Teuchos - Trilinos Tools Package Version of the Day
Teuchos_ConstNonconstObjectContainer.hpp
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00041 
00042 #ifndef TEUCHOS_CONST_NONCONST_OBJECT_CONTAINER_HPP
00043 #define TEUCHOS_CONST_NONCONST_OBJECT_CONTAINER_HPP
00044 
00045 #include "Teuchos_RCP.hpp"
00046 
00047 
00048 namespace Teuchos {
00049 
00050 
00274 template<class ObjType>
00275 class ConstNonconstObjectContainer {
00276 public:
00278   ConstNonconstObjectContainer()
00279     :constObj_(null),isConst_(true) {}
00281   ConstNonconstObjectContainer( const RCP<ObjType> &obj )
00282     { initialize(obj); }
00284   ConstNonconstObjectContainer( const RCP<const ObjType> &obj )
00285     { initialize(obj); }
00288   void initialize( const RCP<ObjType> &obj )
00289     {
00290       TEUCHOS_TEST_FOR_EXCEPTION(is_null(obj), NullReferenceError, "Error!");
00291       constObj_ = obj;
00292       isConst_ = false;
00293     }
00296   void initialize( const RCP<const ObjType> &obj )
00297     {
00298       TEUCHOS_TEST_FOR_EXCEPTION(is_null(obj), NullReferenceError, "Error!");
00299       constObj_ = obj; 
00300       isConst_ = true;
00301     }
00303   void uninitialize()
00304     { constObj_=null; isConst_=true; }
00306   ConstNonconstObjectContainer<ObjType>& operator=(ENull)
00307     { uninitialize(); return *this; }
00309   bool isConst() const
00310     { return isConst_; }
00325   RCP<ObjType> getNonconstObj() const
00326     {
00327       TEUCHOS_TEST_FOR_EXCEPTION(
00328         constObj_.get() && isConst_, NonconstAccessError,
00329         "Error, the object of reference type \""<<TypeNameTraits<ObjType>::name()
00330         <<"\" was given as a const-only object and non-const access is not allowed."
00331         );
00332       return rcp_const_cast<ObjType>(constObj_);
00333     }
00339   RCP<const ObjType> getConstObj() const
00340     { return constObj_; }
00342   RCP<const ObjType> operator()() const
00343     { return getConstObj(); }
00350   const ObjType* operator->() const
00351     { return &*getConstObj(); } // Does assert also!
00358   const ObjType& operator*() const
00359     { return *getConstObj(); }
00361   operator RCP<const ObjType>() const
00362     { return getConstObj(); }
00364   int count() const
00365     { return constObj_.count(); }
00366 
00367 private:
00368   RCP<const ObjType> constObj_;
00369   bool isConst_;
00370 };
00371 
00372 
00377 template<class T>
00378 bool is_null( const ConstNonconstObjectContainer<T> &p )
00379 { return is_null(p.getConstObj()); }
00380 
00381 
00386 template<class T>
00387 bool nonnull( const ConstNonconstObjectContainer<T> &p )
00388 { return nonnull(p.getConstObj()); }
00389 
00390 
00391 } // namespace Teuchos
00392 
00393 
00394 #endif // TEUCHOS_CONST_NONCONST_OBJECT_CONTAINER_HPP
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