[#BloombergLP-bsls-Log-platformDefaultMessageHandler]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::xref:BloombergLP/bsls/Log.adoc[Log]::platformDefaultMessageHandler
:relfileprefix: ../../../
:mrdocs:

Write a formatted log record to a platform‐specific destination.

== Synopsis

Declared in `<bsls_log.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
platformDefaultMessageHandler(
    xref:BloombergLP/bsls/LogSeverity/Enum.adoc[bsls::LogSeverity::Enum] severity,
    char const* file,
    int line,
    char const* message);
----

== Description

Write, to a platform‐specific destination, a string composed of the specified `severity`, `file` name, `line` number, and `message`. On _non_‐Windows systems, write the log record to the `stderr` output stream. On _Windows_ systems: If the current process is running in _console_ _mode_, write the log record to the `stderr` output stream. If the current process is running in _non‐console_ _mode_, write the log record to the Windows process debugger. The behavior is undefined unless `0 <= line`. Note that this function is used as the default log message handler. Also note that this function will write the message irrespective of the current `severityThreshold`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *severity*
| severity of the log record
| *file*
| source file name associated with the record
| *line*
| source line number associated with the record
| *message*
| log message text
|===


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