add concat-string macro

Cargo.lock

@@ -99,6 +99,12 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98cc8fbded0c607b7ba9dd60cd98df59af97e84d24e49c8557331cfc26d301ce"
 
+[[package]]
+name = "concat-string"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7439becb5fafc780b6f4de382b1a7a3e70234afe783854a4702ee8adbb838609"
+
 [[package]]
 name = "criterion"
 version = "0.5.1"
@@ -361,6 +367,7 @@ checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
 name = "rust_benchmark"
 version = "0.1.0"
 dependencies = [
+ "concat-string",
  "criterion",
 ]
 

Cargo.toml

@@ -10,6 +10,7 @@ path = "src/lib.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+concat-string = "1.0.1"
 criterion = "0.5.1"
 
 [[bench]]

benches/my_benchmark.rs

@@ -1,6 +1,6 @@
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
 
-use rust_benchmark::{concat_with_format, concat_with_plus};
+use rust_benchmark::{concat_with_concat_string_macro_crate, concat_with_format, concat_with_plus};
 
 const A: &str = "post";
 const B: &str = "/fasjhiofasihofas";
@@ -12,6 +12,9 @@ pub fn criterion_benchmark(c: &mut Criterion) {
     c.bench_function("concat with plus", |b| {
         b.iter(|| concat_with_plus(black_box(A), black_box(B)));
     });
+    c.bench_function("concat with concat-string crate", |b| {
+        b.iter(|| concat_with_concat_string_macro_crate(black_box(A), black_box(B)));
+    });
 }
 
 criterion_group!(benches, criterion_benchmark);

src/lib.rs

@@ -1,3 +1,6 @@
+#[macro_use(concat_string)]
+extern crate concat_string;
+
 pub fn concat_with_format(a: &str, b: &str) -> String {
     let c = format!("{} {}", a, b);
     c
@@ -8,6 +11,11 @@ pub fn concat_with_plus(a: &str, b: &str) -> String {
     c
 }
 
+pub fn concat_with_concat_string_macro_crate(a: &str, b: &str) -> String {
+    let c = concat_string!(a, " ", b);
+    c
+}
+
 pub fn add(left: usize, right: usize) -> usize {
     left + right
 }