On Wed, May 20, 2009 at 4:54 AM, <[email protected]> wrote:
> On the C++ side IsEmpty() is just checking if the handle internal val_
> is == 0, which is effectively equivalent to a null pointer when used
> in that context.
Be aware that they're not equivalent JS-side, though. Dereferencing an
IsEmpty() handle will crash your app, whereas dereferencing v8::Null()
must(?) work in order for toString() to work on null values.
> permanent fix, or some temporary bit of luck. (It's a little bit
> 'voodoo', which I always hate -- I prefer to know _exactly_ why it is/
> isn't working)
Amen. i've had to fight with object/call ordering several times, only
to stumble across a particular ordering which appears to work, without
understanding why other orderings don't work. :/
Back to your code:
// create new handle scope and default context
v8::HandleScope handle_scope;
v8::Persistent<v8::Context> execution_context;
v8::Persistent<v8::Value> global_object =
v8::Persistent<v8::Value>::New(v8::Handle<v8::Value>());
v8::Persistent<v8::ObjectTemplate> global_template =
v8::Persistent<v8::ObjectTemplate>::New(v8::ObjectTemplate::New());
Is Persistent<> really necessary there? The example v8 shell (off of
which i base my own code) says:
v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
...
v8::Handle<v8::Context> context = v8::Context::New(NULL, global);
...
v8::Context::Scope context_scope(context);
note the different order of creation of the Context and Global object, too.
> Much as I'd like to jump up the compiler chain so I wasn't having to
> use a custom header, we have a million-line codebase that we support
...
> to get things working there, but it's not a high priority -- it's not
> like there's anything actually wrong with VS2003. If anything VS2008
> is more irritating due to the endless warnings begging you to use
> their own 'secure' [aka: slow] STL features)
i've you're not heavily using templates, e.g. partial specializations,
then VS2003 should be okay, i would think. In my limited experience
with MS compilers, templates (which i make heavy use/abuse of) were
often problematic.
--
----- stephan beal
http://wanderinghorse.net/home/stephan/
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