Hi, I tried to write a generic function to compare all Integer and Float with 0, but compile failed. Any suggestion? Thanks! fn eq_zero<T: std::cmp::PartialEq>(a:T) -> bool { if a == 0 { true } else { false } } fn main() { println!("{}",eq_zero(0) ); println!("{…

When you write 0 that's actually an i32 constant, and because your function requires T: PartialEq (i.e. T is only comparable with itself) you get a type mismatch error. rustc is effectively saying You've written a function which accepts any arbitrary T which can be compared for equality with anot…

0 is not a floating point value. You would need '0.0' Which is a good reminder that it is generally a bad idea to compare floating point values for equality. Very often things that you think should be equal are not.

In IEEE754 floating point arithmetics, 0 is not equals to -0. No, I remembered it wrong. They're not identical, but considered equals. Also 0.1 + 0.2 - 0.3 is not zero. Rust Playground A browser interface to the Rust compiler to experiment with the language …

Generic function compare Integer and Float with 0

help

davyzhu April 12, 2021, 2:58am 5

Thank you!

[Tip] Generic function compare any Integer or Float type with 0

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Generic function compare Integer and Float with 0

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