From 67cdcc2e12118becb823e20a40cc2687f2b8425a Mon Sep 17 00:00:00 2001
From: Adam Carpenter <53hornet@gmail.com>
Date: Wed, 27 Mar 2019 15:32:37 -0400
Subject: Started Rust in Action MEAP.

---
 meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs

(limited to 'meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs')

diff --git a/meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs b/meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs
new file mode 100644
index 0000000..3bf14c6
--- /dev/null
+++ b/meap/meap-code/ch6/ch6-heap-vs-stack/src/main.rs
@@ -0,0 +1,16 @@
+use std::mem::drop; // <1> Bring manual `drop()` into local scope
+
+fn main() {
+    let a = Box::new(1);
+    let b = Box::new(1);
+    let c = Box::new(1);
+
+    let result1 = *a + *b + *c; // <2> Use the variables so that they're not optimized away by the compiler. The unary `pass:[*]` operator is called the dereference operator. It returns the value within the box.
+
+    drop(a); // <3> The memory holding `a` is now available
+
+    let d = Box::new(1);
+    let result2 = *b + *c + *d;
+
+    println!("{} {}", result1, result2);
+}
-- 
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