From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 7 Mar 2021 22:16:24 +0000 (+0000)
Subject: utils: provide matches_doesnot
X-Git-Tag: otter-0.4.0~233
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=8b69a174a2b309ea254b32a6c234c09308aacb52;p=otter.git

utils: provide matches_doesnot

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/src/utils.rs b/src/utils.rs
index a7ab4504..6169c162 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -353,6 +353,16 @@ impl<T,U,E,F> IteratorExt<U,E,F> for T where
   }
 }
 
+#[macro_export]
+macro_rules! matches_doesnot {
+  ($v:expr; $y:pat, ! $n:pat) => { match $v { $y => true, $n => false } }
+}
+
+#[test]
+fn matches_doesnot_test() {
+  assert!( matches_doesnot!( Some(42); Some(_), ! None) );
+}
+
 #[macro_export]
 macro_rules! dbgc {
     // NOTE: We cannot use `concat!` to make a static string as a format argument