armanriazi rust error E0277 can't compare `&{
The Rust error E0277 occurs when you try to compare a reference to a value that doesn't implement the PartialEq
trait. To fix this error, you need to ensure that the type of the value being compared implements the PartialEq
trait. Here's an example of how you can resolve this error:
struct MyStruct {
value: i32,
}
fn main() {
let a = MyStruct { value: 10 };
let b = MyStruct { value: 20 };
if &a == &b {
println!("Values are equal");
} else {
println!("Values are not equal");
}
}
In this example, the MyStruct
type does not implement the PartialEq
trait, so comparing references to MyStruct
values will result in the E0277 error. To fix this, you can implement the PartialEq
trait for MyStruct
:
struct MyStruct {
value: i32,
}
impl PartialEq for MyStruct {
fn eq(&self, other: &Self) -> bool {
self.value == other.value
}
}
fn main() {
let a = MyStruct { value: 10 };
let b = MyStruct { value: 20 };
if &a == &b {
println!("Values are equal");
} else {
println!("Values are not equal");
}
}
Now, the code will compile without the E0277 error because the PartialEq
trait is implemented for MyStruct
.