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.TH "MONGOC_TOPOLOGY_DESCRIPTION_HAS_WRITABLE_SERVER" "3" "Jun 04, 2021" "1.17.6" "libmongoc"
.SH NAME
mongoc_topology_description_has_writable_server \- mongoc_topology_description_has_writable_server()
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.SH SYNOPSIS
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.ft C
bool
mongoc_topology_description_has_writable_server (
   mongoc_topology_description_t *td);
.ft P
.fi
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.sp
Determines if the topology has a writable server available, such as a primary, mongos, or standalone. This function uses the driver\(aqs current knowledge of the state of the MongoDB server or servers it is connected to; it does no I/O and it does not block.
.sp
Use this function in a topology\-changed callback registered with \fBmongoc_apm_set_topology_changed_cb\fP\&. For historical reasons, the \fBmongoc_topology_description_t\fP passed to the callback is a const pointer, you must cast away const to pass the pointer to \fBmongoc_topology_description_has_writable_server\fP\&.
.SH PARAMETERS
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.IP \(bu 2
\fBtd\fP: A \fBmongoc_topology_description_t\fP\&.
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.SH RETURNS
.sp
True if there is a known writable server.
.SH SEE ALSO
.sp
Introduction to Application Performance Monitoring
.SH AUTHOR
MongoDB, Inc
.SH COPYRIGHT
2017-present, MongoDB, Inc
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