lifetime `'static` required? about cached HOT 4 CLOSED

ah, right sorry - convert + key is enough, or convert + type. The macro just needs to know what to replace the cache type's key with instead of using the tuple of function arguments

#[cached(
    key = "String",
    convert = r#"{ format!("{}{}", a, b) }"#
)]
fn keyed(a: &str, b: &str) -> usize {
    let size = a.len() + b.len();
    sleep(Duration::new(size as u64, 0));
    size
}

from cached.

This is because the cache key is generated by making a tuple out of the function arguments, and the resulting cache key needs to be Clone + Hash. You can pass a convert block to the macro to tell it how to create the cache key from your arguments (ex from the readme, you can ignore the type and create blocks)

use std::thread::sleep;
use std::time::Duration;
use cached::proc_macro::cached;
use cached::SizedCache;

/// Use an explicit cache-type with a custom creation block and custom cache-key generating block
#[cached(
    type = "SizedCache<String, usize>",
    create = "{ SizedCache::with_size(100) }",
    convert = r#"{ format!("{}{}", a, b) }"#
)]
fn keyed(a: &str, b: &str) -> usize {
    let size = a.len() + b.len();
    sleep(Duration::new(size as u64, 0));
    size
}

from cached.

By "you can ignore the type and create blocks" did you mean I don't need to include them? Or to ignore the ones from the example and include my own specific ones? When I leave them off I get:

error: custom attribute panicked     
  --> src\data.rs:72:1
   |
72 | / #[cached(
73 | |     time = 240,
74 | |     result = true,
75 | |     convert = r#"{ format!("{}-{}", a, b) }"#
76 | | )]
   | |__^
   |
   = help: message: convert requires key or type to be set

And if needed, do I need both type and create or will only type suffice?

from cached.

That works thanks

from cached.