Fix build failure with -std=c++17 option (apache#2844)

chenBright · Dec 12, 2024 · 282bc90 · 282bc90
1 parent 1a02745
commit 282bc90
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/butil/containers/optional.h b/src/butil/containers/optional.h
@@ -27,6 +27,9 @@
 // After C++17, `optional` is an alias for `std::optional`.
 
 #if __cplusplus >= 201703L
+
+#include <optional>
+
 namespace butil {
 using std::in_place_t;
 using std::in_place;