[#XLOGF_FIRST_N]
= XLOGF_FIRST_N
:mrdocs:

Similar to XLOGF(...) except only log a message the first n times, exactly.

== Synopsis

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

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

----

== Description

The internal counter is process‐global and threadsafe and exchanges are atomic.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *level*
| The `folly::LogLevel` value at which to log.
| *n*
| The number of initial invocations to log.
| *fmt*
| A `folly::format`‐style format string for the message.
|===


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