STK_SparseIteratorBase.h

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/*--------------------------------------------------------------------*/
/*     Copyright (C) 2004-2016  Serge Iovleff, Université Lille 1, Inria
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.
 
    This program 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 Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
    License along with this program; if not, write to the
    Free Software Foundation, Inc.,
    59 Temple Place,
    Suite 330,
    Boston, MA 02111-1307
    USA
 
    Contact : S..._Dot_I..._At_stkpp_Dot_org (see copyright for ...)
*/
 
/*
 * Project:  stkpp::Arrays
 * created on: 28 marsh 2017
 * Author:   iovleff, S..._Dot_I..._At_stkpp_Dot_org (see copyright for ...)
 **/
 
#ifndef STK_ITERATORBASE_H
#define STK_ITERATORBASE_H
 
#include <Sdk.h>
 
namespace STK
{
namespace hidden
{
template <typename Derived> struct IteratorTraits;
 
} // namespace hidden
 
template<class Derived>
struct SparseIteratorBase: public IRecursiveTemplate<Derived>
{
  private:
    SparseIteratorBase(): pos_(){}
 
    typedef typename hidden::IteratorTraits<Derived>::Index Index;
 
    typedef typename hidden::IteratorTraits<Derived>::iterator_category iterator_category;
    typedef typename hidden::IteratorTraits<Derived>::value_type value_type;
    typedef typename hidden::IteratorTraits<Derived>::reference reference;
    typedef typename hidden::IteratorTraits<Derived>::pointer pointer;
    typedef typename hidden::IteratorTraits<Derived>::difference_type difference_type;
 
  protected:
 
    SparseIteratorBase( Index& pos): pos_(pos) {}
    SparseIteratorBase( SparseIteratorBase const& it):  pos_(it.pos_) {}
    ~SparseIteratorBase() {}
 
  public:
    int pos() const  { return pos_;}
 
    // moving
    Derived& operator++()         { ++pos_; return this->asDerived(); }
    Derived& operator++(int junk) { ++pos_; return this->asDerived(); }
    Derived& operator--()         { --pos_; return this->asDerived(); }
    Derived& operator--(int)      { --pos_; return this->asDerived(); }
 
    Derived& operator+=(int n)    { pos_+=n; return this->asDerived(); }
    Derived& operator-=(int n)    { pos_-=n; return this->asDerived(); }
    friend SparseIteratorBase operator+( SparseIteratorBase const& it, int n)
    { SparseIteratorBase r(it); r+=n ; return r; }
    friend SparseIteratorBase operator+(int n, SparseIteratorBase const& it)
    { SparseIteratorBase r(it); r+=n ; return r; }
    friend SparseIteratorBase operator-( SparseIteratorBase const& it, int n)
    { SparseIteratorBase r(it); r-=n ; return r; }
    friend SparseIteratorBase operator-(int n, SparseIteratorBase const& it)
    { SparseIteratorBase r(it); r-=n ; return r; }
 
    friend difference_type operator-(SparseIteratorBase it1, SparseIteratorBase it2)
    { return it1.pos_ - it2.pos_;}
 
    // comparing
    bool operator==( SparseIteratorBase const& rhs) { return(pos_ ==rhs.pos_); }
    bool operator!=( SparseIteratorBase const& rhs) { return(pos_!=rhs.pos_); }
 
    friend bool operator<(SparseIteratorBase const& lhs, SparseIteratorBase const& rhs)
    { return lhs.pos_ < rhs.pos_; };
    friend bool operator>(SparseIteratorBase const& lhs, SparseIteratorBase const& rhs)
    { return lhs.pos_ > rhs.pos_; };
    friend bool operator<=(SparseIteratorBase const& lhs, SparseIteratorBase const& rhs)
    { return lhs.pos_ <= rhs.pos_; };
    friend bool operator>=(SparseIteratorBase const& lhs, SparseIteratorBase const& rhs)
    { return lhs.pos_ >= rhs.pos_; };
 
    friend void swap(SparseIteratorBase& lhs, SparseIteratorBase& rhs)
    { std::swap(lhs.pos_, rhs.pos_);}
 
  protected:
    Index& pos_;
};
 
 
} // namespace STK
 
#endif /* STK_ITERATORBASE_H */