Macro assertables::assure_fn_err_string_ge

macro_rules! assure_fn_err_string_ge {
    ($function:path, $left:expr, $right:expr $(,)?) => { ... };
    ($function:path, $left:expr, $right:expr, $($arg:tt)+) => { ... };
}

Assure one function ok() is greater than or equal to another function ok().

• When true, return Ok(true).

• When false, return Ok(false).

• Otherwise, return Err with a message and the values of the expressions with their debug representations.

Examples

fn f(i: i32) -> Result<bool, String> { Err(format!("{:?}", i)) }
let x: Result<bool, String> = assure_fn_err_string_ge!(f, 2, 1);
//-> Ok(true)

fn f(i: i32) -> Result<bool, String> { Err(format!("{:?}", i)) }
let x: Result<bool, String> = assure_fn_err_string_ge!(f, 1, 2);
//-> Ok(false)

This macro has a second form where a custom message can be provided.