Clean way to access node's typed arrays.

gistfile1.cpp

template<class C> class TypedArrayWrapper {
 private:
  Local<Object> array;
  Handle<Object> buffer;
  int offset;
 public:
  TypedArrayWrapper(const Local<Value>& arg) :
   array(arg->ToObject()),
    buffer(array->Get(String::New("buffer"))->ToObject()),
    offset(array->Get(String::New("byteOffset"))->Int32Value()) {
  }

  inline __attribute__((always_inline)) C* const pointer() {
    return (C*) &((char*) buffer->GetIndexedPropertiesExternalArrayData())[offset];
  }

  inline __attribute__((always_inline)) int length() {
    return array->Get(String::New("length"))->Uint32Value();
  }
};

Handle<Value> openvg::SetFV(const Arguments& args) {
  HandleScope scope;

  CheckArgs2(setFV, type, Int32, Float32Array, Object);

  TypedArrayWrapper<VGfloat> values(args[1]);

  vgSetfv((VGParamType) args[0]->Int32Value(),
          values.length(),
          values.pointer());

  return Undefined();
}