Trait for a maximum value of a type

[kornel]

There are constants like std::u32::MAX, but AFAIK there’s no generic way to get the maximum.

I was writing an algorithm that works on Ord, but I needed a special value that is higher than all other values. I’ve had to roll my own trait for this, but It’d be nice to have that in stdlib.

[llogiq]

Why did you need that value? Were you calculating some minimum and needed a default?

[kornel]

Yes, exactly. I’m creating and searching a binary tree, and I need special values for the leaves and a starting point when searching it.

I know I could theoretically avoid having a placeholder maximum, but having it makes the code simpler.

[joliv]

http://doc.rust-lang.org/num/num/traits/trait.Bounded.html

: )

[llogiq]

I’d also like to refer you to the min() (also max()) method that is implemented for Iterator<T> where T: Ord.

[kornel]

That’s what I was looking for! It didn’t come up in the search though

http://doc.rust-lang.org/std/?search=maximum

http://doc.rust-lang.org/std/?search=bounded

[llogiq]

No problem. I agree that traits sometimes makr for suboptimal discoverability. Searching for min immediately brought me there, luckily.

[stdsync]

That’s what I was looking for! It didn’t come up in the search though

Searching in the “std” docs apparently doesn’t bring up results for other crates…

[system]

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