Changed print output to line-by-line (can be re-set to debug print output with feature flag.)

Fortune for reverse's current commit: Middle blessing − 中吉

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "reverse"
+version = "0.2.0"

Cargo.toml

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+[package]
+name = "reverse"
+version = "0.2.0"
+authors = ["Avril <flanchan@cumallover.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+default = ["output-lines"]
+
+# Output as lines instead of `["2", "1", "0"]`
+output-lines = []
+
+# Print each string escaped
+output-quoted = []
+
+[profile.release]
+opt-level = 3
+lto = "fat"
+codegen-units = 1
+strip=true
+
+[dependencies]

Makefile

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+
+
+reverse:
+	RUSTFLAGS="-C target-cpu=native" cargo build --release
+	strip target/release/$@

src/main.rs

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+
+//#[inline] 
+fn reverse<T>(slice: &mut [T])
+{
+    match slice {
+	[ref mut a, ref mut rest @ .., ref mut b] => {
+	    std::mem::swap(a, b);
+	    reverse(rest)
+	},
+	[] | [_] => (),
+    }
+}
+
+/// This actually works! And is so easily parallelisable with something like rayon, or asyncing by spawning/creating the tail-call into a new task, then either waiting them concurrently or in parallen (spawn or created future from just calling the function without awaiting it)
+#[allow(dead_code)]
+fn binsearch<'a, V: ?Sized, T: PartialEq<V> + 'a>(slice: &'a [T], find: &V) -> Option<&'a T>
+{
+    match slice {
+	[ref a, pivot @ .., ref b] => {
+		match (a==find, b==find) {
+		    (true, _) => Some(a),
+		    (_, true) => Some(b),
+		    _ => binsearch(pivot, find),
+		}
+	},
+	[ref a] if a == find => Some(a),
+	_ => None,
+    }
+}
+
+fn main() {
+    let mut args: Vec<String> = std::env::args().skip(1).collect();
+    reverse(&mut args[..]);
+    //eprintln!("{:?}", binsearch(&args[..], "1")); // It works!
+    #[cfg(feature="output-lines")]
+    {
+	for x in args.iter() {
+	    #[cfg(feature="output-quoted")] println!("{:?}", x);
+	    #[cfg(not(feature="output-quoted"))] println!("{}", x);
+	}
+    }
+    #[cfg(not(feature="output-lines"))]
+    println!("{:?}", args);
+}