*
* Example:
* ./myprog OptionName=OptionValue
+ * ./myprog -f=/some/file
+ * ./myprog --level=15
*/
template<typename OptionType>
class Option
/**
* Current Option name
*/
- OptionName name;
+ const OptionName name;
/**
* Current Option value
* @param description Description of current Option
* @param function Function used to handle current Option.
*/
- Option(std::string name, const std::string & description, void (*function)(OptionType))
+ Option(const std::string & name, const std::string & description, void (*function)(OptionType))
: Parameter(description), Callable<OptionType>(function), name(name) {
}
* @throw std::invalid_argument when OptionValue part failed conversion
* to OptionType
*/
- virtual bool understand(const std::string & argv) {
- if ((!used) &&
- (argv.find(name) == 0)) {
+ virtual bool understand(const std::string & argv)
+ throw(std::invalid_argument) {
+
+ if ((!used) && (argv.find(name) == 0)) {
std::size_t pos = argv.find("=");
+
if (pos != name.size()) {
throw std::invalid_argument("Option: " + name + " requires value but no one has been provided");
}
std::stringstream ss;
-
ss << argv.substr(pos + 1);
- ss >> value;
+ ss >> value;// memory leak? when uncommented and exception is
+ // thrown, valgrind shows e.g.:
+ // possibly lost: 380 bytes in 7 blocks
if (ss.fail()) {
throw std::invalid_argument("Value for option: " + name + " failed conversion to the required type");
return false;
}
};
+
+ /**
+ * Template class responsible for handling commandline options.
+ * Options are non-required, named parameters of program.
+ * This template specialization allows Options to work like switches.
+ * It means that just named parameter is needed to invoke command. No value
+ * is used.
+ *
+ * Example:
+ * ./myprog OptionName
+ * ./myprog -h
+ * ./myprog --help
+ */
+ template<>
+ class Option<void>
+ : public Parameter, public Callable<void> {
+ public:
+ typedef std::string OptionName;
+ protected:
+ /**
+ * Current Option name
+ */
+ const OptionName name;
+
+ /** Variable indicating if current Option was already used or not */
+ bool used = false;
+
+ public:
+ /**
+ * Default constructor.
+ *
+ * @param name Name of the current Option
+ * @param description Description of current Option
+ * @param function Function used to handle current Option.
+ */
+ Option(const std::string & name, const std::string & description, void (*function)(void))
+ : Parameter(description), Callable<void>(function), name(name) {
+ }
+
+ /**
+ *
+ */
+ virtual void handle() {
+ this->call();
+ }
+
+ /**
+ * Method used for checking if Option understands given user value.
+ * If so, current Option is flagged as used and no more checks against
+ * it will be done in future.
+ *
+ * Passed value should be in form of:
+ * OptionName
+ *
+ * @param argv command line value against which test will be made.
+ * User value should be in format: OptionName.
+ *
+ * @return If passed argv succesfully detected OptionName returns true
+ * and Option is set as used one. Otherwise returns false and can be
+ * used to check against next value.
+ */
+ virtual bool understand(const std::string & argv) {
+ if ((!used) &&
+ (argv == name)) {
+ used = true;
+ return true;
+ }
+ return false;
+ }
+ };
}
#endif /* __COMMAND_OPTION_H */