An "overflow" arithmetic operator in Swift

You know that Swift has arithmetic operators similar to C,OBJC, which are:

+
-
*
/
%

But you may not know that there is a big difference between the operators in Swift and the C,OBJC language that they cannot be "spilled", either overflow or underflow!

In lower-level languages such as C, if you do arithmetic on an arithmetic value that can overflow, the result is a so-called overflow or underflow, such as your maximum Int32 positive plus one result is a large negative number:-2147483648

In Swift, however, if this happens, the runtime throws an exception and your app hangs!

This may not be the result you want, but Swift itself also provides a series of "overflow" operators corresponding to the arithmetic operators, as follows:

&+
&-
&*
&/
&%

Their behavior is exactly the same as the operators in the C,OBJC, so you can use this now without incurring a run-time error:

It is worth noting, however, that these "overflow" operators do not have a compound syntax, so you cannot write like this:

var= Int32.max&+=100

An "overflow" arithmetic operator in Swift