cpp : Added documentation

cpp/data_device.cu

@@ -0,0 +1,16 @@
+#include "data.hpp"
+
+/**
+ * @brief Product of every elements in a given shape after a given offset.
+ *
+ * @param shape Shape to product over
+ * @param offset Skip offset
+ * @return Scalar product
+ */
+__host__ __device__
+size_t np::prod(const np::Shape& shape, const size_t& offset) noexcept {
+	size_t result = shape[offset];
+	for(size_t i = 1 + offset; i < shape.length; ++i)
+		result *= shape[i];
+	return result;
+}