[#XLOGF_IF]
= XLOGF_IF
:mrdocs:

Log a message using a format string if and only if the specified condition predicate evaluates to true. Note that the condition is _only_ evaluated if the log‐level check passes.

== Synopsis

Declared in `<folly/logging/xlog.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define XLOGF_IF(level, cond, fmt, ...)

----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *level*
| The `folly::LogLevel` value at which to log.
| *cond*
| A predicate; the message is logged only when it is true.
| *fmt*
| A `folly::format`‐style format string for the message.
|===


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