Am 07.03.2014 15:12, schrieb Daniel Gaspary:
On Fri, Mar 7, 2014 at 6:38 AM, Sven Barth <[email protected]> wrote:
Am 07.03.2014 10:13, schrieb Danny Weldon:
You can't access a C++ API.
Not yet. But it is planned for the future:
http://freepascal.org/future.var
"Linking with C++ code"
And with quite some restrictions it already works, see
$fpc/tests/test/cg/tcppcl{1,2}.pp.
Is this feature at trunk?
I haven't worked on it since some time, so the current state is even in
2.6.0.
Further examples of use.. ?
A cppclass is declared like this:
=== code begin ===
type
TTest = cppclass external 'MyCLib' name 'Test' (TParent)
procedure Test;
class procedure StaticTest;
end;
=== code end ===
Notes:
- if TParent is defined it needs to be a cppclass as well
- for sizeof to work correctly you need to specifiy the fields the same
way as in C++ (though this might still be buggy)
- cppclass instances are not implicit pointers like classes, so you need
to use "myvar^.Test" instead
Current restrictions:
- currently no namespaces supported
- currently no support for virtual metods (static methods work, instance
methods *should* work)
- no support for construction/destruction yet (so you need to have the
library instantiate the object)
- no support for multiple inheritance or virtual inheritance
- no support for operators (especially not the C++ specific ones)
In general this feature is experimental/in development, so your mileage
may vary. Bug reports are welcome though :)
Regards,
Sven
--
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