assert_fn_lt_x

assertables

Macro assert_fn_lt_x 

Source 
macro_rules! assert_fn_lt_x {
    ($a_function:path, $a_param:expr, $b_expr:expr $(,)?) => { ... };
    ($a_function:path, $a_param:expr, $b_expr:expr, $($message:tt)+) => { ... };
    ($a_function:path, $b_expr:expr $(,)?) => { ... };
    ($a_function:path, $b_expr:expr, $($message:tt)+) => { ... };
}
Expand description

Assert a function output is less than an expression.

Pseudocode:
a_function(a) < b

  • If true, return a.

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

§Examples

use assertables::*;

let a: i8 = -1;
let b: i8 = 2;
assert_fn_lt_x!(i8::abs, a, b);

// This will panic
let a: i8 = -2;
let b: i8 = 1;
assert_fn_lt_x!(i8::abs, a, b);
// assertion failed: `assert_fn_lt_x!(a_function, a_param, b_expr)`
// https://docs.rs/assertables/…/assertables/macro.assert_fn_lt_x.html
//  a_function label: `i8::abs`,
//     a_param label: `a`,
//     a_param debug: `-2`,
//      b_expr label: `b`,
//      b_expr debug: `1`,
//                 a: `2`,
//                 b: `1`

§Module macros