Macro track_var 

macro_rules! track_var {
    ($var:expr) => { ... };
}

[RECOMMENDED] Track a variable’s memory allocation without taking ownership.

This is the default and recommended tracking macro for most use cases. It performs zero-cost tracking by reference, allowing continued use of the original variable.

✅ Use this when:

• You want to track memory usage without changing your code
• Performance is critical (zero overhead)
• You need to continue using the variable after tracking
• You’re tracking many variables and don’t want clone overhead
• You’re doing basic memory profiling and analysis

❌ Don’t use this when:

• You need precise lifecycle tracking with automatic cleanup
• You’re tracking temporary variables that will be moved/consumed immediately

Example

use memscope_rs::track_var;

let my_vec = vec![1, 2, 3, 4, 5];
track_var!(my_vec); // Zero-cost tracking