Problem with compound assignment operator += in class fields

[GuilHartt]

The += operator does not update the value when used in class fields. However, direct assignment such as this.pos.x = this.pos.x + 1 works correctly.

Code exemple:

class Test {
    private var pos:Vector2;

    public function new(x, y:Single) {
        this.pos = new Vector2(x, y);
    }

    public function update():Void {
        this.pos.x += 1; // Doesn't work
        this.pos.x = this.pos.x + 1; // Work
    }
}

[Dimous]

Hey!
Just an observation.

void Test_obj::update(){
	cpp::Struct<  Vector2 > fh = this->pos; // it's a copy, if only it was a reference -- cpp::Struct<  Vector2 >& fh, it would work
	fh->x = (fh->x + 1);

	this->pos->x = (this->pos->x + 1);
}

All that remains is to find a way to make the transpiler generate it right.

[MAJigsaw77]

I need to think about a solution hmm

[MAJigsaw77]

As of now, the reassignment seems to be the only way to mave it working, until there's a proper way to use references

[Aidan63]

This is one of those undocumented pitfalls when using cpp.Struct and similar, there's no real way around it. I do have new extern techniques on the way which aims to provide the same functionality and address theses sorts of issues.

HaxeFoundation/haxe#11981