logging: make XLOG_GET_CATEGORY() safe for all callers

[folly.git] / folly / MPMCPipeline.h

diff --git a/folly/MPMCPipeline.h b/folly/MPMCPipeline.h
index 4fef5ead5ad82a2601b04b0a6db8faf09333b493..eca0b29b7fda3bc27b0ef97dab48e00e9345962d 100644 (file)
--- a/folly/MPMCPipeline.h
+++ b/folly/MPMCPipeline.h
@@ -275,8 +275,9 @@ template <class In, class... Stages> class MPMCPipeline {
    * in any queue) are also counted.
    */
   ssize_t sizeGuess() const noexcept {
-    return (std::get<0>(stages_).writeCount() * kAmplification -
-            std::get<sizeof...(Stages)>(stages_).readCount());
+    return ssize_t(
+        std::get<0>(stages_).writeCount() * kAmplification -
+        std::get<sizeof...(Stages)>(stages_).readCount());
   }
 
  private: