RPL Global User-defined Functions -- 4-29-2009 (a)
http://cadswes2.colorado.edu/~philw/2009/GlobalRplFunctions/

Invocation of Global RPL Functions: support specific to the caller's
RPL Application type.  This is important because Global RplObjs have their
own application type (GLOBAL), but when called from, for example, a RuleSet 
or a SeriesSlot-with-RplExpression, values related to, for example, the 
"current timestep" need to be interpreted according to the caller's 
RPL application.

  See changes in these four classes: RplExpression, FuncCallExpr, 
  RplObj and ValueConstraint.  A "dynamic" Rpl Application Type 
  override is governed by static settings in the RplExpression class,
  managed from FuncCallExpr::evaluate().

-------------------------------
RplExpression/RplExpression.hpp
RplExpression/RplExpression.cpp
-------------------------------

Revised RplExpression RplApplication::Type data members:

  RplApplication::Type _ownerAppType;               // was 'appType'
  static RplApplication::Type _dynamicAppType;      // NEW
  static int _dynamicAppTypeSemaphore;              // NEW

Revised RplExpression RplApplication::Type methods:

  // RplObj "Owner"-based RplApplication Type
  inline RplApplication::Type getOwnerAppType() const;
  void setApplicationType (RplApplication::Type newAppType);

  // Dynamic override of RplApplication Type, used for "dynamically scoped"
  // override of Global RPL functions using the _caller's_ application type.
  static RplApplication::Type getDynamicAppType();
  static bool usingDynamicAppType();

  static RplApplication::Type  // returns current value to save (cachedType)
     startDynamicAppTypeOverride (RplApplication::Type overrideType);
  static void endDynamicAppTypeOverride (RplApplication::Type cachedType);

  // Switched (Owner vs. Dynamic) RplApplication Types
  inline RplApplication::Type getApplicationType() const; // owner or dynamic
  inline RplApplication* getApplication() const;          // owner or dynamic

------------------------------
RplExpression/FuncCallExpr.cpp
------------------------------

In FuncCallExpr::evaluate(), if the function to be called is Global, 
override with the "active" (dynamic or owner) application type of 
'this' RplExpression.

  const bool functionToCallIsGlobal = functionPtr->rplObjIsGlobal();
  if (functionToCallIsGlobal)
  {
     // ----- Start Dynamic Application Type Override -----
     const RplApplication::Type overrideType (getApplicationType());
     const RplApplication::Type saveType =
        RplExpression::startDynamicAppTypeOverride (overrideType);

     // Evaluate the function.
     functionPtr->evaluate( actualArgs, result, slotsAccessed );

     // ----- End Dynamic Application Type Override -----
     RplExpression::endDynamicAppTypeOverride (saveType);
  }
  else // (not functionToCallIsGlobal)
  {
     // Evaluate the function.
     functionPtr->evaluate( actualArgs, result, slotsAccessed );
  }

--------------
Rpl/RplObj.cpp
Rpl/RplObj.hpp
Rpl/ValueConstraint.cpp
Rpl/ValueConstraint.hpp
--------------

Revised RplObj and ValueConstraint RplApplication::Type DATA MEMBERS:

  OLD:  RplApplication::Type _appType;
  NEW:  RplApplication::Type _ownerAppType;

Revised RplObj and ValueConstraint RplApplication::Type METHODS:
(Comment text is for RplObj change, similar for ValueConstraint):

  // RplObj "Owner"-based RplApplication Type
  inline RplApplication::Type getOwnerAppType() const;
  void setApplicationType (RplApplication::Type newAppType);

  // Switched (Owner vs. Dynamic) RplApplication Types.
  // If the static RplExpression dynamic application type override state
  // is active, these methods return that mechanisms's dynamic applicatieon
  // type instead of the local RplObj "Owner"-based application type.
  inline RplApplication::Type getApplicationType() const; // owner or dynamic
  inline RplApplication* getApplication() const;          // owner or dynamic

------------------------
QtRpl/RplBaseDlg.cpp
QtRpl/RplBlockDlg.cpp
QtRpl/RplDlgMgr.cpp
QtRpl/RplFrame.cpp
QtRpl/RplFunctionDlg.cpp
QtRpl/RplGroupDlg.cpp
QtRpl/RplListView.cpp
QtRpl/RplSetDlg.cpp
------------------------

For retrieving the RplObj RplApplication::Type, use 'getOwnerAppType()'
instead of 'getApplicationType()'.  The latter incorporates the 
dynamic RPL application type override, if active, which isn't what's 
wanted in the GUI. 

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