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-rw-r--r--third_party/nix/src/libutil/finally.hh13
1 files changed, 13 insertions, 0 deletions
diff --git a/third_party/nix/src/libutil/finally.hh b/third_party/nix/src/libutil/finally.hh
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index 000000000000..2ead8661a6e7
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+++ b/third_party/nix/src/libutil/finally.hh
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <functional>
+
+/* A trivial class to run a function at the end of a scope. */
+class Finally {
+ private:
+  std::function<void()> fun;
+
+ public:
+  explicit Finally(std::function<void()> fun) : fun(fun) {}
+  ~Finally() { fun(); }
+};