Hi,

Is something like this is doable ?

-------------------------------------------------------------------
// all compile time
MapperGen.Create!(A, B)
    .Map!("p1", "p2")
    .Map!("myprop", "otherprop")
    .Gen();

// The code above must generate something like
//
// class Mapper {
//     B map(A value) {
//         B ret = new B();
//         ret.p1 = value.p2;
//         ret.myprop = p2.otherprop;
//         return ret;
//     }
// }

// runtime use
auto b = new Mapper().map(new A());
-------------------------------------------------------------------

I can't figure out how to concatenate string at runtime and the mixin the resulting string?.


Thanks in advance !

On 11/16/18 12:10 PM, boolangery wrote:
> Hi,
> 
> Is something like this is doable ?
> 
> -------------------------------------------------------------------
> // all compile time
> MapperGen.Create!(A, B)
>      .Map!("p1", "p2")
>      .Map!("myprop", "otherprop")
>      .Gen();
> 
> // The code above must generate something like
> //
> // class Mapper {
> //     B map(A value) {
> //         B ret = new B();
> //         ret.p1 = value.p2;
> //         ret.myprop = p2.otherprop;
> //         return ret;
> //     }
> // }
> 
> // runtime use
> auto b = new Mapper().map(new A());
> -------------------------------------------------------------------
> 
> I can't figure out how to concatenate string at runtime and the mixin the resulting string?.

I'm not understanding what you are trying to do, but to answer your question, you can only mixin a string generated at compile time.

However, you can concatenate a string at runtime inside a CTFE-able function, and then mixin the result.

Example:

string foo(string[] fields...)
{
   string result = "struct Foo {";
   foreach(f; fields)
       result ~= "int " ~ f ~ ";";
   return result ~ "}";
}

mixin(foo()); // generate the struct

-Steve