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Re: [PATCH] [PR c++/85437] accept static_casted ptrmem in constexpr
On Fri, Apr 20, 2018, 8:28 AM Nathan Sidwell <nathan@acm.org> wrote:
> On 04/18/2018 01:07 AM, Jason Merrill wrote:
> > I wonder if it would work to use CONVERT_EXPR for reinterpret_cast.
>
> That's kind of the wrong way round, isn't it? NOP_EXPRs are for things
> that don't generate code, which a reinterpret_cast is. static_cast adds
> a constant, which is only zero for conversions through the primary base
> (or suitably placed empty base). CONVERT_EXPR would seem more natural
> there?
>
Any time we need an actual adjustment, there will be a PLUS_EXPR. The issue
is somehow distinguishing between a reinterpret_cast and one of the many
other sources of NOP_EXPR.
I'm not really clear on what the difference between NOP and CONVERT is
supposed to be, anyway...
Jason