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[bachmeier via Digitalmars-d]

On Saturday, 24 June 2017 at 23:05:58 UTC, jmh530 wrote:
> On Saturday, 24 June 2017 at 19:17:24 UTC, bachmeier wrote:
>>
>> Just this morning I got things working on Windows. Now that 
>> all three major platforms have support, it is as reasonable to 
>> create an R package with D functions as C, C++ or Fortran. 
>> Anyone can write up a library of D functions and put a package 
>> on Bitbucket or Github. The R user doesn't even need to know 
>> which language the functions are written in.
>
> Music to my ears! Please put something up on announce when you 
> release it.

It will probably take a while to put together a formal release. 
In the meantime, you can test it if you want. Here's an example 
that works for me on 64-bit Windows (it's obviously not the only 
way to do this).

1. Create the D file with the functions you want to call from R. 
Save this in librtest.d:

import embedr.r;
mixin(createRLibrary("rtest"));

import std.math;

export extern(C) {
   Robj transform(Robj rx) {
     auto x = RVector(rx);
	double[] y = [log(x[0]), log(x[1])];
	double result = y[0] + y[1];
	return result.robj;
   }
}

2. Download embedr to that same directory 
https://bitbucket.org/bachmeil/embedr/raw/89797bc39030a8433839119cfcdf7de6e8d7007c/inst/embedr/r.d

3. Windows requires R.lib for compilation, so I created that by 
installing the MinGW pexports.exe utility.

C:\MinGW\bin\pexports.exe R.dll > R.def

Then create the .lib using Visual Studio:

"C:\Program Files (x86)\Microsoft Visual Studio 
14.0\VC\bin\lib.exe" /def:R.def /out:R.lib /machine:x64

4. Create librtest.dll using LDC:

"C:\Users\lance\ldc64\ldc2-1.3.0-beta2-win64-msvc\bin\ldmd2.exe" 
-shared -m64 librtest.d r.d -version=inline R.lib

5. Open 64-bit R, load the library, and test it out:

dyn.load("librtest.dll")
.Call("transform", c(2.0, 3.0))

Disclaimer: I don't know much about Windows development. It would 
be nice to have others test this out and identify problems. I 
would like to figure out how to make R packages with D code on 
Windows before doing a release.