1 files changed, 28 insertions, 0 deletions
diff --git a/src/util.rs b/src/util.rs
index fed0400..7f3c7cd 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -10,3 +10,31 @@ pub fn clamp<T: Ord>(val: T, lower: T, upper: T) -> T{
 pub trait ToJson {
 	fn to_json(&self) -> Value;
 }
+
+#[macro_export]
+macro_rules! hashmap {
+	( $($key:expr => $value:expr ),* ) => {{
+		#[allow(unused_mut)]
+		let mut h = std::collections::HashMap::new();
+		$(
+			h.insert($key, $value);
+		)*
+		h
+	}}
+}
+
+#[cfg(test)]
+mod tests {
+	use std::collections::HashMap;
+	#[test]
+	fn test_hashmap_macro() {
+		let mut h = hashmap!("hello" => 1, "world" => 2);
+		assert_eq!(h.remove("hello"), Some(1));
+		assert_eq!(h.remove("world"), Some(2));
+		assert!(h.is_empty());
+		let h2: HashMap<i32, usize> = hashmap!();
+		assert!(h2.is_empty());
+		assert_eq!(h2, HashMap::new());
+		
+	}
+}