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src/base/defer.hpp

@@ -0,0 +1,21 @@
+#define DEFER_HEADER
+template <typename T>
+struct DEFER_ExitScope {
+    T lambda;
+    DEFER_ExitScope(T lambda) : lambda(lambda) {}
+    ~DEFER_ExitScope() { lambda(); }
+    DEFER_ExitScope(const DEFER_ExitScope &i) : lambda(i.lambda){};
+
+  private:
+    DEFER_ExitScope &operator=(const DEFER_ExitScope &);
+};
+
+class DEFER_ExitScopeHelp {
+  public:
+    template <typename T>
+    DEFER_ExitScope<T> operator+(T t) { return t; }
+};
+
+#define DEFER_CONCAT_INTERNAL(x, y) x##y
+#define DEFER_CONCAT(x, y) DEFER_CONCAT_INTERNAL(x, y)
+#define Defer const auto DEFER_CONCAT(defer__, __LINE__) = DEFER_ExitScopeHelp() + [&]()