assertables

Macro assert_fn_ok_lt

source 
macro_rules! assert_fn_ok_lt {
    ($a_function:path, $a_param:expr, $b_function:path, $b_param:expr $(,)?) => { ... };
    ($a_function:path, $a_param:expr, $b_function:path, $b_param:expr, $($message:tt)+) => { ... };
    ($a_function:path, $b_function:path) => { ... };
    ($a_function:path, $b_function:path, $($message:tt)+) => { ... };
}
Expand description

Assert a function Ok(…) is less than another.

Pseudocode:
(function1(param1) ⇒ Ok(a) ⇒ a) < (function2(param2) ⇒ Ok(b) ⇒ b)

  • If true, return ().

  • Otherwise, call panic! with a message and the values of the expressions with their debug representations.

§Examples

fn f(i: i8) -> Result<String, String> {
    match i {
        0..=9 => Ok(format!("{}", i)),
        _ => Err(format!("{:?} is out of range", i)),
    }
}

let a: i8 = 1;
let b: i8 = 2;
assert_fn_ok_lt!(f, a, f, b);

let a: i8 = 2;
let b: i8 = 1;
assert_fn_ok_lt!(f, a, f, b);
//  a_function label: `f`,
//     a_param label: `a`,
//     a_param debug: `2`,
//  b_function label: `f`,
//     b_param label: `b`,
//     b_param debug: `1`,
//                 a: `\"2\"`,
//                 b: `\"1\"`

§Module macros