A library to quickly get the live/total/max counts of allocated instances.

```rust

[derive(Default)]

struct Widget { _c: countme::Count, }

let w1 = Widget::default(); let w2 = Widget::default(); let w3 = Widget::default(); drop(w1);

let counts = countme::get::(); asserteq!(counts.live, 2); asserteq!(counts.maxlive, 3); asserteq!(counts.total, 3);

eprintln!("{}", countme::get_all()); ```