benchmarking

Cargo.toml

@@ -6,6 +6,12 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+default = ["experimental_inserter"]
+
+# Use non-allocating array inserter
+experimental_inserter = []
+
 [dependencies]
 tokio = {version = "0.2", features=["full"]}
 async-trait = "0.1.40"

src/ext.rs

@@ -3,18 +3,26 @@ use super::*;
 
 pub trait VecExt<T>
 {
-    /// Insert many elements
+    /// Insert many elements with exact size iterator
-    fn move_insert<Ex, I: IntoIterator<Item = T, IntoIter = Ex>>(&mut self, location: usize, slice: I)
+    fn insert_exact<Ex, I: IntoIterator<Item = T, IntoIter = Ex>>(&mut self, location: usize, slice: I)
     where Ex: ExactSizeIterator<Item = T> + std::panic::UnwindSafe;
 
     /// Insert many elements
-    fn splice_insert<I: IntoIterator<Item =T>>(&mut self, location: usize, slice: I);
+    fn insert_many<I: IntoIterator<Item =T>>(&mut self, location: usize, slice: I);
 }
 
 
 impl<T> VecExt<T> for Vec<T>
 {
-    fn move_insert<Ex, I: IntoIterator<Item = T, IntoIter = Ex>>(&mut self, location: usize, slice: I)
+    #[cfg(not(feature="experimental_inserter"))]
+    #[inline(always)]
+    fn insert_exact<Ex, I: IntoIterator<Item = T, IntoIter = Ex>>(&mut self, location: usize, slice: I)
+    where Ex: ExactSizeIterator<Item = T> + std::panic::UnwindSafe
+    {
+	self.insert_many(location, slice)
+    }
+    #[cfg(feature="experimental_inserter")] 
+    fn insert_exact<Ex, I: IntoIterator<Item = T, IntoIter = Ex>>(&mut self, location: usize, slice: I)
     where Ex: ExactSizeIterator<Item = T> + std::panic::UnwindSafe,
     {
 	#[inline(never)]
@@ -79,7 +87,7 @@ impl<T> VecExt<T> for Vec<T>
 	    self.set_len(len + sent);
 	}
     }
-    fn splice_insert<I: IntoIterator<Item =T>>(&mut self, location: usize, slice: I)
+    fn insert_many<I: IntoIterator<Item =T>>(&mut self, location: usize, slice: I)
     {
 	let slice = slice.into_iter();
 	match slice.size_hint() {
@@ -98,17 +106,17 @@ mod tests
 {
     use super::*;
     #[test]
-    fn vec_move_insert()
+    fn vec_insert_exact()
     {
 	let mut vec = vec![0,1,2,8,9,10];
-	vec.move_insert(3, [3,4,5,6, 7].iter().copied());
+	vec.insert_exact(3, [3,4,5,6, 7].iter().copied());
 
 	assert_eq!(&vec[..],
 		   &[0,1,2,3,4,5,6,7,8,9,10]
 	);
     }
     #[test]
-    fn vec_move_insert_nt()
+    fn vec_insert_exact_nt()
     {
 	macro_rules! string {
 	    ($str:literal) => (String::from($str));
@@ -128,7 +136,7 @@ mod tests
 	    string!("uhh"),
 	];
 
-	vec.move_insert(2, vec![string!("hi"), string!("hello")]);
+	vec.insert_exact(2, vec![string!("hi"), string!("hello")]);
 
 	assert_eq!(&vec[..], &vec2[..]);
     }
@@ -140,6 +148,16 @@ mod tests
 	use test::{
 	    Bencher, black_box,
 	};
+	#[cfg(not(feature="experimental_inserter"))]
+	#[bench]
+	fn move_exact(b: &mut Bencher)
+	{
+	    let mut vec = vec![0,10,11,12];
+	    let span = [0,1,2,3];
+	    b.iter(|| {
+		black_box(vec.insert_exact(2, span.iter().copied()));
+	    });   
+	}
 	#[bench]
 	fn move_via_splice(b: &mut Bencher)
 	{
@@ -147,18 +165,18 @@ mod tests
 	    let span = [0,1,2,3];
 
 	    b.iter(|| {
-		black_box(vec.splice_insert(2, span.iter().copied()));
+		black_box(vec.insert_many(2, span.iter().copied()));
 	    });
 	}
+	#[cfg(feature="experimental_inserter")]
 	#[bench]
 	fn move_via_unsafe(b: &mut Bencher)
 	{
 	    let mut vec = vec![0,10,11,12];
 	    let span = [0,1,2,3];
 	    b.iter(|| {
-		black_box(vec.move_insert(2, span.iter().copied()));
+		black_box(vec.insert_exact(2, span.iter().copied()));
 	    });
 	}
     }
-
 }

src/main.rs

@@ -26,5 +26,5 @@ mod post;
 mod state;
 
 fn main() {
-    println!("Hello, world!");
+    
 }