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#ifndef __OPKELE_ITERATOR_H
#define __OPKELE_ITERATOR_H
#include <cassert>
#include <iterator>
namespace opkele {
namespace util {
using std::iterator;
using std::forward_iterator_tag;
using std::output_iterator_tag;
template <typename T>
class basic_output_iterator_proxy_impl : public iterator<output_iterator_tag,T,void,T*,T&> {
public:
virtual ~basic_output_iterator_proxy_impl() { }
virtual basic_output_iterator_proxy_impl<T>* dup() const = 0;
basic_output_iterator_proxy_impl<T>& operator*() { return *this; };
virtual basic_output_iterator_proxy_impl<T>& operator=(const T& x) = 0;
};
template<typename IT,typename T=typename IT::value_type>
class output_iterator_proxy_impl : public basic_output_iterator_proxy_impl<T> {
public:
IT i;
output_iterator_proxy_impl(const IT& _i) : i(_i) { }
basic_output_iterator_proxy_impl<T>* dup() const {
return new output_iterator_proxy_impl<IT,T>(i); }
basic_output_iterator_proxy_impl<T>& operator=(const T& x) {
(*i) = x; return *this; }
};
template<typename T>
class output_iterator_proxy : public iterator<output_iterator_tag,T,void,T*,T&> {
public:
basic_output_iterator_proxy_impl<T> *I;
template<typename IT>
output_iterator_proxy(const IT& i)
: I(new output_iterator_proxy_impl<IT,T>(i)) { }
output_iterator_proxy(const output_iterator_proxy<T>& x)
: I(x.I->dup()) { }
~output_iterator_proxy() { delete I; }
output_iterator_proxy& operator=(const output_iterator_proxy<T>& x) {
delete I; I = x.I->dup(); }
output_iterator_proxy& operator*() { return *this; }
output_iterator_proxy& operator=(const T& x) {
(**I) = x; return *this; }
output_iterator_proxy& operator++() { return *this; }
output_iterator_proxy& operator++(int) { return *this; }
};
template <typename T,typename TR=T&,typename TP=T*>
class basic_forward_iterator_proxy_impl : public iterator<forward_iterator_tag,T,void,TP,TR> {
public:
virtual ~basic_forward_iterator_proxy_impl() { }
virtual basic_forward_iterator_proxy_impl<T,TR,TP>* dup() const = 0;
virtual bool operator==(const basic_forward_iterator_proxy_impl<T,TR,TP>& x) const = 0;
virtual bool operator!=(const basic_forward_iterator_proxy_impl<T,TR,TP>& x) const {
return !((*this)==x); }
virtual TR operator*() const = 0;
virtual TP operator->() const = 0;
virtual void advance() = 0;
};
template <typename IT>
class forward_iterator_proxy_impl : public basic_forward_iterator_proxy_impl<typename IT::value_type,typename IT::reference,typename IT::pointer> {
public:
IT i;
forward_iterator_proxy_impl(const IT& _i) : i(_i) { }
virtual basic_forward_iterator_proxy_impl<typename IT::value_type,typename IT::reference,typename IT::pointer>* dup() const {
return new forward_iterator_proxy_impl<IT>(i); }
virtual bool operator==(const basic_forward_iterator_proxy_impl<typename IT::value_type,typename IT::reference,typename IT::pointer>& x) const {
return i==static_cast<const forward_iterator_proxy_impl<IT>*>(&x)->i; }
virtual bool operator!=(const basic_forward_iterator_proxy_impl<typename IT::value_type,typename IT::reference,typename IT::pointer>& x) const {
return i!=static_cast<const forward_iterator_proxy_impl<IT>*>(&x)->i; }
virtual typename IT::reference operator*() const { return *i; }
virtual typename IT::pointer operator->() const { return i.operator->(); }
virtual void advance() { ++i; }
};
template<typename T,typename TR=T&,typename TP=T*>
class forward_iterator_proxy : public iterator<forward_iterator_tag,T,void,TP,TR> {
public:
basic_forward_iterator_proxy_impl<T,TR,TP> *I;
template<typename IT>
forward_iterator_proxy(const IT& i)
: I(new forward_iterator_proxy_impl<IT>(i)) { }
forward_iterator_proxy(const forward_iterator_proxy<T,TR,TP>& x)
: I(x.I->dup()) { }
~forward_iterator_proxy() { delete I; }
forward_iterator_proxy& operator=(const forward_iterator_proxy<T,TR,TP>& x) {
delete I; I = x.I->dup(); return *this; }
bool operator==(const forward_iterator_proxy<T,TR,TP>& x) const {
return (*I)==(*(x.I)); }
bool operator!=(const forward_iterator_proxy<T,TR,TP>& x) const {
return (*I)!=(*(x.I)); }
TR operator*() const {
return **I; }
TP operator->() const {
return I->operator->(); }
forward_iterator_proxy<T,TR,TP>& operator++() {
I->advance(); return *this; }
forward_iterator_proxy<T,TR,TP>& operator++(int) {
forward_iterator_proxy<T,TR,TP> rv(*this);
I->advance(); return rv; }
};
template<typename IT>
class basic_filterator : public iterator<
typename IT::iterator_category,
typename IT::value_type,
typename IT::difference_type,
typename IT::pointer,
typename IT::reference> {
public:
IT it;
IT ei;
bool empty;
basic_filterator() : empty(true) { }
basic_filterator(const IT& _bi,const IT& _ei)
: it(_bi), ei(_ei) { empty = (it==ei); }
basic_filterator(const basic_filterator<IT>& x)
: it(x.it), ei(x.ei), empty(x.empty) { }
virtual ~basic_filterator() { }
bool operator==(const basic_filterator<IT>& x) const {
return empty?x.empty:(it==x.it); }
bool operator!=(const basic_filterator<IT>& x) const {
return empty!=x.empty || it!=x.it; }
typename IT::reference operator*() const {
assert(!empty);
return *it; }
typename IT::pointer operator->() const {
assert(!empty);
return it.operator->(); }
basic_filterator<IT>& operator++() {
bool found = false;
for(++it;!(it==ei || (found=is_interesting()));++it) ;
if(!found) empty=true;
return *this;
}
void prepare() {
bool found = false;
for(;!(it==ei || (found=is_interesting()));++it) ;
if(!found) empty = true;
}
virtual bool is_interesting() const = 0;
};
template<typename IT,typename T=typename IT::value_type::first_type,typename TR=T&,typename TP=T*>
class map_keys_iterator : public iterator<
typename IT::iterator_category,
T,void,TP,TR> {
public:
typedef map_keys_iterator<IT,T,TR,TP> self_type;
IT it;
IT ei;
bool empty;
map_keys_iterator() : empty(true) { }
map_keys_iterator(const IT& _bi,
const IT& _ei)
: it(_bi), ei(_ei) { empty = (it==ei); }
map_keys_iterator(const self_type& x)
: it(x.it), ei(x.ei), empty(x.empty) { }
bool operator==(const self_type& x) const {
return empty?x.empty:(it==x.it); }
bool operator!=(const self_type& x) const {
return empty!=x.empty || it!=x.it; }
TR operator*() const {
assert(!empty);
return it->first; }
TP operator->() const {
assert(!empty);
return &(it->first); }
self_type& operator++() {
assert(!empty);
empty=((++it)==ei); return *this; }
self_type operator++(int) {
self_type rv(*this);
++(*this); return rv; }
};
}
}
#endif /* __OPKELE_ITERATOR_H */
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