Hi,
I am trying to create a generic function to return value depending on the
enum passed. But I don't know to create a generic trait for enum.
In following example, print_value works but I don't know how I can write a
generic get_value function to get value from enum.
#[deriving(Show)]
enum MyTypes{
MyBool(bool),
MyStr(String),
MyInt(int)
}
fn print_value(arg: MyTypes){
match arg{
MyBool(x) => println!("Bool: {}", x),
MyStr(x) => println!("String: {}", x),
MyInt(x) => println!("Int: {}", x),
}
}
fn main(){
print_value(MyBool(true));
// Following lines not working, how to write get_value func?
// let a: bool = get_value(MyBool(true));
// println!("{}", a);
}
In case of struct it is simple,
struct MyInt {
value: int
}
struct MyBool{
value: bool
}
trait Value<S>{
fn get(&self) -> S;
}
impl Value<int> for MyInt{
fn get(&self) -> int{
self.value
}
}
impl Value<bool> for MyBool{
fn get(&self) -> bool{
self.value
}
}
fn get_value<S, T: Value<S>>(arg: T) -> S{
arg.get()
}
fn main(){
let a: bool = get_value(MyBool{value: true});
println!("{}", a);
let b: int = get_value(MyInt{value: 100});
println!("{}", b);
}
Please help in writing generic function for enum.
--
Regards
Aravinda | ಅರವಿಂದ
http://aravindavk.in
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