move-semantics
The title is a little misleading in this chapter we will focus on what the assignment operator = .
In Cpp there is the concept of move semantic for those familiar with it here some more readings:
Long Story Short, the move semantics move the ownership of heap allocated memory to the variable that is assigned to. The concept is the same as in C++ but rust have it as default behaviour so no need of extra syntax. For sake of optimization copy are avoided, but if necessary it need to be explicit.
| type | behaviour | comment |
|---|---|---|
| scalar | copy | |
| array | copy | |
| vector | move | The original variable is not accessible anymore |
| String | move | The original variable is not accessible anymore |
| String literal | copy |
In the string literal the data is not copied, only the memory related to the type get copied, in other word the pointer.