macro_rules! assert_fn_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 output is less than another.
Pseudocode:
function1(a) < function2(b)
-
If true, return
()
. -
Otherwise, call
panic!
with a message and the values of the expressions with their debug representations.
§Examples
let a: i8 = 1;
let b: i8 = -2;
assert_fn_lt!(i8::abs, a, i8::abs, b);
let a: i8 = -2;
let b: i8 = 1;
assert_fn_lt!(i8::abs, a, i8::abs, b);
// assertion failed: `assert_fn_lt!(a_function, a_param, b_function, b_param)`
// https://docs.rs/assertables/8.9.0/assertables/macro.assert_fn_lt.html
// a_function label: `i8::abs`,
// a_param label: `a`,
// a_param debug: `-2`,
// b_function label: `i8::abs`,
// b_param label: `b`,
// b_param debug: `1`,
// a: `2`,
// b: `1`