armanazi rust error E0277 `Point<{integer}, {float}>` cannot be formatted using `
Error E0277 in Rust is a common error that occurs when you try to format a value that does not implement the std::fmt::Display
trait. The specific error message you mentioned, Point<{integer}, {float}>
cannot be formatted using .
, suggests that you are trying to format a Point
struct containing an integer and a float.
To resolve this error, you need to implement the std::fmt::Display
trait for your Point
struct. This trait allows you to define how your struct should be formatted as a string when using the format!
macro or similar formatting functions.
Here's an example of how you can implement std::fmt::Display
for the Point
struct:
struct Point<T, U> {
x: T,
y: U,
}
impl<T: std::fmt::Display, U: std::fmt::Display> std::fmt::Display for Point<T, U> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "({}, {})", self.x, self.y)
}
}
In this example, we define a generic Point
struct with two type parameters T
and U
for the x and y coordinates respectively. We then implement the std::fmt::Display
trait for Point<T, U>
, where T
and U
must also implement std::fmt::Display
. Inside the fmt
method, we use the write!
macro to format the struct as a string in the desired format, in this case, "(x, y)".
Once you have implemented std::fmt::Display
for your Point
struct, you should be able to format and display instances of Point
without encountering the E0277 error.