This alias is used to fix a tentative error in root dictionary.
The creation of a dictionary of a template class which contains another template class does not work if the first template is not also included in the dictionary using a simple type. The template class with simple type must be included in the dictionary before the complex one. Thus this header is only used to include SidesArray<> in the dictionary with a simple type (i.e. int) in order to allow the creation of the dictionary of SidesArray<std::vector<>>.
