what is Generics？
the essence of Generics is assuming it to be certain type。
the true type is not know until excution
- how to use generics in function？
fn <T,U>name(st:T):U{
}
- how to use generics in stuct？
stuct A <T,U> {
string:T
age:U
}
impl <T,U> A <T,U> {
fn say<T2>(&self,param:T2) -> T2 {
return param;
}
}
`3. how to use generics in enum？``
enum Result <T,U>{
Ok(T),
Err(U)
}
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