Many times I need to build a type using a string. I have to resort to building the entire expression/statement using the mixin:

mixin("This is a long and complex expression where I only need to modify X")

Is there any way to do a sort of "inline mixin"?


This is a long and complex expression where I only need to modify mixin("X")

?

e.g.,

mixin("int "~name~" = 3;")

vs

int mixin(name) = 3;

(a gross simplification)



Maybe a template could handle it or is something like this impossible by D's gramar?

Dne 14.3.2017 v 18:38 Inquie via Digitalmars-d-learn napsal(a):

> Many times I need to build a type using a string. I have to resort to building the entire expression/statement using the mixin:
>
> mixin("This is a long and complex expression where I only need to modify X")
>
> Is there any way to do a sort of "inline mixin"?
>
>
> This is a long and complex expression where I only need to modify mixin("X")
>
> ?
>
> e.g.,
>
> mixin("int "~name~" = 3;")
>
> vs
>
> int mixin(name) = 3;
>
> (a gross simplification)
>
>
>
> Maybe a template could handle it or is something like this impossible by D's gramar?
>
You can combine template and mixin.

something like this:

enum Z(alias X) = "int x = " ~ X.stringof ~ ";";

void main()
{
    import std.stdio : writeln;
    mixin(Z!1);
    writeln(x);
}