Attribute Macro timed::timed

#[timed]

Times the execution of the function

Examples

#[timed::timed]
fn add(x: i32, y: i32) -> i32 {
    x + y
}

It will output:

// function=add duration=112ns

The implementation renames the given function by sufixing it with _impl_ so in this case you will have fn _impl_add(x:i32, y:i32) and creates a new function with the original name.

Thie is the final output after the macro expands:

fn _impl_add(x:i32, y:i32) -> i32 {
    x + y
}

fn add(x: i32, y:i32) -> i32 {
    use std::time::Instant;
    let _start = Instant::now();
    let res = _impl_add(x, y);
    println!("function={} duration={:?}", "add", _start.elapsed());
    res
}

Currently it works with functions passed by value only, or no parameters at all.

Work in progress to cover more cases.