[iter] Add value and projection to hb_all/any/none

Allows for eg, checking all values equal 2: hb_all (it, 2).

src/hb-iter.hh

@@ -649,11 +649,15 @@ HB_FUNCOBJ (hb_unzip);
 struct
 {
   template <typename Iterable,
+	    typename Val = bool,
+	    typename Proj = decltype ((hb_identity)),
 	    hb_requires (hb_is_iterable (Iterable))>
-  bool operator () (Iterable&& c) const
+  bool operator () (Iterable&& c,
+		    Val v = true,
+		    Proj&& f = hb_identity) const
   {
     for (auto it = hb_iter (c); it; ++it)
-      if (!*it)
+      if (!((Val) hb_get (hb_forward<Proj> (f), *it) == v))
 	return false;
     return true;
   }
@@ -662,11 +666,15 @@ HB_FUNCOBJ (hb_all);
 struct
 {
   template <typename Iterable,
+	    typename Val = bool,
+	    typename Proj = decltype ((hb_identity)),
 	    hb_requires (hb_is_iterable (Iterable))>
-  bool operator () (Iterable&& c) const
+  bool operator () (Iterable&& c,
+		    Val v = true,
+		    Proj&& f = hb_identity) const
   {
     for (auto it = hb_iter (c); it; ++it)
-      if (*it)
+      if (((Val) hb_get (hb_forward<Proj> (f), *it) == v))
 	return true;
     return false;
   }
@@ -675,11 +683,15 @@ HB_FUNCOBJ (hb_any);
 struct
 {
   template <typename Iterable,
+	    typename Val = bool,
+	    typename Proj = decltype ((hb_identity)),
 	    hb_requires (hb_is_iterable (Iterable))>
-  bool operator () (Iterable&& c) const
+  bool operator () (Iterable&& c,
+		    Val v = true,
+		    Proj&& f = hb_identity) const
   {
     for (auto it = hb_iter (c); it; ++it)
-      if (*it)
+      if (((Val) hb_get (hb_forward<Proj> (f), *it) == v))
 	return false;
     return true;
   }

src/test-iter.cc

@@ -140,6 +140,7 @@ main (int argc, char **argv)
 
   test_iterable (v);
   hb_set_t st;
+  st << 1 << 15 << 43;
   test_iterable (st);
   hb_sorted_array_t<int> sa;
   (void) static_cast<hb_iter_t<hb_sorted_array_t<int>, hb_sorted_array_t<int>::item_t>&> (sa);
@@ -162,7 +163,14 @@ main (int argc, char **argv)
   test_iterator_non_default_constructable (hb_iter (st) | hb_filter ());
   test_iterator_non_default_constructable (hb_iter (st) | hb_map (hb_identity));
 
-  hb_any (st);
+  assert (true == hb_all (st));
+  assert (false == hb_all (st, 42u));
+  assert (true == hb_any (st));
+  assert (false == hb_any (st, 14));
+  assert (true == hb_any (st, 15));
+  assert (false == hb_none (st));
+  assert (false == hb_none (st, 15));
+  assert (true == hb_none (st, 17));
 
   hb_array_t<hb_vector_t<int>> pa;
   pa->as_array ();