Re: how to achieve C's Token Pasting (##) Operator to generate variable name in D?

[Paul Backus via Digitalmars-d-learn]

On Saturday, 30 May 2020 at 22:06:30 UTC, mw wrote:
I want to generate a new symbol (new variable name) from 
existing one: e.g. in C:


$ cat t.c
--------------------------------------------
#define f(x) _##x

int main() {
  int f(x) = 3;
  return _x;
}

$ make t
cc     t.c   -o t
$ ./t
$ echo $?
3
--------------------------------------------

I wonder how to do this in D? using template / mixin? traits?

Can you show me an example?

Thanks.

enum f(string x) = "_" ~ x;

int main() {
  mixin("int ", f!"x", " = 3;");
  return _x;
}

This uses a templated [1] manifest constant [2] to generate the 
variable name at compile time, and a mixin statement [3] to 
insert the definition of `_x` into the program.

[1] https://dlang.org/spec/template.html#variable-template
[2] https://dlang.org/spec/enum.html#manifest_constants
[3] https://dlang.org/spec/statement.html#mixin-statement