Implement a prototype for a new version of radius_iterator.

During conversion, use the old code.

My target will have only two types of functionality:
* iterating over a circle of a given radius
* as above, with a LOS check towards the center

The current radius_iterator/circle_def/los_base tangle either takes a
majority of CPU time or at least a sizeable chunk in profile runs, due to
a bad case of OOP abuse in tight loops.  This badly needs a rewrite.  The
ability to pass it a square or someone else's los can be done using a
different iterator or checking los manually later, respectively.

1 files changed, 6 insertions, 0 deletions

diff --git a/crawl-ref/source/coordit.h b/crawl-ref/source/coordit.h
index 9c9695882a..966f6e0779 100644
--- a/crawl-ref/source/coordit.h
+++ b/crawl-ref/source/coordit.h
@@ -88,6 +88,11 @@ public:
     radius_iterator(const los_base* los,
                     bool exclude_center = false);
 
+    radius_iterator(const coord_def center, int param, circle_type ctype,
+                    los_type los, bool exclude_center = false);
+    radius_iterator(const coord_def center, los_type los,
+                    bool exclude_center = false);
+
     operator bool() const PURE;
     coord_def operator *() const PURE;
     const coord_def *operator->() const PURE;
@@ -103,6 +108,7 @@ private:
     circle_iterator iter;
     bool exclude_center;
     const los_base* los;  // restrict to the los if not NULL
+    unique_ptr<los_base> used_los;
     coord_def current;    // storage for operator->
 };