serdeにおいてPhantomData型はデフォルトでは空の値として扱われ,例えば以下のVideo型を use serde::{Deserialize, Serialize}; use std::marker::PhantomData; #[derive(Debug, Serialize, Deserialize, PartialEq)] struct Video<T> { file_type: PhantomData<T>, file_name: String, } impl<T> Video<T> { fn new(file_name: String) -> Video<T> { Video { file_name, file_type: PhantomData, } } } #[derive(Debug, PartialEq)] struct Mp4; #[derive(Debug
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