laurent soulier
--- a/include/aidge/utils/Types.h
+++ b/include/aidge/utils/Types.h
+/// @details Tensor natural or mathematical coordinates could be defined as the 0-based
+/// integral coordinates.<br> A TensorImpl which is a storage for an equivalent of a
+/// multidimensionnal arrays arr[S(0)][S(1)]...[S(D-1)].<br>
+/// Then mathematical coordinates for dimension i goes from 0 to S(i)-1, where S(i) is
+/// TensorImpl size along this dimension.<br>
+/// Yet, for application purpose, it might be needed to map Tensors elements to another
+/// coordinate system. Typically, if a tensor is an extract of a larger one, its first
+/// data (at null natural coordinates) may not be at the first position within the larger
+/// one.<br>
+/// These coordinates, in an application-defined frame, are called "logical
+/// coordinates".<br>
+/// So far, Aidge supports only an offset between natural and logical coordinates.<br>
+/// @todo in a future version, different types might be used to distinguish between
+/// natural and logical coordinates, natural coordinates type being necessarily an alias
+/// for DimIdx_t.
+using Coord_t = std::make_signed_t<std::size_t>;