Remove bidirectionality from radius_iterator.

This wasn't used anywhere and could easily be restored if
required.

2 files changed, 1 insertions, 38 deletions

diff --git a/crawl-ref/source/coordit.cc b/crawl-ref/source/coordit.cc
index cfe817a192..b93b4aad98 100644
--- a/crawl-ref/source/coordit.cc
+++ b/crawl-ref/source/coordit.cc
@@ -120,22 +120,6 @@ void radius_iterator::step()
     }
 }
 
-void radius_iterator::step_back()
-{
-    const int minx = std::max(X_BOUND_1+1, center.x - radius);
-    const int maxx = std::min(X_BOUND_2-1, center.x + radius);
-    const int miny = std::max(Y_BOUND_1+1, center.y - radius);
-
-    location.x--;
-    if (location.x < minx)
-    {
-        location.x = maxx;
-        location.y--;
-        if (location.y < miny)
-            iter_done = true;
-    }
-}
-
 bool radius_iterator::on_valid_square() const
 {
     if (!in_bounds(location))
@@ -164,26 +148,9 @@ const radius_iterator& radius_iterator::operator++()
     return (*this);
 }
 
-const radius_iterator& radius_iterator::operator--()
-{
-    do
-        this->step_back();
-    while (!this->done() && !this->on_valid_square());
-
-    return (*this);
-}
-
 radius_iterator radius_iterator::operator++(int dummy)
 {
     const radius_iterator copy = *this;
     ++(*this);
     return (copy);
 }
-
-radius_iterator radius_iterator::operator--(int dummy)
-{
-    const radius_iterator copy = *this;
-    --(*this);
-    return (copy);
-}
-
diff --git a/crawl-ref/source/coordit.h b/crawl-ref/source/coordit.h
index b7323bbef8..ecf57fad53 100644
--- a/crawl-ref/source/coordit.h
+++ b/crawl-ref/source/coordit.h
@@ -19,7 +19,7 @@ private:
     coord_def current, topleft, bottomright;
 };
 
-class radius_iterator : public std::iterator<std::bidirectional_iterator_tag,
+class radius_iterator : public std::iterator<std::forward_iterator_tag,
                         coord_def>
 {
 public:
@@ -35,12 +35,9 @@ public:
     const coord_def* operator->() const;
 
     const radius_iterator& operator ++ ();
-    const radius_iterator& operator -- ();
     radius_iterator operator ++ (int);
-    radius_iterator operator -- (int);
 private:
     void step();
-    void step_back();
     bool on_valid_square() const;
 
     coord_def location, center;
@@ -59,4 +56,3 @@ public:
 };
 
 #endif
-