【Anyhow】更多的错误信息

环境

• Time 2022-01-20
• Rust 1.58.0
• Anyhow 1.0.52

概念

参考：https://docs.rs/anyhow/latest/anyhow/

示例

toml

[package]
edition = "2021"
name = "game"
version = "0.1.0"

[dependencies]
anyhow = "*"
serde = {version = "*", features = ["derive"]}
serde_json = "*"

main.rs

use anyhow::{Context, Result};
use serde::Deserialize;

#[derive(Deserialize)]
struct User {
    name: String,
    age: u8,
}

fn main() -> Result<()> {
    let path = "user.json";
    let config = std::fs::read_to_string(path)
        .with_context(|| format!("Failed to read from {path}"))?;
    let user: User = serde_json::from_str(&config)?;
    println!("name: {}, age: {}", user.name, user.age);
    Ok(())
}

总结

对错误添加多的上下文信息，更友好和详细的错误显示。

附录