.\" Man page generated from reStructuredText.
.
.TH "MONGOC_TOPOLOGY_DESCRIPTION_HAS_READABLE_SERVER" "3" "Jun 04, 2021" "1.17.6" "libmongoc"
.SH NAME
mongoc_topology_description_has_readable_server \- mongoc_topology_description_has_readable_server()
.
.nr rst2man-indent-level 0
.
.de1 rstReportMargin
\\$1 \\n[an-margin]
level \\n[rst2man-indent-level]
level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
-
\\n[rst2man-indent0]
\\n[rst2man-indent1]
\\n[rst2man-indent2]
..
.de1 INDENT
.\" .rstReportMargin pre:
. RS \\$1
. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
. nr rst2man-indent-level +1
.\" .rstReportMargin post:
..
.de UNINDENT
. RE
.\" indent \\n[an-margin]
.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
.nr rst2man-indent-level -1
.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
..
.SH SYNOPSIS
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
bool
mongoc_topology_description_has_readable_server (
   mongoc_topology_description_t *td, const mongoc_read_prefs_t *prefs);
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Determines if the topology has a readable server available.
Servers are filtered by the given read preferences only if the driver is connected to a replica set, otherwise the read preferences are ignored.
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_readable_server\fP\&.
.SH PARAMETERS
.INDENT 0.0
.IP \(bu 2
\fBtd\fP: A \fBmongoc_topology_description_t\fP\&.
.IP \(bu 2
\fBread_prefs\fP: A \fBmongoc_read_prefs_t\fP or \fBNULL\fP for default read preferences.
.UNINDENT
.SH RETURNS
.sp
True if there is a known server matching \fBprefs\fP\&.
.SH SEE ALSO
.sp
Introduction to Application Performance Monitoring
.SH AUTHOR
MongoDB, Inc
.SH COPYRIGHT
2017-present, MongoDB, Inc
.\" Generated by docutils manpage writer.
.