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CmdOption.hh
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40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
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
CmdOption
Definition: CmdOption.hh:53