Is this a bug in irange.hpp

[PatrickMGrace]

Lines 166 to 169 in irange.hpp:
166 reference dereference() const
167 {
168 return m_first + (m_step * m_step_size);
169 }
This looks like it is returning a reference to a temporary. Undefined behaviour?

[PatrickMGrace]

On closer inspection it seems to be OK as reference and value_type are both defined the same, i.e. Integer. However, it would be clearer if "reference" was replaced with "value_type" as the return type of the function.