

Chris Maunder wrote:

Please do not post links to your question in one forum from another, unrelated forum (such as the lounge). It will be deleted.

Richard MacCutchan wrote:

the Lounge is the place for quizzes.

Brandon-X12000 wrote:

I deem this is technically appropriate

Brandon-X12000 wrote:

Trying to guide him in the wrong path

int i = 42;
int* pint = 0;
int** ppint = 0;
ppint += &i;
pint = *ppint;

Matthew Faithfull wrote:

ppint += &i;

int i = 42;
int** ppint = &i;
int* pint = *ppint;

int* pi = ...;
int** ppi = ...;
*pi; *ppi; // These two are both valid C++ and we know what this means
**ppi; // This is also valid, but the following:
**pi; // Is not valid, and it is not clear what it's suppose to mean; *pi gives an integer value, so what is the dereference of an integer?

int i = someIntValue();
int *pint = 0;
pint += i;

int* f1(int i) { return 0; }
int* f2(int* pi) { return pi; }
union UPointers {
   int*(*ag1[2])(int i);
   struct SPointers {
      int*(*g1)(int i);
      int*(*g2)(int* pi);
   } my_spointers;
} my_pointers;
int* foo(int i) {
   int* (*h1)(int i);
   my_pointers.my_spointers.g1 = &f1;
   my_pointers.my_spointers.g2 = &f2;
   h1 = my_pointers.ag1[1];
   return h1(i);
}
int _tmain(int argc, _TCHAR* argv[])
{
   for (int i = 12; i < 15; ++i) {
      int* pi = foo(i);
      std::cout << i << ' ' << pi << std::endl;
   }
   return 0;
}

12 0000000C
13 0000000D
14 0000000E

int* withoutCasts(int i)
{
  union {int j; int* pint;} converter;
  converter.j = i;
  return converter.pint;
}

class base {
public:
   virtual ~base() {}
   virtual int* foo(int i) { return &i; }
};
class derived : public base {
public:
   virtual ~derived() {}
   virtual int foo(int i) { return i; } // overrides base::foo()
};
int* bar(int i) {
   base* caster = new derived; // implicit downcast here
   int* pi = caster->foo(i); // this is the actual 'reinterpret cast'
   delete caster;
   return pi:
}