Add some missing functions to CCMap

src/sfizz/CCMap.h

@@ -22,7 +22,10 @@ namespace sfz {
 template <class ValueType>
 class CCMap {
 public:
-    CCMap() = delete;
+    CCMap()
+        : defaultValue(ValueType {})
+    {
+    }
     /**
      * @brief Construct a new CCMap object with the specified default value.
      *
@@ -87,8 +90,17 @@ public:
     {
         return absl::c_binary_search(container, index, CCDataComparator<ValueType> {});
     }
+
+    /**
+     * @brief Container size
+     *
+     * @return size_t
+     */
+    size_t size() const noexcept { return container.size(); }
+
     typename std::vector<CCData<ValueType>>::const_iterator begin() const { return container.cbegin(); }
     typename std::vector<CCData<ValueType>>::const_iterator end() const { return container.cend(); }
+
 private:
     // typename std::vector<std::pair<int, ValueType>>::iterator begin() { return container.begin(); }
     // typename std::vector<std::pair<int, ValueType>>::iterator end() { return container.end(); }