Dynamically allocated structure and casting.
- by Simone Margaritelli
Let's say I have a first structure like this:
typedef struct {
int ivalue;
char cvalue;
}
Foo;
And a second one:
typedef struct {
int ivalue;
char cvalue;
unsigned char some_data_block[0xFF];
}
Bar;
Now let's say I do the following:
Foo *pfoo;
Bar *pbar;
pbar = new Bar;
pfoo = (Foo *)pbar;
delete pfoo;
Now, when I call the delete operator, how much memory does it free?
sizeof(int) + sizeof(char)
Or
sizeof(int) + sizeof(char) + sizeof(char) * 0xFF
?
And if it's the first case due to the casting, is there any way to prevent this memory leak from happening?
Note: please don't answer "use C++ polymorphism" or similar, I am using this method for a reason.
