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Teuchos_MatrixMarket_SymmetrizingGraphAdder.hpp
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41 
42 #ifndef __Teuchos_MatrixMarket_SymmetrizingGraphAdder_hpp
43 #define __Teuchos_MatrixMarket_SymmetrizingGraphAdder_hpp
44 
45 #include <Teuchos_as.hpp>
46 #include <Teuchos_ScalarTraits.hpp>
47 #include <string>
48 
49 
50 // Macro that marks a function as "possibly unused," in order to
51 // suppress build warnings.
52 #if ! defined(TRILINOS_UNUSED_FUNCTION)
53 # if defined(__GNUC__) || (defined(__INTEL_COMPILER) && !defined(_MSC_VER))
54 # define TRILINOS_UNUSED_FUNCTION __attribute__((__unused__))
55 # elif defined(__clang__)
56 # if __has_attribute(unused)
57 # define TRILINOS_UNUSED_FUNCTION __attribute__((__unused__))
58 # else
59 # define TRILINOS_UNUSED_FUNCTION
60 # endif // Clang has 'unused' attribute
61 # elif defined(__IBMCPP__)
62 // IBM's C++ compiler for Blue Gene/Q (V12.1) implements 'used' but not 'unused'.
63 //
64 // http://pic.dhe.ibm.com/infocenter/compbg/v121v141/index.jsp
65 # define TRILINOS_UNUSED_FUNCTION
66 # else // some other compiler
67 # define TRILINOS_UNUSED_FUNCTION
68 # endif
69 #endif // ! defined(TRILINOS_UNUSED_FUNCTION)
70 
71 
72 namespace Teuchos {
73  namespace MatrixMarket {
74 
94  template<class AdderType>
96  public:
98  typedef typename AdderType::index_type index_type;
99 
107  const std::string& symmType) :
108  adder_ (adder),
109  symmetrize_ (needsSymmetrization (symmType)),
110  skew_ (isSkew (symmType))
111  {}
112 
114  void
116  const index_type j)
117  {
118  AdderType& theAdder = *adder_;
119 
120  theAdder (i, j);
121  if (symmetrize_ && i != j) {
122  // The optional third argument (which defaults to true)
123  // specifies whether or not to count the entry against the
124  // total expected number of entries. We don't want to count
125  // this entry because it wasn't part of the original data;
126  // we inserted it because the caller doesn't want symmetric
127  // storage. The original data's total expected number of
128  // entries only counts the entries that are in the original
129  // data, not those that we insert.
130  theAdder (j, i, false);
131  }
132  }
133 
138  return adder_;
139  }
140 
141  private:
147  bool skew_;
148  };
149 
150  } // namespace MatrixMarket
151 } // namespace Teuchos
152 
153 #endif // __Teuchos_MatrixMarket_SymmetrizingGraphAdder_hpp
AdderType::index_type index_type
The type of indices of the sparse graph.
void operator()(const index_type i, const index_type j)
Add entry (i,j), and optionally symmetrize.
Teuchos::RCP< AdderType > adder_
The wrapped AdderType instance.
SymmetrizingGraphAdder(const Teuchos::RCP< AdderType > &adder, const std::string &symmType)
Constructor.
Teuchos::RCP< AdderType > getAdder() const
Persisting non-const view of the underlying adder object.
Defines basic traits for the scalar field type.
Definition of Teuchos::as, for conversions between types.
Adds entries with optional symmetry to a sparse graph.