ublas_feature0009_general_indirect_containers

Add general indirect containers. Currently proxies require a preprocess member function to be present. In order to support general containers (like for example std:vector, or ublas::vector, etc.) we need to probably provide a wrapper when the indexing array is not an indirect_array.

See: http://article.gmane.org/gmane.comp.lib.boost.ublas/6978

and: http://article.gmane.org/gmane.comp.lib.boost.ublas/5468

Branch source code:

https://github.com/uBLAS/ublas/tree/ublas_feature0009_general_indirect_containers