Defining constant values in struct

[jklp via Digitalmars-d-learn]

On Tuesday, 16 June 2015 at 21:17:37 UTC, tcak wrote:
> As far as I known, when I define a string with enum and it is 
> used at different parts of code, that string is repeated again 
> and again in executable file instead of passing a pointer to 
> string. So, using enum with string doesn't seem like a good 
> idea.
>
> Hence, I defined string as const to make it belong to struct 
> itself instead of instances, but it comes with 'need `this` for 
> ...' error. This indicates that the string doesn't belong to 
> struct itself actually.
>
> Because there is nothing like namespace in D, I used a 
> sub-struct.
>
> [code]
> struct TableSchema{
> 	const string TABLE = "users";
>
> 	struct FieldTypes{
> 		const string ID = "BIGINT";
> 	}
>
> 	const string CREATESQL = "... id " ~ FieldTypes.ID ~ "...";
> }
> [/code]
>
>
> But compiler doesn't allow me to access FieldTypes.ID. It says 
> that it needs `this`. I tried with `static shared`, used 
> `class` instead of `struct` etc. But couldn't have come up with 
> a nice solution.

Do i miss a detail in your requirement ?

---
struct TableSchema{
	const string TABLE = "users";

	struct FieldTypes{
		static const string ID = "BIGINT";
	}

	const string CREATESQL = "... id " ~ FieldTypes.ID ~ "...";
}
---

because this works.