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-rw-r--r--absl/base/log_severity.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/absl/base/log_severity.h b/absl/base/log_severity.h
index b19a7ffab820..5a1d5576ce7b 100644
--- a/absl/base/log_severity.h
+++ b/absl/base/log_severity.h
@@ -16,6 +16,7 @@
 #define ABSL_BASE_INTERNAL_LOG_SEVERITY_H_
 
 #include <array>
+#include <ostream>
 
 #include "absl/base/attributes.h"
 
@@ -61,6 +62,10 @@ constexpr absl::LogSeverity NormalizeLogSeverity(int s) {
   return NormalizeLogSeverity(static_cast<absl::LogSeverity>(s));
 }
 
+// The exact representation of a streamed `absl::LogSeverity` is deliberately
+// unspecified; do not rely on it.
+std::ostream& operator<<(std::ostream& os, absl::LogSeverity s);
+
 }  // namespace absl
 
 #endif  // ABSL_BASE_INTERNAL_LOG_SEVERITY_H_