From d98586504882e28cd587779573fccf3317726b65 Mon Sep 17 00:00:00 2001
From: Frank Mayer <gh@frankmayer.dev>
Date: Fri, 1 Nov 2024 22:21:50 +0100
Subject: [PATCH] defer :)

---
 src/defer.h  | 21 +++++++++++++++++++++
 src/main.cpp | 11 ++++++++++-
 2 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 src/defer.h

diff --git a/src/defer.h b/src/defer.h
new file mode 100644
index 0000000..b7dc7af
--- /dev/null
+++ b/src/defer.h
@@ -0,0 +1,21 @@
+#ifndef DEFER_H
+#define DEFER_H
+
+#include <functional>
+#include <iostream>
+
+class Defer {
+public:
+  Defer(std::function<void()> func) : func_(func) {}
+  ~Defer() { func_(); }
+
+private:
+  std::function<void()> func_;
+};
+
+#define CONCAT_IMPL(a, b) a##b
+#define CONCAT(a, b) CONCAT_IMPL(a, b)
+
+#define DEFER(code) Defer CONCAT(defer__, __LINE__)([&]() { code; });
+
+#endif // DEFER_H
diff --git a/src/main.cpp b/src/main.cpp
index 0ab7f9b..2e0c183 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,15 @@
+#include "defer.h"
 #include <iostream>
 
+struct Meep {
+  std::string foo = "Meep!";
+};
+
 int main() {
-  std::cout << "Hello, World!" << std::endl;
+  Meep *meep = new Meep();
+  DEFER(delete meep);
+
+  DEFER(std::cout << "Goodbye, " << meep->foo << std::endl);
+  std::cout << "Hello, " << meep->foo << std::endl;
   return 0;
 }