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Add When Overflow Is Desired as a clojure til.

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jbranchaud
2015-08-21 11:03:27 -05:00
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clojure/when-overflow-is-desired.md Normal file
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# When Overflow Is Desired
If you try to add two `MAX_VALUE` Longs, Clojure is kind enough to warn you.
```clojure
> (+ Long/MAX_VALUE Long/MAX_VALUE)
ArithmeticException integer overflow clojure.lang.Numbers.throwIntOverflow (Numbers.java:1424)
```
However, when overflow is desired, you can use the *unchecked* operators
(e.g. `unchecked-add`).
```clojure
> (unchecked-add Long/MAX_VALUE Long/MAX_VALUE)
-2
```
See also `unchecked-subtract` and `unchecked-multiply`.