move is_observer from game_board to display_context, b/c editor uses

src/display_context.cpp

@@ -20,6 +20,8 @@
 #include "unit.hpp"
 #include "unit_map.hpp"
 
+#include <boost/foreach.hpp>
+
 const unit * display_context::get_visible_unit(const map_location & loc, const team &current_team, bool see_all) const
 {
 	if (!map().on_board(loc)) return NULL;
@@ -82,3 +84,16 @@ int display_context::village_owner(const map_location& loc) const
 	return -1;
 }
 
+/**
+ * Determine if we are an observer, by checking if every team is not locally controlled
+ */
+bool display_context::is_observer() const
+{
+	BOOST_FOREACH(const team &t, teams()) {
+		if (t.is_local())
+			return false;
+	}
+
+	return true;
+}
+

src/display_context.hpp

@@ -53,6 +53,11 @@ class display_context {
 	 */
 	int village_owner(const map_location & loc) const;
 
+	// Accessor from team.cpp
+
+	/// Check if we are an observer in this game
+	bool is_observer() const;
+
 	// Dtor
 
 	virtual ~display_context() {}

src/game_board.cpp

@@ -237,17 +237,6 @@ bool game_board::change_terrain(const map_location &loc, const std::string &t_st
 	return true;
 }
 
-bool game_board::is_observer() const
-{
-	BOOST_FOREACH(const team &t, teams_) {
-		if (t.is_local())
-			return false;
-	}
-
-	return true;
-}
-
-
 void game_board::write_config(config & cfg) const {
 	for(std::vector<team>::const_iterator t = teams_.begin(); t != teams_.end(); ++t) {
 		int side_num = t - teams_.begin() + 1;

src/game_board.hpp

@@ -136,10 +136,6 @@ class game_board : public display_context {
 	// Wrapped functions from unit_map. These should ultimately provide notification to observers, pathfinding.
 
 	unit_map::iterator find_unit(const map_location & loc) { return units_.find(loc); }
-
-	// Accessor from team.cpp
-
-	bool is_observer() const;
 };
 
 void swap(game_board & one, game_board & other);