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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.
void g_trash_stack_push (GTrashStack **stack_p,gpointer data_p);
Pushes a piece of memory onto a GTrashStack.
gpointer
g_trash_stack_pop (GTrashStack **stack_p);
Pops a piece of memory off a GTrashStack.
gpointer
g_trash_stack_peek (GTrashStack **stack_p);
Returns the element at the top of a GTrashStack
which may be NULL.
guint
g_trash_stack_height (GTrashStack **stack_p);
Returns the height of a GTrashStack.
Note that execution of this function is of O(N) complexity where N denotes the number of items on the stack.
struct GTrashStack {
GTrashStack *next;
};
Each piece of memory that is pushed onto the stack is cast to a GTrashStack*.
GTrashStack * |
pointer to the previous element of the stack,
gets stored in the first |