[iter] First sample use

src/Makefile.am

@@ -388,13 +388,16 @@ compiled_tests = test-iter test-ot-tag test-unicode-ranges
 check_PROGRAMS += $(compiled_tests)
 TESTS += $(compiled_tests)
 
-test_iter_SOURCES = test-iter.cc
+test_iter_SOURCES = test-iter.cc hb-static.cc
+test_iter_CPPFLAGS = $(HBCFLAGS) -DMAIN
+test_iter_LDADD = libharfbuzz.la $(HBLIBS)
 
 test_ot_tag_SOURCES = hb-ot-tag.cc
 test_ot_tag_CPPFLAGS = $(HBCFLAGS) -DMAIN
 test_ot_tag_LDADD = libharfbuzz.la $(HBLIBS)
 
 test_unicode_ranges_SOURCES = test-unicode-ranges.cc
+test_unicode_ranges_CPPFLAGS = $(HBCFLAGS) -DMAIN
 test_unicode_ranges_LDADD = libharfbuzz.la $(HBLIBS)
 
 TESTS_ENVIRONMENT = \

src/hb-iter.hh

@@ -41,11 +41,11 @@
  */
 
 /* Base class for all iterators. */
-template <typename Iter>
+template <typename Iter, typename Item = typename Iter::__item_type__>
 struct hb_iter_t
 {
   typedef Iter type_t;
-  typedef typename Iter::__type__ item_type_t;
+  typedef Item item_type_t;
 
   /* https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern */ 
   const type_t* thiz () const { return static_cast<const type_t *> (this); }
@@ -56,10 +56,10 @@ struct hb_iter_t
   explicit_operator bool () const { return more (); }
   item_type_t& operator * () { return item (); }
   item_type_t& operator [] (unsigned i) { return item (i); }
-  type_t& operator += (unsigned count) { forward (count); return thiz(); }
-  type_t& operator ++ () { next (); return thiz(); }
-  type_t& operator -= (unsigned count) { rewind (count); return thiz(); }
-  type_t& operator -- () { prev (); return thiz(); }
+  type_t& operator += (unsigned count) { forward (count); return *thiz(); }
+  type_t& operator ++ () { next (); return *thiz(); }
+  type_t& operator -= (unsigned count) { rewind (count); return *thiz(); }
+  type_t& operator -- () { prev (); return *thiz(); }
   type_t operator + (unsigned count) { type_t c (*thiz()); c += count; return c; }
   type_t operator ++ (int) { type_t c (*thiz()); ++*thiz(); return c; }
   type_t operator - (unsigned count) { type_t c (*thiz()); c -= count; return c; }
@@ -67,8 +67,8 @@ struct hb_iter_t
 
   /* Methods. */
   type_t iter () const { return *thiz(); }
-  item_type_t item () const { return thiz()->__item__ (); }
-  item_type_t item (unsigned i) const { return thiz()->__item__ (i); }
+  item_type_t& item () const { return thiz()->__item__ (); }
+  item_type_t& item_at (unsigned i) const { return thiz()->__item_at__ (i); }
   bool more () const { return thiz()->__more__ (); }
   void next () { thiz()->__next__ (); }
   void forward (unsigned n) { thiz()->__forward__ (n); }
@@ -80,12 +80,9 @@ struct hb_iter_t
    * Subclasses overrides:
    */
 
-  /* Item type. */
-  //typedef ... __type__;
-
-  /* Access: Implement __item__(), or __item__(n) if random-access. */
-  item_type_t __item__ () const { return thiz()->item (0); }
-  item_type_t __item__ (unsigned i) const { return *(thiz() + i); }
+  /* Access: Implement __item__(), or __item_at__() if random-access. */
+  item_type_t& __item__ () const { return thiz()->item_at (0); }
+  item_type_t& __item_at__ (unsigned i) const { return *(thiz() + i); }
 
   /* Termination: Implement __more__() or __end__(). */
   bool __more__ () const { return item () != thiz()->__end__ (); }

src/test-iter.cc

@@ -26,16 +26,32 @@
 
 #include "hb-iter.hh"
 
+#include "hb-array.hh"
+
+template <typename T>
+struct array_iter_t : hb_iter_t<array_iter_t<T>, T>
+{
+  array_iter_t (hb_array_t<T> arr_) : arr (arr_) {}
+
+  T& __item_at__ (unsigned i) const { return arr[i]; }
+  bool __more__ () const { return arr.len; }
+  void __forward__ (unsigned n) { arr += n; }
+  void __rewind__ (unsigned n) { arr -= n; }
+  unsigned __len__ () const { return arr.len; }
+
+  private:
+  hb_array_t<T> arr;
+};
+
 int
 main (int argc, char **argv)
 {
   const int src[10] = {};
   int dst[20];
 
-#if 0
-  hb_iter_t<const int *> s (src);
-  hb_iter_t<const int *> s2 (src, 5);
-  hb_iter_t<int *> t (dst);
+  array_iter_t<const int> s (src);
+  array_iter_t<const int> s2 (src);
+  array_iter_t<int> t (dst);
 
   s2 = s;
 
@@ -43,7 +59,6 @@ main (int argc, char **argv)
    {
     *t = *s;
    }
-#endif
 
   return 0;
 }