treedb_set_callback()

`treedb_set_callback()`#

Sets a callback function for treedb_name in tranger. The callback is triggered on node operations such as creation, update, or deletion.

C

Prototype

int treedb_set_callback(
    json_t            *tranger,
    const char        *treedb_name,
    treedb_callback_t  treedb_callback,
    void              *user_data
);

Parameters

Key	Type	Description
`tranger`	`json_t *`	Pointer to the `tranger` instance managing the tree database.
`treedb_name`	`const char *`	Name of the tree database where the callback will be set.
`treedb_callback`	`treedb_callback_t`	Function pointer to the callback that will be invoked on node operations.
`user_data`	`void *`	User-defined data that will be passed to the callback function.

Return Value

Returns 0 on success, or a negative error code on failure.

Notes

The callback function must follow the treedb_callback_t signature and will receive parameters such as tranger, treedb_name, topic_name, operation, and node. The callback is triggered on events like EV_TREEDB_NODE_CREATED, EV_TREEDB_NODE_UPDATED, and EV_TREEDB_NODE_DELETED.

JS

Prototype

// Not applicable in JS

Python

Prototype

# Not applicable in Python

treedb_set_callback()

treedb_set_callback()#

`treedb_set_callback()`#