Dynamically allocating memory for array of pointers.

[borgrulze]

Can anyone inform me as to how to dynamically allocate memory for a pointer to an array of objects using new.

The size of the array of objects is only known at run time.

 

[MKuiper]

assuming your object is called SomeObject:

// declare a pointer to SomeObject
SomeObject *pSomeObject;

// Find out the number of objects required
DWORD NumberOfObjects = ....;

// Allocate memory for the required number of pointers
pSomeObject = (SomeObject *)( malloc ( NumberOfObjects * sizeof ( SomeObject *)));

// create the objects
DWORD i1;
for ( i1 = 0; i1 < NumberOfObjects; i1++ )
{ pSomeObject + i1 = new SomeObject ( .... ); }

// do something with someobject[5]

(*(pSomeObject + 5)).MemberOfSomeObject ( );

// destruct the objects

for ( i1 = 0; i1 < NumberOfObjects; i1++ )
{ delete ( pSomeObject + i1 ); }

// free the memory
free ( pSomeObject );

 

[jtm111]

to use new and delete exclusively (not malloc/free):

// declare a pointer to SomeObject
SomeObject *pSomeObject;

// Find out the number of objects required
DWORD NumberOfObjects = ....;

// Allocate memory for the required number of pointers
pSomeObject = new SomeObject *[NumberOfObjects];

// create the objects

DWORD i1;
for ( i1 = 0; i1 < NumberOfObjects; i1++ )
pSomeObject[i1] = new SomeObject;

pSomeObject[5]->method();

for ( i1 = 0; i1 < NumberOfObjects; i1++ )
delete pSomeObject[i1];

delete [] pSomeObject;