Silence a signedness-comparison warning in gmock-actions_test.
include <functional> when using std::function in gmock.
diff --git a/include/gmock/gmock-generated-function-mockers.h b/include/gmock/gmock-generated-function-mockers.h
index ce7341d..b98b471 100644
--- a/include/gmock/gmock-generated-function-mockers.h
+++ b/include/gmock/gmock-generated-function-mockers.h
@@ -43,6 +43,10 @@
#include "gmock/gmock-spec-builders.h"
#include "gmock/internal/gmock-internal-utils.h"
+#if GTEST_HAS_STD_FUNCTION_
+# include <functional>
+#endif
+
namespace testing {
namespace internal {