Re: Calypso: Direct and full interfacing to C++

[Kelly via Digitalmars-d-announce]

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