/*!
Creates a new \c{Object} and calls this QJSValue as a
constructor, using the created object as the `this' object and
passing \a args as arguments. If the return value from the
constructor call is an object, then that object is returned;
otherwise the default constructed object is returned.
If this QJSValue is not a function, callAsConstructor() does
nothing and returns an undefined QJSValue.
Calling this function can cause an exception to occur in the
script engine; in that case, the value that was thrown
(typically an \c{Error} object) is returned. You can call
isError() on the return value to determine whether an
exception occurred.
\sa call(), QJSEngine::newObject()
*/
QJSValue QJSValue::callAsConstructor(const QJSValueList &args)
{
FunctionObject *f = d->value.asFunctionObject();
if (!f)
return QJSValue();
ExecutionEngine *engine = d->engine;
assert(engine);
Scope scope(engine);
ScopedCallData callData(scope, args.size());
for (int i = 0; i < args.size(); ++i) {
if (!args.at(i).d->checkEngine(engine)) {
qWarning("QJSValue::callAsConstructor() failed: cannot construct function with argument created in a different engine");
return QJSValue();
}
callData->args[i] = args.at(i).d->getValue(engine);
}
ScopedValue result(scope);
QV4::ExecutionContext *ctx = engine->currentContext();
result = f->construct(callData);
if (scope.hasException())
result = ctx->catchException();
return new QJSValuePrivate(engine, result);
}
