changed MakeRuntimeObject() to return a shared_ptr<Object> instead of shared_ptr<C>

BrainScript/BrainScriptEvaluator.cpp

@@ -368,7 +368,7 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
     }
     // factory function for ComputationNodes
     template<>
-    shared_ptr<ComputationNode> MakeRuntimeObject<ComputationNode>(const IConfigRecordPtr configp)
+    shared_ptr<Object> MakeRuntimeObject<ComputationNode>(const IConfigRecordPtr configp)
     {
         let & config = *configp;
         let classIdParam = config[L"class"];
@@ -412,7 +412,7 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
     // The difference to the above is that the children are not resolved immediately but later during network connection.
     // This takes the record as a shared_ptr so that we can keep it inside a lambda.
     template<>
-    shared_ptr<RecurrentComputationNode> MakeRuntimeObject<RecurrentComputationNode>(const IConfigRecordPtr configp)
+    shared_ptr<Object> MakeRuntimeObject<RecurrentComputationNode>(const IConfigRecordPtr configp)
     {
         let & config = *configp;
         let classIdParam = config[L"class"];
@@ -544,12 +544,12 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
         {
             return MakeRuntimeObject<C>(config);
         };
-        rtInfo.IsConfigRecord = is_base_of<IConfigRecord, C>::value;
+        rtInfo.isConfigRecord = is_base_of<IConfigRecord, C>::value;
         return rtInfo;
     }
     // note: don't forget to duplicate the above when we move this out
 
-#if 0
+#if 1
     // get information about configurable runtime types
     const ConfigurableRuntimeType * FindExternalRuntimeTypeInfo(const wstring & typeId)
     {
@@ -897,6 +897,8 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
         else if (e->op == L"^")   return MakePrimitiveConfigValuePtr(left ^  right, e->location, exprPath);
         else return CompOp<bool>(e, left, right, exprPath);
     };
+    // NodeOps handle the magic CNTK types, that is, infix operations between ComputeNode objects.
+    // TODO: rename to MagicOps
     static ConfigValuePtr NodeOp(ExpressionPtr e, ConfigValuePtr leftVal, ConfigValuePtr rightVal, const wstring & exprPath)
     {
         if (rightVal.Is<Double>())          // ComputeNode * scalar
@@ -943,7 +945,7 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
     // This lists all infix operators with lambdas for evaluating them.
     static map<wstring, InfixOps> infixOps =
     {
-        // NumbersOp StringsOp BoolOp ComputeNodeOp DictOp
+        // NumbersOp StringsOp BoolOp ComputeNodeOp DictOp  TODO: this comment is incomplete
         { L"*",  InfixOps(NumOp, BadOp, BadOp,  NodeOp, NodeOp, NodeOp, BadOp) },
         { L"/",  InfixOps(NumOp, BadOp, BadOp,  BadOp,  BadOp,  BadOp,  BadOp) },
         { L".*", InfixOps(BadOp, BadOp, BadOp,  NodeOp, BadOp,  BadOp,  BadOp) },
@@ -1019,7 +1021,7 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS {
                     Fail(L"unknown runtime type " + e->id, e->location);
                 // form the config record
                 let dictExpr = e->args[0];
-                let argsExprPath = rtInfo->IsConfigRecord ? L"" : exprPath;   // reset expr-name path if object exposes a dictionary
+                let argsExprPath = rtInfo->isConfigRecord ? L"" : exprPath;   // reset expr-name path if object exposes a dictionary
                 let value = ConfigValuePtr(rtInfo->construct(ConfigRecordFromDictExpression(dictExpr, scope, argsExprPath)), e->location, exprPath); // this constructs it
                 // if object has a name, we set it
                 let valueWithName = dynamic_cast<HasName*>(value.get());

BrainScript/BrainScriptEvaluator.h

@@ -271,7 +271,7 @@ namespace Microsoft{ namespace MSR { namespace CNTK { namespace BS {
     // create a runtime object from its type --general case
     // There can be specializations of this that instantiate objects that do not take ConfigRecords or involve mapping like ComputationNode.
     template<typename C>
-    shared_ptr<C> MakeRuntimeObject(const IConfigRecordPtr config)
+    shared_ptr<Object> MakeRuntimeObject(const IConfigRecordPtr config)
     {
         return make_shared<C>(config);
     }

BrainScript/BrainScriptObjects.h

@@ -90,7 +90,7 @@ namespace Microsoft { namespace MSR { namespace CNTK { namespace BS { // or BS::
     //  - a bool saying whether T derives from IConfigRecord
     struct ConfigurableRuntimeType
     {
-        bool IsConfigRecord;        // exposes IConfigRecord  --in this case the expression name is computed differently, namely relative to this item
+        bool isConfigRecord;        // exposes IConfigRecord  --in this case the expression name is computed differently, namely relative to this item
         function<shared_ptr<Object>(const IConfigRecordPtr)> construct; // lambda to construct an object of this class
     };