Tuple.h

/*
 *  Tuple interface and tuple providers.
 *
 *  This file is part of OTAWA
 *  Copyright (c) 2017, 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_RTTI_TUPLE_H_
#define ELM_RTTI_TUPLE_H_
 
#include <elm/rtti/type_of.h>
#include <elm/rtti/Class.h>
 
namespace elm { namespace rtti {
 
class Tuple {
public:
    virtual ~Tuple();
    virtual const Vector<const rtti::Type *>& types() const = 0;
    virtual void split(void *ptr, Vector<Variant>& values) const = 0;
    virtual void *make(const Vector<Variant>& values, int i = 0) const = 0;
    inline int count() const { return types().length(); }
};
 
template <class T>
class AbstractTuple: public AbstractClass, public Tuple {
public:
    AbstractTuple(cstring name): AbstractClass(name) { }
    void *instantiate(void) const override { return new T; }
    void free(void *obj) const override { delete static_cast<T *>(obj); }
    const Tuple *toTuple() const override { return this; }
    const Vector<const rtti::Type *>& types() const override { return _types; }
protected:
    inline void add(const rtti::Type *t) { _types.add(t); }
private:
    Vector<const rtti::Type *> _types;
};
 
template <class T, class A>
class Tuple1: public AbstractTuple<T> {
public:
    typedef A (T::*acc_t)() const;
    Tuple1(cstring name, acc_t acc): AbstractTuple<T>(name), _acc(acc)
        { AbstractTuple<T>::add(&type_of<A>()); }
    void split(void *ptr, Vector<Variant>& values) const override
        { values.add(Variant((static_cast<const T *>(ptr)->*_acc)())); }
    void *make(const Vector<Variant>& values, int i) const override
        {   cerr << "DEBUG: " << values[i].as<A>() << io::endl;
            return new T(values[i].as<A>()); }
private:
    acc_t _acc;
};
 
template <class T, class A>
AbstractClass *tuple1(cstring name, A (T::*a)() const) { return new Tuple1<T, A>(name, a); }
 
class Declare {
public:
    inline Declare(const AbstractClass *cls): _cls(cls) { }
    inline const AbstractClass& get() const { return *_cls; }
    inline const AbstractClass& operator*() const { return get(); }
    inline const AbstractClass *operator->() const { return &get(); }
private:
    const AbstractClass *_cls;
};
 
} } // elm::rtti
 
#endif /* ELM_RTTI_TUPLE_H_ */