On Wednesday, 8 December 2021 at 17:29:19 UTC, H. S. Teoh wrote:
On Wed, Dec 08, 2021 at 05:19:32PM +0000, Ben Jones via
Digitalmars-d-learn wrote:
I'm trying to use a property member of a struct as a template
alias parameter and I don't really understand how to fix the
error message I'm seeing (I also tried the simpler case of a
plain struct member, and that didn't work either). Is what
I'm trying to do possible? It seems like maybe I'd have to
pass s as a runtime parameter to get it to work?
It might help if you elaborate a bit more on what exactly
you're trying to achieve here. Why can't you just pass the
value of the field to the function as a runtime parameter, for
example, which would be the usual way of doing it? Is there
something specific you're trying to achieve here that requires
using a template parameter?
T
It's a CPU simulator and the function needs to operate on half of
a register (the CPU has 16 bit AF register, but I want to operate
on A). I've implemented the "A" part of the register as a pair
of property functions:
```
@property ubyte a() const { return getHigh!af; }
@property ubyte a(ubyte val) { return setHigh!af(val); }
```
There are CPU instructions for each of the combined (AF, BC, DE,
etc) and half(A, B, C, D, E, etc) registers, so I think either
the half registers or the full registers would have to be
implemented as property functions (from my reading of the spec,
using unions seemed like technically it would be UB?)
Basically I want to write one template for the operation
(increment, load, etc), and then instantiate it for each register
(inc a, inc b, inc c, load a, load b, etc)
