Slice

Author: pschatzmann

src/AudioBasic/Collections/Slice.h

@@ -0,0 +1,56 @@
+#pragma once
+#include <stddef.h>
+#include <stdint.h>
+
+namespace audio_tools {
+
+/**
+ * @brief Helps to split up a big memory array into smaller slices. There are no
+ * additinal heap allocations!
+ * @ingroup collections
+ * @author Phil Schatzmann
+ */
+template <class T> 
+class Slice {
+ public:
+  Slice(T* start, size_t len) {
+    this->start = start;
+    this->len = len;
+  }
+
+  /// Returns the data
+  T* data() { return start; }
+
+  /// Returns the (result) data size in bytes
+  size_t size() { return len; }
+
+  /// Returns the number of slices
+  size_t slices(int sliceSize){
+    int result = len / sliceSize;
+    return len % sliceSize == 0 ? result : result+1;
+  }
+
+  operator bool() { return len > 0; }
+
+  /// Returns the slice at the indicated index;
+  Slice slice(int sliceSize, int idx) {
+    int start_pos = idx * sliceSize;
+    int end_pos = start_pos + sliceSize;
+    if (end_pos > len) {
+      end_pos = len;
+    }
+
+    if (start_pos < len) {
+      assert(start!=nullptr);
+      return Slice(start + start_pos, end_pos - start_pos);
+    } else {
+      return Slice(nullptr, 0);
+    }
+  }
+
+ protected:
+  T* start = nullptr;
+  size_t len = 0;
+};
+
+}  // namespace audio_tools