Macro fasteval::eval_compiled_ref

macro_rules! eval_compiled_ref {
    ($evaler:ident, $slab_ref:expr, $ns_mut:expr) => { ... };
    ($evaler:expr, $slab_ref:expr, $ns_mut:expr) => { ... };
}

The same as evaler_ref.eval(&slab, &mut ns), but more efficient for common cases.

This macro is exactly the same as eval_compiled!() but is useful when you hold a reference to the evaler, rather than having ownership of it.

Only use this for compiled expressions. (If you use it for interpreted expressions, it will work but will always be slower than calling eval() directly.)

This macro is able to eliminate function calls for constants and Unsafe Variables. Since evaluation is a performance-critical operation, saving some function calls actually makes a huge performance difference.