From aca23fa6fd2c2dbe63e4c67893110f385c9cb881 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Thu, 3 Feb 2022 22:02:18 +0800
Subject: [PATCH] feat: add qcell

---
 __concurrent/qcell/Cargo.lock  | 25 +++++++++++++++++++++++++
 __concurrent/qcell/Cargo.toml  | 10 ++++++++++
 __concurrent/qcell/src/main.rs | 16 ++++++++++++++++
 3 files changed, 51 insertions(+)
 create mode 100644 __concurrent/qcell/Cargo.lock
 create mode 100644 __concurrent/qcell/Cargo.toml
 create mode 100644 __concurrent/qcell/src/main.rs

diff --git a/__concurrent/qcell/Cargo.lock b/__concurrent/qcell/Cargo.lock
new file mode 100644
index 0000000..9330b48
--- /dev/null
+++ b/__concurrent/qcell/Cargo.lock
@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "once_cell"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da32515d9f6e6e489d7bc9d84c71b060db7247dc035bbe44eac88cf87486d8d5"
+
+[[package]]
+name = "qcell"
+version = "0.1.0"
+dependencies = [
+ "qcell 0.5.0",
+]
+
+[[package]]
+name = "qcell"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5023f06b72bfa9fbb5ebdbe891f02db9406ba026990e0778f80094bc84f3ac8"
+dependencies = [
+ "once_cell",
+]
diff --git a/__concurrent/qcell/Cargo.toml b/__concurrent/qcell/Cargo.toml
new file mode 100644
index 0000000..9e52cb0
--- /dev/null
+++ b/__concurrent/qcell/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "qcell"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+qcell = "0.5.0"
+
diff --git a/__concurrent/qcell/src/main.rs b/__concurrent/qcell/src/main.rs
new file mode 100644
index 0000000..59af9be
--- /dev/null
+++ b/__concurrent/qcell/src/main.rs
@@ -0,0 +1,16 @@
+use std::rc::Rc;
+use qcell::{QCell, QCellOwner};
+
+// https://docs.rs/qcell/latest/qcell/
+fn main() {
+    let mut owner = QCellOwner::new();
+
+    let item = Rc::new(QCell::new(&owner, Vec::<u8>::new()));
+    let iref = owner.rw(&item);
+    // test(&mut owner, &item);    // Compile error
+    iref.push(1);
+
+    fn test(owner: &mut QCellOwner, item: &Rc<QCell<Vec<u8>>>) {
+        owner.rw(&item).push(2);
+    }
+}