Hello,

I was wondering if it is possible to create a variable name with other variables. For example:

char[] left = "num1";
char[] right = "num2";

char[] num1num2 = "doesn't matter what this equals";

How would I create the variable with the values of the first two variables?

Thanks!

okibi wrote:
> Hello,
> 
> I was wondering if it is possible to create a variable name with other variables. For example:
> 
> char[] left = "num1";
> char[] right = "num2";
> 
> char[] num1num2 = "doesn't matter what this equals";
> 
> How would I create the variable with the values of the first two variables?
> 
> Thanks!

you can't unless left and right are const. If they are you have several options:

mixin("char[] "~left~right~";")

then use mixin(left~right) for the variable

another option is a total hack

template Value(T, char[] str) { T Value; }

Value!(char[], left~right) = "hello";
writef("%s\n", Value!(char[], left~right));

I haven't actually tried that usage, but you can make it work for some cases. The advantage of it is that you can do it with D v1.0

BCS Wrote:

> okibi wrote:
> > Hello,
> > 
> > I was wondering if it is possible to create a variable name with other variables. For example:
> > 
> > char[] left = "num1";
> > char[] right = "num2";
> > 
> > char[] num1num2 = "doesn't matter what this equals";
> > 
> > How would I create the variable with the values of the first two variables?
> > 
> > Thanks!
> 
> you can't unless left and right are const. If they are you have several options:
> 
> mixin("char[] "~left~right~";")
> 
> then use mixin(left~right) for the variable
> 
> another option is a total hack
> 
> template Value(T, char[] str) { T Value; }
> 
> Value!(char[], left~right) = "hello";
> writef("%s\n", Value!(char[], left~right));
> 
> I haven't actually tried that usage, but you can make it work for some cases. The advantage of it is that you can do it with D v1.0

They won't be const so that first method is out. I'll give the second method a go and see if it works.

Thanks!

okibi wrote:
> BCS Wrote:
> 
> 
>>okibi wrote:
>>
>>>Hello,
>>>
>>>I was wondering if it is possible to create a variable name with other variables. For example:
>>>
>>>char[] left = "num1";
>>>char[] right = "num2";
>>>
>>>char[] num1num2 = "doesn't matter what this equals";
>>>
>>>How would I create the variable with the values of the first two variables?
>>>
>>>Thanks!
>>
>>you can't unless left and right are const. If they are you have several options:
>>
>>mixin("char[] "~left~right~";")
>>
>>then use mixin(left~right) for the variable
>>
>>another option is a total hack
>>
>>template Value(T, char[] str) { T Value; }
>>
>>Value!(char[], left~right) = "hello";
>>writef("%s\n", Value!(char[], left~right));
>>
>>I haven't actually tried that usage, but you can make it work for some cases. The advantage of it is that you can do it with D v1.0
> 
> 
> They won't be const so that first method is out. I'll give the second method a go and see if it works.
> 
> Thanks!

if they aren't const than the only option is #3

char[][char[]] vars;

vars[left~right] = something;

but that give you a hash lookup for every access (modulo optimizations).