From 5eec09334bd17ebb28a57021b56a6e687f433528 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@gmail.com>
Date: Sun, 22 Oct 2017 17:22:05 +0200
Subject: feat: Add Drop-based defer implementation

---
 examples/defer.rs | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 examples/defer.rs

(limited to 'examples/defer.rs')

diff --git a/examples/defer.rs b/examples/defer.rs
new file mode 100644
index 000000000000..eadac795f8bc
--- /dev/null
+++ b/examples/defer.rs
@@ -0,0 +1,31 @@
+// Go's defer in Rust!
+
+struct Defer<F: Fn()> {
+    f: F
+}
+
+impl <F: Fn()> Drop for Defer<F> {
+    fn drop(&mut self) {
+        (self.f)()
+    }
+}
+
+// Only added this for Go-syntax familiarity ;-)
+fn  defer<F: Fn()>(f: F) -> Defer<F> {
+    Defer { f }
+}
+
+fn main() {
+    let mut i = 1;
+
+    // Calling it "token" ... could be something else. The lifetime of this
+    // controls when the action is run.
+    let _token = defer(move || println!("Value is: {}", i));
+
+    i += 1;
+    println!("Value is: {}", i);
+}
+
+// Prints:
+// Value is: 2
+// Value is: 1
-- 
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