• okibi (7/7) Apr 23 2007 Hello,
• BCS (11/23) Apr 23 2007 you can't unless left and right are const. If they are you have several
• okibi (3/33) Apr 23 2007 They won't be const so that first method is out. I'll give the second me...
• BCS (5/44) Apr 23 2007 if they aren't const than the only option is #3

okibi <okibi ratedo.com> writes:

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!

BCS <BCS pathlink.com> writes:

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

okibi <okibi ratedo.com> writes:

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!

BCS <BCS pathlink.com> writes:

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!



char[][char[]] vars;

vars[left~right] = something;

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