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CmdOption.hh
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#ifndef CMDOPTION
#define CMDOPTION
template <typename T>
class CmdOption
{
public:
typedef T value_type;
explicit CmdOption(const T& _val) : val_(_val), valid_(true), enabled_(false) { }
CmdOption() : val_(T()),valid_(false), enabled_(false) { }
// has been set and has a value
bool is_valid(void) const { return valid_; }
bool has_value(void) const { return is_valid(); }
// has been set and may have an value (check with is_valid())
bool is_enabled() const { return enabled_; }
void enable() { enabled_ = true; }
CmdOption& operator = ( const T& _val )
{
val_ = _val;
valid_=true;
enable();
return *this;
}
operator T () const { return val_; }
// operator const T& () const { return val_; }
operator T* () const { return is_valid() ? &val_ : nullptr; }
private:
T val_;
bool valid_;
bool enabled_;
private: // non-copyable
CmdOption(const CmdOption&);
CmdOption& operator = ( const CmdOption& );
};
template < typename T >
std::ostream& operator << ( std::ostream& _os, CmdOption<T>& _opt )
{
_os << (T&)_opt;
return _os;
}
#endif
CmdOption
Definition CmdOption.hh:49