OpenMesh
CmdOption.hh
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48 
49 #ifndef CMDOPTION
50 #define CMDOPTION
51 
52 template <typename T>
53 class CmdOption
54 {
55 public:
56 
57  typedef T value_type;
58 
59  CmdOption(const T& _val) : val_(_val), valid_(true), enabled_(false) { }
60  CmdOption() : val_(T()),valid_(false), enabled_(false) { }
61 
62  // has been set and has a value
63  bool is_valid(void) const { return valid_; }
64  bool has_value(void) const { return is_valid(); }
65 
66  // has been set and may have an value (check with is_valid())
67  bool is_enabled() const { return enabled_; }
68 
69  void enable() { enabled_ = true; }
70 
71  CmdOption& operator = ( const T& _val )
72  {
73  val_ = _val;
74  valid_=true;
75  enable();
76  return *this;
77  }
78 
79  operator T () const { return val_; }
80  // operator const T& () const { return val_; }
81 
82  operator T* () const { return is_valid() ? &val_ : NULL; }
83 
84 private:
85 
86  T val_;
87  bool valid_;
88  bool enabled_;
89 
90 private: // non-copyable
91 
92  CmdOption(const CmdOption&);
93  CmdOption& operator = ( const CmdOption& );
94 
95 };
96 
97 template < typename T >
98 std::ostream& operator << ( std::ostream& _os, CmdOption<T>& _opt )
99 {
100  _os << (T&)_opt;
101  return _os;
102 }
103 
104 #endif
Definition: CmdOption.hh:53

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