What are the alternatives to pattern-matching floating point numbers?

Question

Rust has decided to disallow float literals in patterns: Matching on floating-point literal values is totally allowed and shouldn\'t be #41255. It is currently a warning but

Answer 1

You can use a match guard:

match point {
    Point { x, y } if x == 5.0 => println!("y is {} when x is 5", y),
    _ => println!("x is not 5"),
}

This puts the responsibility back on to you, so it doesn't produce any sort of warning.

Floating point equality is an interesting subject though... so I would advise that you look further into it since it may be a source of bugs (which I imagine is the reason the Rust core team don't want to match against floating point values).