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-rw-r--r--absl/base/optimization.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/absl/base/optimization.h b/absl/base/optimization.h
index f9859958..3aa66e1c 100644
--- a/absl/base/optimization.h
+++ b/absl/base/optimization.h
@@ -18,12 +18,23 @@
// -----------------------------------------------------------------------------
//
// This header file defines portable macros for performance optimization.
+//
+// This header is included in both C++ code and legacy C code and thus must
+// remain compatible with both C and C++. C compatibility will be removed if
+// the legacy code is removed or converted to C++. Do not include this header in
+// new code that requires C compatibility or assume C compatibility will remain
+// indefinitely.
#ifndef ABSL_BASE_OPTIMIZATION_H_
#define ABSL_BASE_OPTIMIZATION_H_
#include <assert.h>
+#ifdef __cplusplus
+// Included for std::unreachable()
+#include <utility>
+#endif // __cplusplus
+
#include "absl/base/config.h"
#include "absl/base/options.h"