如何在 num 库的 BigInt 结构上实现 Deserialize 特征？

Question

我正在使用 toml 来解析数据，我有这个结构：

use serde_derive::Deserialize;
use toml::value::Datetime;

#[derive(Debug, Deserialize)]
pub struct Trade {
    pub action: Action,
    pub date_time: Datetime,
    pub exchange: Exchange,
    pub fee: i64,
    pub id: Option<String>,
    pub matched: Option<bool>,
    pub price: i64,
    pub quantity: i64,
}

我想用 BigInt, a struct from the num 库替换整数 (i64)。

这可能吗？我必须自己实现 Deserialize 特性吗？

Answer 1

一般来说，你不能。有关详细信息，请参阅 How do I implement a trait I don't own for a type I don't own?

对于您的具体情况，num 已经有一个 feature：

The serde feature enables serialization for types in num-bigint, num-complex, and num-rational.

所以就用它吧：

[dependencies.num]
version = "0.3"
features = ["serde"]

如何在 num 库的 BigInt 结构上实现 Deserialize 特征？

How can I implement the Deserialize trait on the BigInt struct from the num library?

struct

rust

data-structures

serde