1 files changed, 42 insertions, 0 deletions
diff --git a/src/statistics/mechanics.rs b/src/statistics/mechanics.rs
new file mode 100644
index 0000000..5a16204
--- /dev/null
+++ b/src/statistics/mechanics.rs
@@ -0,0 +1,42 @@
+use super::gamedata::Mechanic;
+use super::math::{Monoid, RecordFunc, Semigroup};
+
+use std::fmt;
+
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Counter(u32);
+
+impl Semigroup for Counter {
+    #[inline]
+    fn combine(&self, other: &Counter) -> Counter {
+        Counter(self.0 + other.0)
+    }
+}
+
+impl Monoid for Counter {
+    #[inline]
+    fn mempty() -> Counter {
+        Counter(0)
+    }
+}
+
+#[derive(Clone, Default)]
+pub struct MechanicLog {
+    inner: RecordFunc<u64, (&'static Mechanic, u64), Counter>,
+}
+
+impl MechanicLog {
+    pub fn increase(&mut self, time: u64, mechanic: &'static Mechanic, agent: u64) {
+        self.inner.insert(time, (mechanic, agent), Counter(1));
+    }
+
+    pub fn count<F: FnMut(&'static Mechanic, u64) -> bool>(&self, mut filter: F) -> u32 {
+        self.inner.tally_only(|(a, b)| filter(a, *b)).0
+    }
+}
+
+impl fmt::Debug for MechanicLog {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "MechanicLog {{ ... }}")
+    }
+}