Trash Stacks maintain a stack of unused allocated memory chunks. A #GTrashStack is an efficient way to keep a stack of unused allocated memory chunks. Each memory chunk is required to be large enough to hold a #gpointer. This allows the stack to be maintained without any space overhead, since the stack pointers can be stored inside the memory chunks. There is no function to create a #GTrashStack. A %NULL #GTrashStack* is a perfectly valid empty stack. Each piece of memory that is pushed onto the stack is cast to a GTrashStack*. @next: pointer to the previous element of the stack, gets stored in the first sizeof (gpointer) bytes of the element. Pushes a piece of memory onto a #GTrashStack. @stack_p: a pointer to a #GTrashStack. @data_p: the piece of memory to push on the stack. Pops a piece of memory off a #GTrashStack. @stack_p: a pointer to a #GTrashStack. @Returns: the element at the top of the stack. Returns the element at the top of a #GTrashStack. @stack_p: a pointer to a #GTrashStack. @Returns: the element at the top of the stack. Returns the height of a #GTrashStack. @stack_p: a pointer to a #GTrashStack. @Returns: the height of the stack.