how to creater pointer to update a dynamic STL vector in C++?

[usustarr]

I have a dynamic array which will be updated from a different test system. I am havign hard time with syntax. Can someone please help me here?

Here is where I declare my vector

void TestSystem::Drive(U32 RunMode, U32 Options)
{ //U32 is unsigned 32 bit

  U32 condition;
  U32 i;
  U8 k;
  vector<U32> badDriveList(1,0);//initial size of vector is 1 and value is 0
  int *badDrivePointer[&badDriveList];

  bool driveStatus = testSystems[k]->DriveCheck(badDrivePointer);//should this be &badDrivePointer? 
// left side to "->" is correct. After that i am not sure  
}

Here is where I update my vector.

int TestSystem::DriveCheck(int *badDriveList)
{
  U32 condition;
  U32 i= 10;
  U32 j = 0;

  for(j;j<i;j++)
  {
  badDriveList[j] = (*i)->shelf;//right hand side of this is working when tested with complete code base 
  //I am not sure how to write values in to badDriveList vector using pointers
  }
}

here is part of my .h file

int recoverDriveCheck(int *);

Please help me out to get this thing right.

[Fbody]

First, your declaration of badDrivePointer should probably be a pointer to a U32 object since that is what the vector is carrying, not ints. Additionally, according to your comments, a U32 is an unsigned type whereas an int is a signed type. Unless U32 is an inaccurately-named typedef for int, this would generally produce a compiler error about incompatible pointer types.

Second, if you want the address of a vector element, you need to select the element, then get the reference to the returned object U32 badDrivePointer = &(badDriveList[listIndex]);

[arkoenig]

You define badDriveList in one function and expect to be able to use it in another. That won't work, period. As you've written your code, badDriveList is a local variable in TestSystem::Drive, and will be destroyed as soon as TestSystem::Drive exits.

What you probably need to do is to make badDriveList a data member of TestSystem. Until you do that, or something like it, there's little point in talking about other problems.

[Fbody]

You define badDriveList in one function and expect to be able to use it in another. That won't work, period. As you've written your code, badDriveList is a local variable in TestSystem::Drive, and will be destroyed as soon as TestSystem::Drive exits.

What you probably need to do is to make badDriveList a data member of TestSystem. Until you do that, or something like it, there's little point in talking about other problems.

I think you are correct that there are some logic and intent errors, and I agree that badDriveList would be better as a member of TestSystem instead of local to Drive. However,

void TestSystem::Drive(U32 RunMode, U32 Options)
{ //U32 is unsigned 32 bit
 
  U32 condition;
  U32 i;
  U8 k;
  vector<U32> badDriveList(1,0);//initial size of vector is 1 and value is 0
  int *badDrivePointer[&badDriveList];
 
  bool driveStatus = testSystems[k]->DriveCheck(badDrivePointer);//should this be &badDrivePointer? 
// left side to "->" is correct. After that i am not sure  
}

if you read the code properly, and ignore the syntax errors, you can see that they call DriveCheck from Drive. Since they are (attempting) sending a pointer to DriveCheck it should be fine because badDriveList isn't destroyed until Drive ends, which it hasn't. It's no different than creating an object in main() and sending a pointer to it to a sub-function; both functions just happen to be members of TestSystem.

[arkoenig]

That's true if the only place DriveCheck is called is from Drive--but we don't know that for sure.

[usustarr]

That's true if the only place DriveCheck is called is from Drive--but we don't know that for sure.

First of all, I really appreciate help here form both of you.

I do see why it would be nice to be able to call driveCheck from out side of drive. But as of right now, I dont think I will need to call driveCheck from any where else other than while I am in drive.