Loading data on the heap using box

3 files changed, 41 insertions, 0 deletions

diff --git a/smart_pointer/.gitignore b/smart_pointer/.gitignore
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--- /dev/null
+++ b/smart_pointer/.gitignore
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+
+# Created by https://www.toptal.com/developers/gitignore/api/rust
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# End of https://www.toptal.com/developers/gitignore/api/rust
+
diff --git a/smart_pointer/Cargo.toml b/smart_pointer/Cargo.toml
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+++ b/smart_pointer/Cargo.toml
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+[package]
+name = "smart_pointer"
+version = "0.1.0"
+authors = ["Jordan Gong <jordan.gong@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/smart_pointer/src/main.rs b/smart_pointer/src/main.rs
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+++ b/smart_pointer/src/main.rs
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+// Recursive type using boxes
+enum List {
+    Cons(i32, Box<List>),
+    Nil,
+}
+
+fn main() {
+    // Storing `i32` value on heap
+    let b = Box::new(5);
+    println!("b = {}", b);
+
+    use crate::List::{Cons, Nil};
+    let list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
+}