[−][src]Macro claim::assert_ready
Asserts that expression returns Poll::Ready(T)
variant.
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!
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::Ready(42); assert_ready!(res);
Value of T
type from the Poll::Ready(T)
will also be returned from this macro call:
let res = Poll::Ready(42); let value = assert_ready!(res); assert_eq!(value, 42);
Poll::Pending
variant will cause panic:
let res = Poll::Pending; assert_ready!(res); // Will panic