mongoc_apm_topology_changed_get_previous_description

const mongoc_topology_description_t *
mongoc_apm_topology_changed_get_previous_description (
   const mongoc_apm_topology_changed_t *event);

Returns this event's previous description. The data is only valid in the scope of the callback that receives this event; copy it if it will be accessed after the callback returns.

• event: A mongoc_apm_topology_changed_t <>.

A mongoc_topology_description_t <> that should not be modified or freed.

See also:

Introduction to Application Performance Monitoring <>

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