What guarantees does D 'const' provide, compared to C++?

[Chris Cain]

Just to be abundantly clear about his point.

// v is a const vector, but holds pointers ...

*v[0] = 5; // legal in C++, illegal in D (except in constructors 
which will allow this, ATM)

Transitivity gives you more information and guarantees about what 
you can and can't do with your view. Also, if the only view of 
the data you have is that const view, it's effectively the same 
as immutable (it couldn't be changed by any valid code).