我有一个对象,并希望每个日志记录输出都以该对象的某些状态为前缀。但是为每个日志记录语句添加前缀非常不便。有没有简单的实现方法?
下面是示例代码。
use log::info;
struct Obj {
id: i32,
name: String,
}
impl Obj {
// can I use `info!("receive {} from {}", item, from);` for simplicity?
fn call_me(&self, item: i32, from: String) {
info!("[id: {}][name: {}] receive {} from {}", self.id, self.name, item, from);
}
// ...many methods
}
任何帮助将不胜感激!
您可以为此编写一个宏:
#[macro_export]
macro_rules! log {
($sel:ident, $($arg:tt)*)
=>
(info!("[id: {}] [name: {}] {}", $sel.id, $sel.name, &format!($($arg)*)));
}
struct Obj {
id: i32,
name: String,
}
impl Obj {
// can I use `info!("receive {} from {}", item, from);` for simplicity?
fn call_me(&self, item: i32, from: String) {
log!(self, "receive {} from {}", item, from);
}
}
这并不完美,因为您仍然需要通过self
,但我不确定您可以做得更好。