ValueOption.h

/*
 *  $Id$
 *  ValueOption class interface
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2006-07, IRIT UPS.
 *
 *  OTAWA is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  OTAWA is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OTAWA; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef ELM_OPTION_VALUEOPTION_H_
#define ELM_OPTION_VALUEOPTION_H_
 
#include <elm/option/Option.h>
#include <elm/type_info.h>
 
namespace elm { namespace option {
 
// AbstractValueOption class
class AbstractValueOption: public Option {
public:
    class Make: public Option::Make {
        friend class AbstractValueOption;
    public:
        inline Make(Manager *man): Option::Make(man), _usage(arg_required) { }
        inline Make(Manager& man): Option::Make(man), _usage(arg_required) { }
        inline Make& argDescription(cstring s) { arg_desc = s; return *this; }
        inline Make& arg(cstring s) { arg_desc = s; return *this; }
        inline Make& usage(usage_t u) { _usage = u; return *this; }
        inline Make& cmd(string c) { Option::Make::cmd(c); return *this; }
        inline Make& description(cstring d) { Option::Make::description(d); return *this; }
        inline Make& help(cstring d) { Option::Make::description(d); return *this; }
    private:
        cstring arg_desc;
        usage_t _usage;
    };
 
    AbstractValueOption(const Make& make);
    AbstractValueOption(Manager& man);
 
    // Option overload
    cstring description(void) override;
    usage_t usage(void) override;
    cstring argDescription(void) override;
 
private:
    cstring arg_desc;
    usage_t use;
};
 
 
// useful inline
template <class T>
inline T read(string arg) { T val; arg >> val; return val; }
 
 
// ValueOption<T> class
template <class T>
class ValueOption: public AbstractValueOption {
public:
    class Make: public AbstractValueOption::Make {
        friend class ValueOption<T>;
    public:
        inline Make(Manager *man): AbstractValueOption::Make(man) { }
        inline Make(Manager& man): AbstractValueOption::Make(man) { }
        inline Make& argDescription(cstring s) { AbstractValueOption::Make::argDescription(s); return *this; }
        inline Make& arg(cstring s) { AbstractValueOption::Make::argDescription(s); return *this; }
        inline Make& usage(usage_t u) { AbstractValueOption::Make::usage(u); return *this; }
        inline Make& cmd(string c) { Option::Make::cmd(c); return *this; }
        inline Make& description(cstring d) { Option::Make::description(d); return *this; }
        inline Make& help(cstring d) { Option::Make::description(d); return *this; }
        inline Make& def(const T& d) { _def = d; return *this; }
    private:
        T _def;
    };
 
    inline ValueOption(void) { }
    inline ValueOption(const Make& make): AbstractValueOption(make), val(make._def) { }
 
    inline const T& get(void) const { return val; };
    inline void set(const T& value) { val = value; };
 
    // Operators
    inline operator const T&(void) const { return get(); };
    inline ValueOption<T>& operator=(const T& value) { set(value); return *this; };
    inline const T& operator*(void) const { return get(); }
    inline operator bool(void) const { return get(); }
 
    // Option overload
    virtual void process(String arg) { val = read<T>(arg); }
 
    // deprecated
    inline const T& value(void) const { return val; };
 
private:
    T val;
    inline T get(VarArg& args) { return args.next<T>(); }
};
 
 
// alias
template <class T> class Value: public ValueOption<T> {
public:
    inline Value(const typename ValueOption<T>::Make& make): ValueOption<T>(make) { }
};
 
// read specializations
template <> string read<string>(string arg);
template <> cstring read<cstring>(string arg);
 
} } // elm::option
 
#endif /* ELM_OPTION_VALUEOPTION_H_ */