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CmdOption.hh
1 /*===========================================================================*\
2 * *
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33 \*===========================================================================*/
34
35 /*===========================================================================*\
36 * *
37 * $Revision: 736 $ *
38 * $Date: 2012-10-08 09:30:49 +0200 (Mo, 08 Okt 2012) $ *
39 * *
40 \*===========================================================================*/
41
42 #ifndef CMDOPTION
43 #define CMDOPTION
44
45 template <typename T>
46 class CmdOption
47 {
48 public:
49
50 typedef T value_type;
51
52 CmdOption(const T& _val) : val_(_val), valid_(true), enabled_(false) { }
53 CmdOption() : val_(T()),valid_(false), enabled_(false) { }
54
55 // has been set and has a value
56 bool is_valid(void) const { return valid_; }
57 bool has_value(void) const { return is_valid(); }
58
59 // has been set and may have an value (check with is_valid())
60 bool is_enabled() const { return enabled_; }
61
62 void enable() { enabled_ = true; }
63
64 CmdOption& operator = ( const T& _val )
65 {
66 val_ = _val;
67 valid_=true;
68 enable();
69 return *this;
70 }
71
72 operator T () const { return val_; }
73 // operator const T& () const { return val_; }
74
75 operator T* () const { return is_valid() ? &val_ : NULL; }
76
77 private:
78
79 T val_;
80 bool valid_;
81 bool enabled_;
82
83 private: // non-copyable
84
85 CmdOption(const CmdOption&);
86 CmdOption& operator = ( const CmdOption& );
87
88 };
89
90 template < typename T >
91 std::ostream& operator << ( std::ostream& _os, CmdOption<T>& _opt )
92 {
93 _os << (T&)_opt;
94 return _os;
95 }
96
97 #endif