From 37db22bca886d4c8cad291fe5f67351e809bb177 Mon Sep 17 00:00:00 2001
From: Andrew Kane <andrew@ankane.org>
Date: Tue, 26 Oct 2021 00:28:57 -0700
Subject: [PATCH] Added len function to Matrix

---
 CHANGELOG.md  |  4 ++++
 src/matrix.rs | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77b9078..a5d1fd7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.2.1 (unreleased)
+
+- Added `len` function to `Matrix`
+
 ## 0.2.0 (2021-10-17)
 
 - Added support for Windows
diff --git a/src/matrix.rs b/src/matrix.rs
index f9474fb..8b99cd5 100644
--- a/src/matrix.rs
+++ b/src/matrix.rs
@@ -23,6 +23,10 @@ impl Matrix {
         self.data.push(MfNode { u: row_index, v: column_index, r: value });
     }
 
+    pub fn len(&self) -> usize {
+        self.data.len()
+    }
+
     pub(crate) fn to_problem(&self) -> MfProblem {
         let data = &self.data;
         let m = data.iter().map(|x| x.u).max().unwrap_or(-1) + 1;
@@ -52,4 +56,12 @@ mod tests {
         let mut data = Matrix::with_capacity(1);
         data.push(0, 0, 1.0);
     }
+
+    #[test]
+    fn test_len() {
+        let mut data = Matrix::new();
+        assert_eq!(data.len(), 0);
+        data.push(0, 0, 1.0);
+        assert_eq!(data.len(), 1);
+    }
 }