Macro claims::assert_ready_eq

macro_rules! assert_ready_eq {
    ($cond:expr, $expected:expr,) => { ... };
    ($cond:expr, $expected:expr) => { ... };
    ($cond:expr, $expected:expr, $($arg:tt)+) => { ... };
}

Asserts that left expression returns [Poll::Ready(T)] variant and its value of T type equals to the right expression.

This macro is available for Rust 1.36+.

Uses

Assertions are always checked in both debug and release builds, and cannot be disabled. See debug_assert_ready_eq! for assertions that are not enabled in release builds by default.

Custom messages

This macro has a second form, where a custom panic message can be provided with or without arguments for formatting. See std::fmt for syntax for this form.

Examples

let res: Poll<Result<i32, ()>> = Poll::Ready(Ok(42));

assert_ready_eq!(res, Ok(42));

Value of T type from the Poll::Ready(T) will also be returned from this macro call:

let res: Poll<Result<i32, ()>> = Poll::Ready(Ok(42));

let value = assert_ready_eq!(res, Ok(42));
assert_eq!(value, Ok(42));

Poll::Pending variant will cause panic:

let res: Poll<Result<i32, ()>> = Poll::Pending;

assert_ready_eq!(res, Ok(42));  // Will panic