D - Switch statement operator overload
- J Anderson (47/47) Dec 16 2003 This is probably a silly idea (I can't think of a practical
- Ilya Minkov (4/6) Dec 16 2003 Object has a predefined method to covert itself to hash. I think this
- J Anderson (2/8) Dec 16 2003 Does it. That's a good idea!
- J Anderson (3/17) Dec 16 2003 Actually I was just looking through phobos. Switch.d seems to do
- J Anderson (4/24) Dec 16 2003 Does it. That's a good idea!
-
Matthew Wilson
(6/32)
Dec 17 2003
A man after my own heart. Obsessed with the minutiae.
This is probably a silly idea (I can't think of a practical
application), but I'll post it anyway for comment.
What about the ability to override the switch statement for an object,
kinda like opApply for foreach.
class Obj
{
int opSwitch(Obj cmpVal, Obj [] cases)
{
...
}
}
...
Obj A = new Obj;
Obj B = new Obj;
Obj C = new Obj;
switch (A)
{
case B:
//1
break;
case C:
//2
break;
default:
//3
}
would be like typing:
switch (opSwitch(A, {A, B}))
{
case 0:
//1
break;
case 1:
//2
break;
case -1: //default
//3
break;
}
Alternative, more powerful syntax for opSwitch could be:
void opSwitch(Obj cmpVal, Obj [] cases, Obj delegate() [] solution)
{
}
Where solution is a delegate that points to the cases statement that would run
when it is called.
It might be useful, if there user wishes to define how a particular case
determines an answer
(ie what search algorithm), or for fuzzy cases (ie going for the most-likely
best choice).
It's probably a dumb idea, but I'm just putting it up for discussion anyways.
Dec 16 2003
J Anderson wrote:This is probably a silly idea (I can't think of a practical application), but I'll post it anyway for comment.Object has a predefined method to covert itself to hash. I think this should work with switch then. -eye
Dec 16 2003
Ilya Minkov wrote:J Anderson wrote:Does it. That's a good idea!This is probably a silly idea (I can't think of a practical application), but I'll post it anyway for comment.Object has a predefined method to covert itself to hash. I think this should work with switch then. -eye
Dec 16 2003
J Anderson wrote:Ilya Minkov wrote:Actually I was just looking through phobos. Switch.d seems to do something like I originally suggested.J Anderson wrote:Does it. That's a good idea!This is probably a silly idea (I can't think of a practical application), but I'll post it anyway for comment.Object has a predefined method to covert itself to hash. I think this should work with switch then. -eye
Dec 16 2003
J Anderson wrote:J Anderson wrote:Does it. That's a good idea! Should have been (just realised that I could be misinterpreted): Does it? That's a good idea!Ilya Minkov wrote:Actually I was just looking through phobos. Switch.d seems to do something like I originally suggested.J Anderson wrote:Does it. That's a good idea!This is probably a silly idea (I can't think of a practical application), but I'll post it anyway for comment.Object has a predefined method to covert itself to hash. I think this should work with switch then. -eye
Dec 16 2003
"Matthew Wilson" <matthew.hat stlsoft.dot.org> A man after my own heart. Obsessed with the minutiae. <G> Matthew P.S. btw, I think your idea is appealing, if only because it shows how other "built-in" operations might be given some under-the-covers tailorability "J Anderson" <REMOVEanderson badmama.com.au> wrote in message news:brnjq9$1mja$1 digitaldaemon.com...J Anderson wrote:J Anderson wrote:Does it. That's a good idea! Should have been (just realised that I could be misinterpreted): Does it? That's a good idea!Ilya Minkov wrote:Actually I was just looking through phobos. Switch.d seems to do something like I originally suggested.J Anderson wrote:Does it. That's a good idea!This is probably a silly idea (I can't think of a practical application), but I'll post it anyway for comment.Object has a predefined method to covert itself to hash. I think this should work with switch then. -eye
Dec 17 2003