[v8-users] Re: calling functions with variable amount of arguments

[Flier Lu]

The Function class has provided the NewInstance which support variable
amount of arguments

class V8EXPORT Function : public Object {
 public:
  Local<Object> NewInstance() const;
  Local<Object> NewInstance(int argc, Handle<Value> argv[]) const;
  ...
};

You could fill your actual arguments in a array, and pass the length
and pointer to the second one.

Here is some sample code in pyv8, <http://code.google.com/p/pyv8/
source/browse/trunk/src/Wrapper.cpp#1039>

  std::vector< v8::Handle<v8::Value> > params(::PyList_Size(args.ptr
()));

  for (size_t i=0; i<params.size(); i++)
  {
    params[i] = CPythonObject::Wrap(args[i]);
  }

  v8::Handle<v8::Value> result;

  Py_BEGIN_ALLOW_THREADS

  result = func->Call(
    self.IsEmpty() ? v8::Context::GetCurrent()->Global() : self,
    params.size(), params.empty() ? NULL : &params[0]);

  Py_END_ALLOW_THREADS


On 1月18日, 下午4时18分, ondras <ondrej.z...@gmail.com> wrote:
> Hi,
>
> I have some troubles implementing a js class/function which can fix
> itself when not called with "new". What is my aim:
>
> ...
> if (!args.IsConstructCall()) {
>   return args.Callee()->NewInstance(args.Length(), ???);}
>
> ...
>
> However, I do not want this routine to be dependent on the actual
> number of arguments passed. Can you please provide some help on this
> topic?
>
> Thanks,
> Ondrej

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