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    1 //
    2 // Copyright 2013 Francisco Jerez
    3 //
    4 // Permission is hereby granted, free of charge, to any person obtaining a
    5 // copy of this software and associated documentation files (the "Software"),
    6 // to deal in the Software without restriction, including without limitation
    7 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
    8 // and/or sell copies of the Software, and to permit persons to whom the
    9 // Software is furnished to do so, subject to the following conditions:
   10 //
   11 // The above copyright notice and this permission notice shall be included in
   12 // all copies or substantial portions of the Software.
   13 //
   14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   17 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   18 // OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   19 // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   20 // OTHER DEALINGS IN THE SOFTWARE.
   21 //
   22 
   23 #ifndef CLOVER_UTIL_ADAPTOR_HPP
   24 #define CLOVER_UTIL_ADAPTOR_HPP
   25 
   26 #include <iterator>
   27 
   28 #include "util/tuple.hpp"
   29 #include "util/pointer.hpp"
   30 #include "util/functional.hpp"
   31 
   32 namespace clover {
   33    namespace detail {
   34       ///
   35       /// Implementation of the iterator concept that transforms the
   36       /// value of the source iterators \a Is on dereference by use of
   37       /// a functor \a F.
   38       ///
   39       /// The exact category of the resulting iterator should be the
   40       /// least common denominator of the source iterator categories.
   41       ///
   42       template<typename F, typename... Is>
   43       class iterator_adaptor {
   44       public:
   45          typedef std::forward_iterator_tag iterator_category;
   46          typedef typename std::result_of<
   47                F(typename std::iterator_traits<Is>::reference...)
   48             >::type reference;
   49          typedef typename std::remove_reference<reference>::type value_type;
   50          typedef pseudo_ptr<value_type> pointer;
   51          typedef std::ptrdiff_t difference_type;
   52 
   53          iterator_adaptor() {
   54          }
   55 
   56          iterator_adaptor(F f, std::tuple<Is...> &&its) :
   57             f(f), its(std::move(its)) {
   58          }
   59 
   60          reference
   61          operator*() const {
   62             return tuple::apply(f, tuple::map(derefs(), its));
   63          }
   64 
   65          iterator_adaptor &
   66          operator++() {
   67             tuple::map(preincs(), its);
   68             return *this;
   69          }
   70 
   71          iterator_adaptor
   72          operator++(int) {
   73             auto jt = *this;
   74             ++*this;
   75             return jt;
   76          }
   77 
   78          bool
   79          operator==(const iterator_adaptor &jt) const {
   80             return its == jt.its;
   81          }
   82 
   83          bool
   84          operator!=(const iterator_adaptor &jt) const {
   85             return its != jt.its;
   86          }
   87 
   88          pointer
   89          operator->() const {
   90             return { **this };
   91          }
   92 
   93          iterator_adaptor &
   94          operator--() {
   95             tuple::map(predecs(), its);
   96             return *this;
   97          }
   98 
   99          iterator_adaptor
  100          operator--(int) {
  101             auto jt = *this;
  102             --*this;
  103             return jt;
  104          }
  105 
  106          iterator_adaptor &
  107          operator+=(difference_type n) {
  108             tuple::map(advances_by(n), its);
  109             return *this;
  110          }
  111 
  112          iterator_adaptor &
  113          operator-=(difference_type n) {
  114             tuple::map(advances_by(-n), its);
  115             return *this;
  116          }
  117 
  118          iterator_adaptor
  119          operator+(difference_type n) const {
  120             auto jt = *this;
  121             jt += n;
  122             return jt;
  123          }
  124 
  125          iterator_adaptor
  126          operator-(difference_type n) const {
  127             auto jt = *this;
  128             jt -= n;
  129             return jt;
  130          }
  131 
  132          difference_type
  133          operator-(const iterator_adaptor &jt) const {
  134             return std::get<0>(its) - std::get<0>(jt.its);
  135          }
  136 
  137          reference
  138          operator[](difference_type n) const {
  139             return *(*this + n);
  140          }
  141 
  142          bool
  143          operator<(iterator_adaptor &jt) const {
  144             return *this - jt < 0;
  145          }
  146 
  147          bool
  148          operator>(iterator_adaptor &jt) const {
  149             return *this - jt > 0;
  150          }
  151 
  152          bool
  153          operator>=(iterator_adaptor &jt) const {
  154             return !(*this < jt);
  155          }
  156 
  157          bool
  158          operator<=(iterator_adaptor &jt) const {
  159             return !(*this > jt);
  160          }
  161 
  162       protected:
  163          F f;
  164          std::tuple<Is...> its;
  165       };
  166 
  167       template<typename F, typename... Is>
  168       iterator_adaptor<F, Is...>
  169       operator+(typename iterator_adaptor<F, Is...>::difference_type n,
  170                 const iterator_adaptor<F, Is...> &jt) {
  171          return (jt + n);
  172       }
  173 
  174       template<typename F, typename... Is>
  175       iterator_adaptor<F, Is...>
  176       operator-(typename iterator_adaptor<F, Is...>::difference_type n,
  177                 const iterator_adaptor<F, Is...> &jt) {
  178          return (jt - n);
  179       }
  180    }
  181 }
  182 
  183 #endif