[base] introduce a command type that gets registered with the app

base/application.h

@@ -1,40 +1,60 @@
 #ifndef BASE_APPLICATION_H
 #define BASE_APPLICATION_H
 
+#include <boost/shared_ptr.hpp>
 #include <iostream>
 #include <list>
 #include <string>
 #include <stdexcept>
+#include <stdint.h>
 
 //----------------------------------------------------------------
 
 namespace base {
 	class command {
 	public:
-		typedef int (*cmd_fn)(int, char **);
+		typedef boost::shared_ptr<command> ptr;
 
-		command(std::string const &name, cmd_fn fn)
-			: name_(name),
-			  fn_(fn) {
-		}
+		command(std::string const &name);
+		virtual ~command() {}
+
+		void die(std::string const &msg);
+		uint64_t parse_uint64(std::string const &str, std::string const &desc);
+
+
+		virtual void usage(std::ostream &out) const = 0;
+		virtual int run(int argc, char **argv) = 0;
 
 		std::string const &get_name() const {
 			return name_;
 		}
 
+	private:
+		std::string name_;
+
+	};
+
+	class command_old : public command {
+	public:
+		typedef int (*cmd_fn)(int, char **);
+
+		command_old(std::string const &name, cmd_fn fn)
+			: command(name),
+			  fn_(fn) {
+		}
+
 		int run(int argc, char **argv) const {
 			return fn_(argc, argv);
 		}
 
 	private:
-		std::string name_;
 		cmd_fn fn_;
 	};
 
 	class application {
 	public:
-		void add_cmd(command const &c) {
-			cmds_.push_back(&c);
+		void add_cmd(command::ptr c) {
+			cmds_.push_back(c);
 		}
 
 		int run(int argc, char **argv);
@@ -43,7 +63,7 @@ namespace base {
 		void usage();
 		std::string get_basename(std::string const &path) const;
 
-		std::list<command const *> cmds_;
+		std::list<command::ptr> cmds_;
 	};
 }