hxcpp, externs, array access

[Dmitry Hryppa]

Hey ;)

Can someone point me to the right solution, please?

I'm writing externs for c++ library and can't find a proper way for access to the c++ class fields as to array. 

For example, in c++ code I have fields like this:

C_STRUCT aiVector3D* mVertices;
//or
unsigned int* mSomeValues;
//or
C_STRUCT aiBone** mBones
//or even
C_STRUCT aiVector3D* mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];

In c++ I can use them as this:

mVertices[i], mSomeValue[i], mBones[i]
//or
mTextureCoords[0][i];

So, the question is how to write externs for fields like that?

Firstly, I tried haxe Array and Vector. Both don't give me any result, because generated c++ in that case will look like:

//c++ side:
C_STRUCT aiVector3D* mVertices;

//haxe side:
@:native("mVertices") public var vertices:Array<Pointer<AiVector3D>>;//or Vector

//generated c++:
aiMesh->ptr->mVertices->__get(i)->ptr->x;  //And this won't compile, because it should be aiMesh->ptr->mVertices[i].x; and mVertices does not have __get() function;

So... My current solution is pretty weird:

//c++ side:
C_STRUCT aiVector3D* mVertices;

//haxe side:
@:native("mVertices") public var vertices:AiMeshVertices;

abstract AiMeshVertices(Pointer<AiVector3D>)

{

    @:arrayAccess public function get(index:Int):AiVector3D

    {

        return untyped __cpp__("this1[index]");

    }

}

@:native('aiVector3D')

@:structAccess

extern class AiVector3D

{

    public var x:Float;

    public var y:Float;

    public var z:Float;

}

And it works, but I think it is not a proper way. Any suggestions? 

Thank you :)

[Valentin]

Hey,

you should use cpp.RawPointer instead, it represents a real cpp pointer, while Pointer is a hxcpp class that wrap one.

With it you can do array access that'll be correctly generated.

`@:native("mVertices") public var vertices:RawPointer<AiVector3D>;`

`vertices[0]` => `mVertices[0]`.

--
Valentin

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[Dmitry Hryppa]

Ah, that was so simple :)

Thank you! 

вторник, 12 сентября 2017 г., 7:16:29 UTC+3 пользователь Valentin Lemière написал: