Swap the value of the specified a object with the value of the specified b object.
This method provides the no-throw exception-safety guarantee if either a.type() is the same as b.type() and a and b were created with the same allocator, or neither a.type() nor b.type() is a type that requires allocation; otherwise, it provides the basic guarantee.
| Name | Description |
|---|---|
| a | first object to exchange |
| b | second object to exchange |