Currently, a Value which holds a ModelNode always evaluates to false, because the Value::field() ctor requires an existing value which is always null for for objects/arrays. This leads to some confusion, because myModel.objectNode is never true and trace(myModel.objectNode) always returns null. The only way to evaluate a compound member as true is through the exists-operator, but that seems like an unnecessary constraint.
The Value can also assume an Object state. Maybe we can replace Object with ModelNodePtr? Then ObjectModelNode::value() wouldn't need to return null anymore, and the ::field ctor can be removed. We can give the ModelNode interface a meta() function to unify Object and ModelNode.
Currently, a
Valuewhich holds aModelNodealways evaluates to false, because theValue::field()ctor requires an existing value which is always null for for objects/arrays. This leads to some confusion, becausemyModel.objectNodeis never true andtrace(myModel.objectNode)always returnsnull. The only way to evaluate a compound member as true is through theexists-operator, but that seems like an unnecessary constraint.The
Valuecan also assume anObjectstate. Maybe we can replaceObjectwithModelNodePtr? ThenObjectModelNode::value()wouldn't need to returnnullanymore, and the::fieldctor can be removed. We can give theModelNodeinterface ameta()function to unifyObjectandModelNode.