macro_rules! assert_fn_ok_lt_expr_as_result { ($a_function:path, $a_param:expr, $b_expr:expr $(,)?) => { ... }; ($a_function:path, $b_expr:expr $(,)?) => { ... }; }
Expand description
Assert a function Ok(…) is less than an expression.
Pseudocode:
(function1(param1) ⇒ Ok(a) ⇒ a) < expr
-
If true, return Result
Ok(())
. -
Otherwise, return Result
Err
with a diagnostic message.
§Examples
This macro provides the same statements as assert_
,
except this macro returns a Result, rather than doing a panic.
This macro is useful for runtime checks, such as checking parameters, or sanitizing inputs, or handling different results in different ways.