conditionalstorage.hh
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28 #ifndef EWOMS_CONDITIONAL_STORAGE_HH
29 #define EWOMS_CONDITIONAL_STORAGE_HH
30 
31 #include <opm/common/ErrorMacros.hpp>
32 #include <opm/common/Exceptions.hpp>
33 
34 #include <utility>
35 
36 namespace Ewoms {
46 template <bool cond, class T>
48 {
49 public:
50  typedef T type;
51  static const bool value = cond;
52 
54  {}
55 
56  ConditionalStorage(const T& t)
57  : data_(t)
58  {};
59 
60  ConditionalStorage(T&& t)
61  : data_(std::move(t))
62  {};
63 
64  const T& operator*() const
65  { return data_; }
66  T& operator*()
67  { return data_; }
68 
69  const T* operator->() const
70  { return &data_; }
71  T* operator->()
72  { return &data_; }
73 
74 private:
75  T data_;
76 };
77 
78 template <class T>
79 class ConditionalStorage<false, T>
80 {
81 public:
82  typedef T type;
83  static const bool value = false;
84 
86  {}
87 
88  ConditionalStorage(const T&)
89  {};
90 
91  const T& operator*() const
92  { OPM_THROW(std::logic_error, "data member deactivated"); }
93  T& operator*()
94  { OPM_THROW(std::logic_error, "data member deactivated"); }
95 
96  const T* operator->() const
97  { OPM_THROW(std::logic_error, "data member deactivated"); }
98  T* operator->()
99  { OPM_THROW(std::logic_error, "data member deactivated"); }
100 };
101 
102 } // namespace Ewoms
103 
104 #endif
Definition: baseauxiliarymodule.hh:37
A simple class which only stores a given member attribute if a boolean condition is true...
Definition: conditionalstorage.hh:47