The callback API provides a way for a Network
structure to signal precisely when a particular change (e.g., an edge toggle) is about to take place. It is intended to simplify and robustify the management of u_
functions from the Terms API.
void OnNetworkEdgeChange(Vertex, Vertex, void *, Network *)
and void OnWtNetworkEdgeChange(Vertex, Vertex, double, void *, Network *)
, a callback function, compatible with u_
functions and Mu_
functions both (since a void*
can be any pointer).
Network
and WtNetwork
OnNetworkEdgeChange **on_edge_change
and OnWtNetworkEdgeChange **on_edge_change
: an array of pointers to callback functions.
void **on_edge_change_payload
: an array of void
pointers that get passed as the third argument to the corresponding on_edge_change
function.
unsigned int n_on_edge_change
: number of callbacks in the above two arrays.
unsigned int max_on_edge_change
: the amount of space allocated for the above two arrays.
void AddOnNetworkEdgeChange(Network *nwp, OnNetworkEdgeChange u_func, void *payload, unsigned int pos)
and void AddOnWtNetworkEdgeChange(WtNetwork *nwp, OnWtNetworkEdgeChange u_func, void *payload, unsigned int pos)
: Set a callback u_func
to be called with argument payload
whenever an edge in nwp
is changed. Its position in the list (i.e., the order in which it is called) is set to be pos
(with large pos
truncated to indicate the last position).
void DeleteOnNetworkEdgeChange(Network *nwp, OnNetworkEdgeChange u_func, void *payload)
and void DeleteOnWtNetworkEdgeChange(WtNetwork *nwp, OnWTNetworkEdgeChange u_func, void *payload)
: Search the list of nwp
's callbacks for u_func
and payload
and delete the callback when it is found. (If it is not found, an immediate error is raised.)
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