[swift-evolution] [Proposal] Add floor() and ceiling() functions to FloatingPoint

Charlie Monroe charlie at charliemonroe.net
Sun Jun 26 23:45:22 CDT 2016

```Given the API guidelines, it should be

rounded, ceiled, floored

for returning the rounded/ceiled/floored value and

round(), ceil(), floor()

would be the mutating variants. Question is where it's not too confusing for anyone knowing these from another language.

> On Jun 25, 2016, at 9:02 PM, Remy Demarest via swift-evolution <swift-evolution at swift.org> wrote:
>
> We don't seem to have a rounded() function either as part of FloatingPoint, we should probably have these methods in the end:
>
> func rounded() -> Self
> func rounded(withPrecision: Int) -> Self
>
> Along with the 4 other methods proposed below.
>
>> Le 25 juin 2016 à 11:55, Haravikk via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> a écrit :
>>
>>
>>> On 25 Jun 2016, at 11:06, Karl via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>>>
>>> floor() and ceil(), exactly like C. ceiling() is more descriptive and is a mathematical term of art <http://mathworld.wolfram.com/CeilingFunction.html>.
>>> nextIntegralUp() and nextIntegralDown() are more descriptive still, but possibly misleading as (4.0).nextIntegralUp() == 4.0
>> I'm in favour of these capabilities being there, but in terms of naming I've often wondered why it can't just be part of a rounding group of methods like so:
>>
>> 	func roundedUp() -> Self { … }
>> 	func roundedUp(withPrecision:Int) -> Self { … }
>> 	func roundedDown() -> Self { … }
>> 	func roundedDown(withPrecision:Int) -> Self { … }
>>
>> Since the methods with implied precision of zero are equivalent to floor and ceiling surely? I know floor and ceiling are pretty common terms, but they're just a form rounding when it comes down to it.
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