Add my own lib

Bifi · January 16, 2020, 2:09pm

Hello, community,

maybe a rather beginner’s question, but is there a possibility to attach your own libs in Haxe?

example: I have written a calculator in C++ and in Java and don’t want to rewrite it completely in Haxe. But I want to use the function “Add(x,y)” in my Haxe code.

Is it possible to include the calculator as a library depending on the compiler.

Unfortunately I have not found any beginner-friendly guides for this.

Greetings

Gama11 · January 16, 2020, 2:14pm

For Java, you can just include a .jar in compilation via --java-lib. For C++… it might be quicker to rewrite it in Haxe rather than trying to figure out how C++ externs work, depending on how much code we’re talking about and how familiar you are with C++. Plus, it would work on targets other than Java and C++ then.

Bifi · January 16, 2020, 2:39pm

First of all, thank you very much,

for my work I will probably have to find out how it works with the C++ libs …

Does anyone have any helpful links to get started ?

RealyUniqueName · January 16, 2020, 3:18pm

For C++ you can check haxe.Int64 as an example of interoperation:

github.com

HaxeFoundation/haxe/blob/8dee14b/std/cpp/_std/haxe/Int64.hx#L28


* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/

package haxe;

import haxe.Int64Helper;

@:notNull
@:include("cpp/Int64.h")
@:native("cpp::Int64Struct")
private extern class ___Int64 {
	public function get():cpp.Int64;

	@:native("_hx_int64_make")
	public static function make(high:Int32, low:Int32):__Int64;

	@:native(" ::cpp::Int64Struct")
	public static function ofInt(value:Int):__Int64;

AFAIK @:include generates respective instruction in the compiled c++ code.
@:native specifies for the Haxe compiler which name to generate for a symbol instead of its haxe name.

Bifi · January 17, 2020, 11:16am

Thank you for the example that has explained a lot.

I have another question about the directory structure:

The Int64.h has been added by installing hxcpp via haxelib and can be found at :

…HaxeToolkit\haxe\lib\hxcpp"version"\include\cpp\Int64.h

Is then used in the code by

called.

Where exactly would I store my Addieren.h to call it up in a Main.hx?
In :

haxe\lib\hxcpp"version"\include\calculator\Add.h

RealyUniqueName · January 17, 2020, 3:13pm

I guess you need to add the directory with your lib to include paths for hxcpp build tool somehow.
Maybe you can find a hint here: hxcpp/linux-toolchain.xml at master · HaxeFoundation/hxcpp · GitHub

The easiest way probably would be to just put your lib into /path/to/hxcpp/include/, but that seems to be a dirty workaround

Bifi · January 17, 2020, 3:20pm

Hello, thank you, I will definitely take a look at that.

After some searching I found this:
http://old.haxe.org/doc/cpp/ffi

Not exactly what I was looking for but it’s a start. I will take a closer look at how promising this approach is.
Greetings

RealyUniqueName · January 17, 2020, 3:53pm

AFAIK it’s an outdated approach.