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authorMichael Krelin <hacker@klever.net>2008-01-20 21:04:13 (UTC)
committer Michael Krelin <hacker@klever.net>2008-01-20 21:04:13 (UTC)
commit6d68bef7f60980ab70e0e1f9f8b5c50b616f4255 (patch) (side-by-side diff)
tree198b34fb9ad5ea926c64e5b88d001cd056755f81 /include/opkele
parent7f6d0f9ec59f8f04a1c768ae5c27a621223ff628 (diff)
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opkele/iterator.h header
added a bunch of utility iterators * output and forward iterator proxies * filtering iterator * map key extracting iterator Signed-off-by: Michael Krelin <hacker@klever.net>
Diffstat (limited to 'include/opkele') (more/less context) (show whitespace changes)
-rw-r--r--include/opkele/iterator.h217
1 files changed, 217 insertions, 0 deletions
diff --git a/include/opkele/iterator.h b/include/opkele/iterator.h
new file mode 100644
index 0000000..812a786
--- a/dev/null
+++ b/include/opkele/iterator.h
@@ -0,0 +1,217 @@
+#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;
+ }
+ };
+
+ 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; }
+
+ 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(); }
+
+ 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 = (bi==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;
+ }
+ basic_filterator<IT> operator++(int) {
+ basic_filterator<IT> rv(*this);
+ ++(*this);
+ return rv;
+ }
+
+ 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 = (bi==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 */