No this isn't correct. The range algorithms are documented to work with constant and mutable references to ranges, and the range meta-functions are explicitly documented as working with const ranges. The non-mutating algorithms are explicitly listed here:

The range currently wraps pairs of iterators. It is not necessary to say if the iterator is a constant iterator. The meta-function determines the reference type. For range_reference<const Range>::type where Range, for example, a standard container will return a constant reference as you would expect.

 

Regards,

Neil Groves