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generics覚書

Posted at

structでgenericsを使う際にどういう定義をしたらよいか
迷ってChatGPT先生に教えていただいたので覚書。
また、得られた自由な型をFromトレイトを使ってどう定義すれば
よいかもChatGPT先生にお伺いした。

#[derive(Debug)]
struct MyStruct<T> {
    my_val: T,
}

impl<T> MyStruct<T> {
    fn new(val: T) -> Self {
        Self {
            my_val: val,
        }
    }
}

impl<T> From<&'static str> for MyStruct<T>
where
    T: From<&'static str>,
{
    fn from(s: &'static str) -> Self {
        Self::new(T::from(s))
    }
}

impl<T> From<String> for MyStruct<T>
where
    T: From<String>,
{
    fn from(s: String) -> Self {
        Self::new(T::from(s))
    }
}

fn main() {
    let struct1: MyStruct<&str> = MyStruct::from("string: &str");
    let struct2: MyStruct<String> = MyStruct::from(String::from("string: String"));

    println!("{struct1:?}");
    println!("{struct2:?}");
}
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