[boost] Re: ptrdiff_t and smart pointers

From: Ed Brey (brey_at_[hidden])
Date: 1999-10-05 08:57:01

Valentin Bonnard wrote:
> 
> Ed Brey wrote:
> 
> > I just noticed a minor oddity: for scoped_array and shared_array,
> > operator[] takes an
> > argument of type int.  Any reason it isn't type std::ptrdiff_t?
> 
> You do mean size_t, don't you ?
> (and yes int is incorrect)

I meant ptrdiff_t, but you are right it should be size_t.  I was
thinking ptrdiff_t because that is what's used in section 13.6/13,
where operator[] is defined for built-in types.  But I forgot that for
built-ins, the index can be negative, whereas it can't for our smart
arrays.

Indeed, std::vector uses size_type, and so should we.  Only for our
case, I don't think it is worth typedefing a size_type within
scoped_array or shared_array, so we should just use std::size_t, as
you indicated.