Macro assure::assure

macro_rules! assure {
    ($x:expr $(,)?) => { ... };
    ($x:expr, $($arg:tt)+) => { ... };
}

Assure a condition is true.

If true, then return Ok(true).

Otherwise, return Err(…).

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

Examples

assure!(true);
assure!(true, "message");