Add counter type

src/lib.rs

@@ -1 +1,2 @@
 pub mod macros;
+pub mod types;

src/types.rs

@@ -0,0 +1,21 @@
+#[derive(Debug)]
+pub struct CounterU32 {
+    v: u32,
+}
+
+impl CounterU32 {
+    #[inline(always)]
+    pub fn new() -> Self {
+        Self { v: 0 }
+    }
+
+    #[inline(always)]
+    pub fn inc(&mut self) {
+        self.v += 1
+    }
+
+    #[inline(always)]
+    pub fn ingest(&mut self, rhs: Self) {
+        self.v += rhs.v
+    }
+}