common: scope_exit: Implement mechanism for canceling a scope exit.

1 files changed, 8 insertions, 1 deletions

diff --git a/src/common/scope_exit.h b/src/common/scope_exit.h
index 1176a72b1..68ef5f197 100644
--- a/src/common/scope_exit.h
+++ b/src/common/scope_exit.h
@@ -12,10 +12,17 @@ template <typename Func>
 struct ScopeExitHelper {
     explicit ScopeExitHelper(Func&& func) : func(std::move(func)) {}
     ~ScopeExitHelper() {
-        func();
+        if (active) {
+            func();
+        }
+    }
+
+    void Cancel() {
+        active = false;
     }
 
     Func func;
+    bool active{true};
 };
 
 template <typename Func>