Update borrowing.md (#222)

igor-petruk · web-flow · commit 4c052d33c81d · 2023-01-23T11:24:17.000Z
diff --git a/src/ownership/borrowing.md b/src/ownership/borrowing.md
@@ -46,7 +46,7 @@ Notes on stack returns:
   }
   ```
 * The Rust compiler can do return value optimization (RVO).
-* In C++, copy elision has to be defined in the language specification because constructors can have side effects. In Rust, this is not an issue at all.
+* In C++, copy elision has to be defined in the language specification because constructors can have side effects. In Rust, this is not an issue at all. If RVO did not happen, Rust will always performs a simple and efficient `memcpy` copy.
 
 </details>
 

Original file line number	Diff line number	Diff line change
`@@ -46,7 +46,7 @@ Notes on stack returns:`
`46`	`46`	`}`
`47`	`47`	```
`48`	`48`	`* The Rust compiler can do return value optimization (RVO).`
`49`		`-* In C++, copy elision has to be defined in the language specification because constructors can have side effects. In Rust, this is not an issue at all.`
	`49`	+* In C++, copy elision has to be defined in the language specification because constructors can have side effects. In Rust, this is not an issue at all. If RVO did not happen, Rust will always performs a simple and efficient `memcpy` copy.
`50`	`50`
`51`	`51`	`</details>`
`52`	`52`