part2の学習

Author: okamoto

part2/app/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "app"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+library = {path = "../library", default-features = false, features = ["serde", "special"]}

part2/app/src/main.rs

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+fn main() {
+    library::serde();
+    library::special();
+}

part2/bench/Cargo.toml

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+[package]
+name = "bench"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

part2/bench/src/lib.rs

@@ -0,0 +1,26 @@
+#![feature(test)]
+
+pub fn hash(x: u64) -> u64 {
+    let mut y = x;
+    for _ in 0..512 {
+        y = y << 5;
+        y = y ^ x;
+    }
+    y
+}
+
+#[cfg(test)]
+mod tests {
+    extern crate test;
+
+    use super::*;
+    use test::Bencher;
+
+    #[bench]
+    fn bench_hash(b: &mut Bencher) {
+        b.iter(|| {
+            let n = test::black_box(2);
+            hash(n)
+        });
+    }
+}

part2/clippy/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "clippy"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

part2/clippy/src/main.rs

@@ -0,0 +1,13 @@
+fn main() {
+    let mut a = 0;
+    let mut b = 1;
+
+    #[allow(clippy::almost_swapped)]
+    {
+        a = b;
+        b = a;
+    }
+
+    dbg!(a);
+    dbg!(b);
+}

part2/library/Cargo.toml

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+[package]
+name = "library"
+version = "0.1.0"
+edition = "2018"
+
+[features]
+# デフォルトで有効になるフィーチャ
+default = ["parallel", "serde"]
+
+# 依存関係を持たないフィーチャ
+special = []
+
+# 依存クレートを持つフィーチャ
+parallel = ["crossbeam"]
+
+# 依存クレートのフィーチャを有効にするフィーチャ
+nightly = ["crossbeam/nightly"]
+
+# いろいろな依存関係を混ぜた例
+full = ["crossbeam/nightly", "parallel", "serde"]
+
+[dependencies]
+crossbeam = {version = "0.7.3", optional = true}
+serde = {version = "1.0.111", optional = true}

part2/library/src/lib.rs

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+#[cfg(feature = "parallel")]
+pub fn parallel() {
+    println!("parallel is enabled");
+}
+
+#[cfg(feature = "serde")]
+pub fn serde() {
+    println!("serde is enabled");
+}
+
+#[cfg(feature = "special")]
+pub fn special() {
+    println!("special is enabled");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[cfg(feature = "parallel")]
+    #[test]
+    fn test_parallel() {
+        parallel();
+    }
+
+    #[cfg(feature = "serde")]
+    #[test]
+    fn test_serde() {
+        serde();
+    }
+
+    #[cfg(feature = "special")]
+    #[test]
+    fn test_special() {
+        special();
+    }
+}

part2/sample/Cargo.toml

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+[workspace]
+
+members = [
+    "main",
+    "sub",
+]

part2/sample/main/Cargo.toml

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+[package]
+name = "main"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+sub = {path = "../sub", versionk = "0.1.0"}