Inheritance

[Kagami]

Hi. Thank you for a such a great library.
I have an issue when trying to inherit Int64 class.

Code:

var inherits = require("util").inherits;
var _Int64 = require("int64-native");

function Int64() {
  Int64.super_.apply(this, arguments);
};
inherits(Int64, _Int64);

console.log(new _Int64(123).toNumber());
console.log(new Int64(123).toNumber());

Output:

$ node 1.js
123
node: /home/user/.node-gyp/0.10.33/src/node_object_wrap.h:71: void node::ObjectWrap::Wrap(v8::Handle<v8::Object>): Assertion `handle->InternalFieldCount() > 0' failed.
zsh: abort      node 1.js

I need inheritance in order to add some new methods to prototype (similar to mentioned in #9). Am I doing something wrong? Thanks.

[candu]

Reproduced issue by adding your snippet above to the unit tests. Looking into fix. In the meantime, I've confirmed that you can extend the prototype:

Int64.prototype.multiply = function(other) {
  // NOTE: this will suffer from the same integer truncation issues that
  // you get normally when manipulating JavaScript numbers.
  var a = this.toNumber(),
      b = other.toNumber();
  return new Int64(a * b);
};
expect(new Int64(2).multiply(new Int64(3))).to.equal(6);

Out of curiosity - what are you trying to add?

[Kagami]

I was trying to add .toBuffer method to the inherited class. And I'd like not to mutate the Int64 prototype itself because it may affect someone's usecase when my library (that modified the Int64 prototype) and int64-native are used at the same time (though this is unlikely but I think it's better to be safe than sorry).