Macro assertables::assert_fn_lt_expr

source · 
macro_rules! assert_fn_lt_expr {
    ($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.

  • 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_expr!(i8::abs, a, b);

let a: i8 = -2;
let b: i8 = 1;
assert_fn_lt_expr!(i8::abs, a, b);
// assertion failed: `assert_fn_lt_expr!(a_function, a_param, b_expr)`
//  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