Calypso: Direct and full interfacing to C++

[CraigDillabaugh via Digitalmars-d-announce]

On Tuesday, 19 May 2015 at 17:31:07 UTC, Kelly wrote:
> On Tuesday, 19 May 2015 at 16:33:00 UTC, CraigDillabaugh wrote:
>> On Tuesday, 19 May 2015 at 08:09:33 UTC, Suliman wrote:
>>> modmap (C++) "<gdalwarper>";
>>>
>>> import std.stdio;
>>>
>>> void main()
>>> {
>>> 	GDALDatasetH  hSrcDS, hDstDS;
>>> 	GDALAllRegister();
>>> 	writeln("hello");
>>> }
>>>
>>>
>>> error:
>>> app.d(7): Error: undefined identifier GDALDatasetH
>>> app.d(7): Error: undefined identifier GDALDatasetH
>>> app.d(8): Error: undefined identifier GDALAllRegister
>>
>> Perhaps you also need to include the GDAL headers, as I 
>> suspect gdalwarper doesn't define GDALDatasetH.
>
>
> Hi Craig,
>
> The method here is to actually 'import (C++) _;' since that '_' 
> will make Calypso import all the global 
> functions/variables/typedefs in gdalwarper.
>
> This works for namespaces also, so if you have a namespace in a 
> different example called MySpace, then calling 'import (C++) 
> MySpace._;' will import all the functions/variables/typedefs in 
> the namespace and make them accessible in your D file.
>
> If you just have a single class in the MySpace namespace called 
> 'myclass', and you would like to use it in your D program, then 
> use 'import (C++) MySpace.myclass;' to import it. Then 
> instantiate the class in D and use it from there.
>
> Thanks,
> Kelly

Kelly,

Just to clarify then.  If gdalwarper.h includes gdal.h and 
GDALDatasetH is declared in gdal.h, then gdal.h gets imported too?

Craig