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ACMOJ-1048.hpp

@@ -0,0 +1,13 @@
+#include <functional>
+#include <stack>
+class Defer {
+  std::stack<std::function<void()>> stk;
+
+ public:
+  ~Defer() {
+    while (!stk.empty()) stk.top()(), stk.pop();
+  }
+  Defer() = default;
+  Defer(std::function<void()> f) { stk.push(f); }
+  void operator()(std::function<void()> f) { stk.push(f); }
+};