adding front and back

2019-11-19 16:03:55 -08:00
parent 7e99e76c97
commit 7004ef506c
2 changed files with 27 additions and 1 deletions
@@ -512,6 +512,19 @@ public:

    constexpr reference at(index_type idx) const { return this->operator[](idx); }
    constexpr reference operator()(index_type idx) const { return this->operator[](idx); }
+
+    constexpr reference front() const
+    {
+        Expects(size() > 0);
+        return data()[0];
+    }
+
+    constexpr reference back() const
+    {
+        Expects(size() > 0);
+        return data()[size() - 1];
+    }
+
    constexpr pointer data() const noexcept { return storage_.data(); }

    // [span.iter], span iterator support