use std::boxed::Box;
use std::ops::Range;

struct Schema {
    test: bool,
    testfn: Box<Fn(Range<usize>) -> String>,
}

impl Schema {
    fn new<F: 'static>(test_in: F) -> Self
        where F: Fn(Range<usize>) -> String
    {
        Schema{
            test: true,
            testfn: Box::new(test_in),
        }
    }
}

fn range_func(r: Range<usize>)->String {
     format!("range() min:{} max:{}",r.start,r.end)
}

fn main() {
    println!("Fn range: {}",range_func(0..7));
    let range_closure= |r: Range<usize>| {
       format!("range() min:{} max:{}",r.start,r.end)
    };
    println!("Closure: {}", range_closure(0..7));
    let schema_two = Schema::new(range_closure(0..7));
    //println!("in Box range: {}",(schema_two.testfn)());
}