Check to see if a data structure of a given type exists.


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.

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