Macro context_key 

macro_rules! context_key {
    ($name:ident, $type:ty) => { ... };
}

Macro for creating context keys

This macro creates a typed context key that can be used for type-safe context access.

Example

use foundation_utils::context_key;

context_key!(USER_ID, String);
context_key!(REQUEST_ID, String);
context_key!(TRACE_ID, String);