Question

how can the following declaration be expressed with const first (without typedef)?

double* const (&data)[6]
// ?? const double* (&data)[6] // incorrect, elements, not reference, are const

thank you

Answer 1

You can’t do it.

According to the C++ Standard 8.3.2/1:

Cv-qualified references are ill-formed except
when the cv-qualifiers are introduced through the use of a typedef (7.1.3) or of a template type argument
(14.3), in which case the cv-qualifiers are ignored.