Rearrange GetOpt internals to provide a nicer external interface

[libs/core.git] / source / core / getopt.h

diff --git a/source/core/getopt.h b/source/core/getopt.h
index 56ab05123584ef83fcc51cd838802ef4a941c453..d3369c6b46fdf57b392b5a8dc56507fc6b79a773 100644 (file)
--- a/source/core/getopt.h
+++ b/source/core/getopt.h
@@ -32,7 +32,20 @@ public:
                REQUIRED_ARG
        };
        
-       class OptBase
+       class Option
+       {
+       protected:
+               Option() { }
+       public:
+               virtual ~Option() { }
+
+               virtual Option &set_help(const std::string &) = 0;
+               virtual Option &set_help(const std::string &, const std::string &) = 0;
+               virtual unsigned get_seen_count() const = 0;
+       };
+
+private:
+       class OptBase: public Option
        {
        protected:
                char shrt;
@@ -46,14 +59,14 @@ public:
        public:
                virtual ~OptBase() { }
 
-               OptBase &set_help(const std::string &);
-               OptBase &set_help(const std::string &, const std::string &);
+               virtual OptBase &set_help(const std::string &);
+               virtual OptBase &set_help(const std::string &, const std::string &);
                char get_short() const { return shrt; }
                const std::string &get_long() const { return lng; }
                ArgType get_arg_type() const { return arg_type; }
                const std::string &get_help() const { return help; }
                const std::string &get_metavar() const { return metavar; }
-               unsigned get_seen_count() const { return seen_count; }
+               virtual unsigned get_seen_count() const { return seen_count; }
                void process();
                void process(const std::string &);
        protected:
@@ -61,15 +74,14 @@ public:
                virtual void store(const std::string &) = 0;
        };
 
-private:
        template<typename T>
-       class Option: public OptBase
+       class SimpleOption: public OptBase
        {
        private:
                T &data;
 
        public:
-               Option(char s, const std::string &l, T &d, ArgType a): OptBase(s, l, a), data(d) { }
+               SimpleOption(char s, const std::string &l, T &d, ArgType a): OptBase(s, l, a), data(d) { }
 
                virtual void store() { }
 
@@ -122,18 +134,20 @@ public:
        const std::vector<std::string> &get_args() const { return args; }
 
        template<typename T>
-       OptBase &add_option(char s, const std::string &l, T &d, ArgType a = NO_ARG)
-       { opts.push_back(new Option<T>(s, l, d, a)); return *opts.back(); }
+       Option &add_option(char s, const std::string &l, T &d, ArgType a = NO_ARG)
+       { return add_option(new SimpleOption<T>(s, l, d, a)); }
        
        template<typename T>
-       OptBase &add_option(char s, const std::string &l, std::list<T> &d, ArgType a = REQUIRED_ARG)
-       { opts.push_back(new ListOption<std::list<T> >(s, l, d, a)); return *opts.back(); }
+       Option &add_option(char s, const std::string &l, std::list<T> &d, ArgType a = REQUIRED_ARG)
+       { return add_option(new ListOption<std::list<T> >(s, l, d, a)); }
        
        template<typename T>
-       OptBase &add_option(const std::string &l, T &d, ArgType a)
+       Option &add_option(const std::string &l, T &d, ArgType a)
        { return add_option(0, l, d, a); }
 
 private:
+       OptBase &add_option(OptBase *);
+
        OptBase &get_option(char);
        OptBase &get_option(const std::string &);
 
@@ -158,10 +172,13 @@ public:
        std::string generate_help() const;
 };
 
-template<> inline void GetOpt::Option<bool>::store()     { data = true; }
-template<> inline void GetOpt::Option<unsigned>::store() { ++data; }
+template<> inline void GetOpt::SimpleOption<bool>::store()
+{ data = true; }
+
+template<> inline void GetOpt::SimpleOption<unsigned>::store()
+{ ++data; }
 
-template<> inline void GetOpt::Option<std::string>::store(const std::string &a)
+template<> inline void GetOpt::SimpleOption<std::string>::store(const std::string &a)
 { data = a; }
 
 template<> inline void GetOpt::ListOption<std::list<std::string> >::store(const std::string &a)