ds_exists(ind, type);
| Argument | Description |
|---|---|
| ind | The variable index to check for the data structure |
| type | The type of data structure to check for (see the list of constants below) |
Returns: Boolean
With this function you can check to see if a data structure of
the given type exists. You supply the "index" value (as held in a
variable) and the ds "type", which can be any of the constants
listed below, and the function will return true if the
data structure exists and false otherwise.
| Constant | Description |
|---|---|
| ds_type_map | A map data structure |
| ds_type_list | A list data structure |
| ds_type_stack | A stack data structure |
| ds_type_grid | A grid data structure |
| ds_type_queue | A queue data structure |
| ds_type_priority | A priority data structure |
if !ds_exists(ai_grid, ds_type_grid)
{
ai_grid = ds_grid_create(room_width / 32,
room_height / 32);
}
The above code checks the (previously initialised) variable "ai_grid" to see if it indexes a ds_grid type data structure, and if it does not then it creates one and stores its index in the variable.