mon: Replace deprecated use of format_to

The non-deprecated version takes an explicit OutputIterator.

Signed-off-by: Adam C. Emerson <aemerson@redhat.com>
(cherry picked from commit fff72cd14c58d06774cbd0274e6144b42448af03)

diff --git a/src/mon/LogMonitor.cc b/src/mon/LogMonitor.cc
index eb489e5dfc734d55b2b66ea55de5adf800bb5c7f..80e069d593af0f37132ac58eeaef07a77582b50f 100644 (file)
--- a/src/mon/LogMonitor.cc
+++ b/src/mon/LogMonitor.cc
@@ -415,7 +415,7 @@ void LogMonitor::log_external(const LogEntry& le)
     }
 
     if (fd >= 0) {
-      fmt::format_to(file_log_buffer, "{}\n", le);
+      fmt::format_to(std::back_inserter(file_log_buffer), "{}\n", le);
       int err = safe_write(fd, file_log_buffer.data(), file_log_buffer.size());
       file_log_buffer.clear();
       if (err < 0) {