CastableIterator.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
#include <typeinfo>
#include <stdexcept>
#include <iostream>
#include <vector>
#include <string>
 
#include "Castable.h"
 
#ifndef CASTABLE_ITERATOR
#define CASTABLE_ITERATOR
 
// // using namespace std;
 
namespace drain {
 
 
 
 
 
// Consider inheriting Caster directly now that it has a pointer
// Consider adding iterators directly to members or begin/end methods of Castable.
class CastableIterator : protected Castable { //private Castable {
 
public:
 
    CastableIterator(){
        setPtr(NULL, typeid(void));
    }
 
    CastableIterator(const CastableIterator &it){
        setPtr(it.caster.ptr, it.getType());
    }
 
    CastableIterator(void *p, const std::type_info & t){
        setPtr(p, t);
    }
 
 
    template <class T>
    CastableIterator(T *p) : Castable(p) {
        //std::cerr << "CastableIterator(T *p), T:"<< typeid(T).name() << "\n";
    }
 
 
 
    CastableIterator(std::string *p){
        throw std::runtime_error("CastableIterator(std::string *p): std::string iterators not implemented");
    }
 
 
 
    CastableIterator(void *p){
        throw std::runtime_error("CastableIterator(void *p): void iterators not allowed");
    }
 
    virtual inline
    ~CastableIterator(){};
 
    inline
    CastableIterator & operator=(const CastableIterator &it){
        if (&it != this){
            // std::cerr << "CastableIterator operator=(const & CastableIterator) \n";
            setPtr(it.caster.ptr, it.getType());
        }
        return *this;
    }
 
 
    // Problematic. Compare with (void *p).
    template <class T>
    inline
    CastableIterator & operator=(T *p){
        //std::cerr << "CastableIterator::operator=, type:"<< typeid(T).name() << "\n";
        if (typeid(T) == typeid(void)){
            // Does not change type.
            // What about elementCount?
            caster.ptr = p;
            elementCount = 1;
        }
        else {
            if (typeIsSet() && (getType() != typeid(T))){
                // Type info provided, set also type.
                setPtr(p, typeid(T));
                //std::cerr << "Warning"
                throw std::runtime_error("CastableIterator operator=(T *p): implicit type change requested");
            }
            else { // type unset, or no change
                setPtr(p, typeid(T));
            }
        }
        return *this;
    }
 
 
    /*
    inline
    CastableIterator & operator=(void *p){
        //std::cerr << "CastableIterator::operator=(void *):\n";
        //setPtr(p,getType());
        ptr = p;
        return *this;
    }
    */
 
    inline
    void setType(const std::type_info &type){
        caster.setType(type);
    };
 
    inline
    const std::type_info & getType() const {
        return caster.getType();
    };
 
 
    inline
    bool operator==(const CastableIterator &it) const {
        return (caster.ptr == it.caster.ptr);
    };
 
    inline
    bool operator!=(const CastableIterator &it) const {
        return (caster.ptr != it.caster.ptr);
    };
 
    inline
    bool operator<(const CastableIterator &it) const {
        return (caster.ptr < it.caster.ptr);
    };
 
    inline
    bool operator>(const CastableIterator &it) const {
        return (caster.ptr > it.caster.ptr);
    };
 
    inline
    CastableIterator & operator++(){
        char *cptr = (char *)caster.ptr;
        caster.ptr = (cptr + caster.getElementSize());
        return *this;
    };
 
    inline
    CastableIterator operator++(int){
        CastableIterator tmp = *this;
        char *cptr = (char *)caster.ptr;
        caster.ptr = (cptr + caster.getElementSize());
        return tmp;
    };
 
    inline
    CastableIterator & operator--(){
        char *cptr = (char *)caster.ptr;
        caster.ptr = (cptr - caster.getElementSize());
        return *this;
    };
 
    inline
    CastableIterator operator--(int){
        CastableIterator tmp = *this;
        char *cptr = (char *)caster.ptr;
        caster.ptr = (cptr - caster.getElementSize());
        return tmp;
    };
 
 
    inline
    const Castable & operator*() const {
        return (const Castable &) *this;
    };
 
 
    inline
    Castable & operator*(){
        return (Castable &)*this;
    };
 
    inline
    operator const void*() const {
        return caster.ptr;
    };
 
    /*
    inline
    operator long() const {
        return (long)caster.ptr;
    };
    */
 
 
    template <class T>
    operator T() const {
        return (T)(caster.ptr);
    }
 
 
 
};
 
inline
std::ostream & operator<<(std::ostream & ostr, const CastableIterator & it){
    ostr << (long)it;
    return ostr;
}
/*
class CastableIterator : public CastableIteratorBase {
 
public:
 
    template <class T>
    CastableIterator(T *p) : CastableIteratorBase(p) {
    }
 
 
    inline
    Castable & operator*(){
        return (Castable &)*this;
    };
 
 
};
*/
 
/*
class CastableConstIterator : public CastableIteratorBase {
 
public:
 
    template <class T>
    CastableConstIterator(T *p) : CastableIteratorBase(p) {
    }
 
};
*/
 
 
}  // namespace drain
 
 
#endif
 
 
// Drain