Tpetra Matrix/Vector Services Version of the Day
TpetraExt_TypeStack.hpp
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00004 //          Tpetra: Templated Linear Algebra Services Package
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00041 
00042 #ifndef TPETRAEXT_TYPE_STACK_HPP
00043 #define TPETRAEXT_TYPE_STACK_HPP
00044 
00045 #include "Tpetra_ConfigDefs.hpp"
00046 #include <Teuchos_ParameterList.hpp>
00047 
00049 #define TPETRAEXT_TYPESTACK1(lbl,T1)              \
00050         typedef Tpetra::Ext::TypeStackBottom<T1>  \
00051                                              lbl;
00052 
00054 #define TPETRAEXT_TYPESTACK2(lbl,T1,T2)           \
00055         typedef Tpetra::Ext::TypeStack<T1,        \
00056                                        T2>        \
00057                                        lbl;
00058 
00060 #define TPETRAEXT_TYPESTACK3(lbl,T1,T2,T3)        \
00061         typedef Tpetra::Ext::TypeStack<T1,        \
00062                 Tpetra::Ext::TypeStack<T2,        \
00063                                        T3> >      \
00064                                        lbl;
00065 
00067 #define TPETRAEXT_TYPESTACK4(lbl,T1,T2,T3,T4)     \
00068         typedef Tpetra::Ext::TypeStack<T1,        \
00069                 Tpetra::Ext::TypeStack<T2,        \
00070                 Tpetra::Ext::TypeStack<T3,        \
00071                                        T4> > >    \
00072                                        lbl;
00073 
00074 namespace Tpetra {
00075   namespace Ext {
00076 
00078     template <class T>
00079     struct TypeStackBottom {
00080       typedef T                  type;
00081       typedef TypeStackBottom<T> next; // infinite loop; better be watching for bottom
00082       enum { bottom = true };
00083       enum { height = 1 };
00084     };
00085 
00087     template <class T, class S>
00088     struct TypeStack {
00089       typedef T                  type;
00090       typedef TypeStackBottom<S> next;
00091       enum { bottom = false };
00092       enum { height = 2 };
00093     };
00094 
00096     template <class T, class S, class SS>
00097     struct TypeStack<T, TypeStack<S,SS> > {
00098       typedef T               type;
00099       typedef TypeStack<S,SS> next;
00100       enum { bottom = false };
00101       enum { height = 1 + next::height };
00102     };
00103 
00104     template <class TS,class Init>
00105     RCP<Teuchos::ParameterList>
00106     initStackDB(Teuchos::ParameterList &pl, Init &init)
00107     {
00108       using Teuchos::ParameterList;
00109       typedef typename TS::type T;
00110       RCP<ParameterList> db = init.template initDB<T>(pl);
00111       if (! TS::bottom) {
00112         RCP<ParameterList> subdb = initStackDB<typename TS::next>(pl.sublist("child"),init);
00113         db->set("child", *subdb);
00114       }
00115       return db;
00116     }
00117 
00118   } // namespace Tpetra::Ext
00119 } // namespace Tpetra
00120 
00121 
00128 #endif // TPETRAEXT_TYPE_STACK_HPP
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