C / C++ / MFC

gamefreak2291 wrote:

I never did get an answer to my initial question

Member 476468 wrote:

Windows SDK will not load with Visual Studio 2008

Member 476468 wrote:

Does anyone know how to solve this?

ForNow wrote:

I would assume the "this" pointer gets initialized after excuting the first contructer

#include <iostream>

class A
{
public:
   A(int x) { x_ = x; }
   int x_;
};

class B
{
public:
   B(A* a) { std::cout << a->x_ << std::endl; }
};

class C : public A, public B
{
public:
	C(int y) : A(y), B(static_cast<A*>(this)) {}
};

int main(int, char**)
{
   C c(33);
}

ForNow wrote:

from my undertanding static_cast<a*> is just a cast

+---------------+
|   A members   |
+---------------+
|   B members   |
+---------------+
|   C members   |
+---------------+

Joe Woodbury wrote:

The "this" pointer should rarely be used in an initializer list.

Joe Woodbury wrote:

...the virtual table hasn't been set up at this point.

Joe Woodbury wrote:

I also think your class is a mistake and misunderstands CSyncObject() and CSingleLock(). The point is that there is one synchronization object with multiple threads locking that object. That locking is done by instantiated CSingleLock() at the start of a scope and upon exit of that scope, CSingleLock will be destructed regardless regardless of how the scope was exited.

struct mylock_pbase
{
   mylock_pbase() : syncObject(NULL) {}
   CSyncObject syncObject;
};

class mylock : private mylock_pbase, public CSingleLock
{
public:
   mylock(BOOL bInitialLock) : mylock_pbase(),
                               CSingleLock(&syncObject, bInitialLock)
   {
   }
   BOOL Unlock();
};