1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

use std::collections::HashMap;

use rbatis_core::Error;

use crate::ast::node::node_type::NodeType;

pub trait ToResult<T> {
    fn to_result<F>(&self, fail_method: F) -> Result<&T, Error>
        where F: Fn() -> String;
}

impl<T> ToResult<T> for Option<&T> {
    fn to_result<F>(&self, fail_method: F) -> Result<&T, Error>
        where F: Fn() -> String {
        if self.is_none() {
            return Err(Error::from(fail_method()));
        }
        return Ok(self.unwrap());
    }
}

#[test]
fn test_to_result() {
    let i = 1;
    let v = Option::Some(&i);
    let r = v.to_result(|| "".to_string());
}