From eb8b75eff1b16f0656c1e9e79cc81b237d01438b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BD=92=E6=95=85=E9=87=8C?= <3326284481@qq.com>
Date: Thu, 29 Feb 2024 21:58:41 +0800
Subject: [PATCH] Modifies the description of self-assignment in the move
assignment operator.
---
...move-constructors-and-move-assignment-operators-cpp.md | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/docs/cpp/move-constructors-and-move-assignment-operators-cpp.md b/docs/cpp/move-constructors-and-move-assignment-operators-cpp.md
index 9cbab78ea2..b00f547676 100644
--- a/docs/cpp/move-constructors-and-move-assignment-operators-cpp.md
+++ b/docs/cpp/move-constructors-and-move-assignment-operators-cpp.md
@@ -125,7 +125,7 @@ The following procedures describe how to write a move constructor and a move ass
}
```
-1. In the move assignment operator, add a conditional statement that performs no operation if you try to assign the object to itself.
+1. In the move assignment operator, we need to keep the self-assignment safe, and the simple way is to add a judgment directly.
```cpp
if (this != &other)
@@ -133,6 +133,12 @@ The following procedures describe how to write a move constructor and a move ass
}
```
+ There are many other ways, too, such as `copy-and-swap`.
+
+ ```cpp
+ shared_ptr(_Right).swap(*this);
+ ```
+
1. In the conditional statement, free any resources (such as memory) from the object that is being assigned to.
The following example frees the `_data` member from the object that is being assigned to: