fix pathfind code dublication.

src/pathutils.cpp

@@ -18,6 +18,7 @@
  */
 
 #include "pathutils.hpp"
+#include "pathutils_impl.hpp"
 
 #include "map/map.hpp"
 
@@ -238,36 +239,14 @@ void get_tiles_radius(const gamemap& map, const std::vector<map_location>& locs,
                       bool with_border, const xy_pred& pred)
 {
 	typedef std::set<map_location> location_set;
-
-	location_set must_visit, filtered_out;
 	location_set not_visited(locs.begin(), locs.end());
 
-	for ( ; radius != 0  &&  !not_visited.empty(); --radius )
-	{
-		location_set::const_iterator it = not_visited.begin();
-		location_set::const_iterator it_end = not_visited.end();
-
-		result.insert(it, it_end);
-		for(; it != it_end; ++it) {
-			adjacent_loc_array_t adj;
-			get_adjacent_tiles(*it, adj.data());
-			for(std::size_t i = 0; i < adj.size(); ++i) {
-				const map_location& loc = adj[i];
-				if ( with_border ? map.on_board_with_border(loc) :
-				                   map.on_board(loc) ) {
-					if ( !result.count(loc) && !filtered_out.count(loc) ) {
-						if ( pred(loc) )
-							must_visit.insert(loc);
-						else
-							filtered_out.insert(loc);
-					}
-				}
-			}
+	get_tiles_radius(std::move(not_visited), radius, result, 
+		[&](const map_location& l) {
+			return with_border ? map.on_board_with_border(l) : map.on_board(l);
+		},
+		[&](const map_location& l) {
+			return pred(l);
 		}
-
-		not_visited.swap(must_visit);
-		must_visit.clear();
-	}
-
-	result.insert(not_visited.begin(), not_visited.end());
+	);
 }

src/pathutils_impl.hpp

@@ -0,0 +1,67 @@
+/*
+   Copyright (C) 2018 the Battle for Wesnoth Project https://www.wesnoth.org/
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+/** @file */
+
+#pragma once
+
+#include "map/location.hpp"
+#include <set>
+
+/**
+ * Function that will add to @a result all elements of @a locs, plus all
+ * on-board (that is: all locs that match @pred1) locations matching @a pred2
+ * that are connected to elements of
+ * locs by a chain of at most @a radius tiles, each of which matches @a pred2.
+ * @a result must be a std::set of locations.
+ * 
+ * @a pred1 a fast predicate (used before cachecheck).
+ * @a pred2 a slow predicate (used after cachecheck).
+ */
+template<typename FPred1, typename FPred2>
+void get_tiles_radius(std::set<map_location>&& locs, size_t radius, std::set<map_location>& result, const FPred1& pred1, const FPred2& pred2)
+{	
+	typedef std::set<map_location> location_set;
+	location_set must_visit, filtered_out;
+	location_set not_visited = std::move(locs);
+
+	for ( ; radius != 0  &&  !not_visited.empty(); --radius )
+	{
+		location_set::const_iterator it = not_visited.begin();
+		location_set::const_iterator it_end = not_visited.end();
+
+		result.insert(it, it_end);
+		for(; it != it_end; ++it) {
+			adjacent_loc_array_t adj;
+			get_adjacent_tiles(*it, adj.data());
+			for(size_t i = 0; i < adj.size(); ++i) {
+				const map_location& loc = adj[i];
+				if( pred1(loc) ) {
+					if( !result.count(loc) && !filtered_out.count(loc) ) {
+						if( pred2(loc) ) {
+							must_visit.insert(loc);
+						}
+						else {
+							filtered_out.insert(loc);
+						}
+					}
+				}
+			}
+		}
+
+		not_visited.swap(must_visit);
+		must_visit.clear();
+	}
+
+	result.insert(not_visited.begin(), not_visited.end());
+}

src/scripting/lua_terrainfilter.cpp

@@ -18,6 +18,7 @@
 #include "log.hpp"
 #include "map/location.hpp"
 #include "map/map.hpp"
+#include "pathutils_impl.hpp"
 #include "scripting/lua_common.hpp"
 #include "scripting/push_check.hpp"
 #include "scripting/game_lua_kernel.hpp"
@@ -194,48 +195,7 @@ namespace {
  * on-board locations matching @a pred that are connected to elements of
  * locs by a chain of at most @a radius tiles, each of which matches @a pred.
  * @a add_result a function that takes a location_range
- * @pred1 a fast predicate (used before cachecheck).
- * @pred2 a slow predicate (used after cachecheck).
 */
-using location_range = boost::iterator_range<location_set::const_iterator>;
-template<typename FPred1, typename FPred2>
-void get_tiles_radius(location_set&& locs, size_t radius, location_set& result, const FPred1& pred1, const FPred2& pred2)
-{
-
-	location_set must_visit, filtered_out;
-	location_set not_visited(locs.begin(), locs.end());
-
-	for ( ; radius != 0  &&  !not_visited.empty(); --radius )
-	{
-		location_set::const_iterator it = not_visited.begin();
-		location_set::const_iterator it_end = not_visited.end();
-
-		result.insert(it, it_end);
-		for(; it != it_end; ++it) {
-			adjacent_loc_array_t adj;
-			get_adjacent_tiles(*it, adj.data());
-			for(size_t i = 0; i < adj.size(); ++i) {
-				const map_location& loc = adj[i];
-				if( pred1(loc) ) {
-					if( !result.count(loc) && !filtered_out.count(loc) ) {
-						if( pred2(loc) ) {
-							must_visit.insert(loc);
-						}
-						else {
-							filtered_out.insert(loc);
-						}
-					}
-				}
-			}
-		}
-
-		not_visited.swap(must_visit);
-		must_visit.clear();
-	}
-
-	result.insert(not_visited.begin(), not_visited.end());
-}
-
 
 } //end namespace