Author: tschmitz
Date: Tue Aug 2 12:17:19 2011
New Revision: 50562
URL: http://svn.gna.org/viewcvs/wesnoth?rev=50562&view=rev
Log:
Added class template visitor_base.
Modified:
trunk/src/whiteboard/visitor.hpp
Modified: trunk/src/whiteboard/visitor.hpp
URL:
http://svn.gna.org/viewcvs/wesnoth/trunk/src/whiteboard/visitor.hpp?rev=50562&r1=50561&r2=50562&view=diff
==============================================================================
--- trunk/src/whiteboard/visitor.hpp (original)
+++ trunk/src/whiteboard/visitor.hpp Tue Aug 2 12:17:19 2011
@@ -20,12 +20,89 @@
#ifndef WB_VISITOR_HPP_
#define WB_VISITOR_HPP_
+#include "action.hpp"
+#include "side_actions.hpp"
#include "typedefs.hpp"
+
+#include "play_controller.hpp"
+#include "resources.hpp"
+#include "team.hpp"
#include <boost/noncopyable.hpp>
namespace wb
{
+
+/**
+ * visitor_base: A base class template, using the so-called CRTP
+ * If you want visit_all() and reverse_visit_all() in your class,
+ * you should derive from this class.
+ * Derived classes can "override" the following:
+ * visit, pre_visit_team, post_visit_team
+ * Derived classes should declare visitor_base<Derived> as a friend, or
+ * else make the overridden functions public.
+ * I recommend making the inheritance private or protected.
+ */
+template<typename Derived>
+class visitor_base
+{
+public:
+ void visit_all() {visit_all_helper<false>();}
+ void reverse_visit_all() {visit_all_helper<true>();}
+
+protected:
+ /**
+ * visit():
+ * @return Whether or not to continue any visitation after this
action.
+ * The fcn is commented out because derived classes are required to
implement it.
+ */
+ //bool visit(size_t team_index, team&, side_actions&,
side_actions::iterator);
+
+ ///@return Whether or not to visit any of the contents of sa.
+ bool pre_visit_team(size_t team_index, team& t, side_actions& sa)
{return true;}
+ ///@return Whether or not to visit any more teams after this one.
+ bool post_visit_team(size_t team_index, team& t, side_actions& sa)
{return true;}
+
+private:
+ template<bool reverse>
+ void visit_all_helper()
+ {
+ Derived* const new_this = static_cast<Derived*>(this);
+
+ size_t const current_team =
resources::controller->current_side() - 1;
+ size_t const num_teams = resources::teams->size();
+ for(size_t iteration = 0; iteration < num_teams; ++iteration)
+ {
+ size_t const team_index
+ = (current_team+num_teams+(reverse?
-1-iteration: iteration)) % num_teams;
+ team& t = resources::teams->at(team_index);
+ side_actions& sa = *t.get_side_actions();
+ if(!new_this->pre_visit_team(team_index,t,sa))
+ continue; //< Skip this team's actions
+
+ if(reverse)
+ {
+ side_actions::reverse_iterator itor =
sa.rbegin();
+ side_actions::reverse_iterator end = sa.rend();
+ while(itor!=end) {
+ ++itor;
+
if(!new_this->visit(team_index,t,sa,itor.base()))
+ return; //< Early abort
+ }
+ }
+ else //forward
+ {
+ side_actions::iterator itor = sa.begin();
+ side_actions::iterator end = sa.end();
+ for(; itor!=end; ++itor)
+
if(!new_this->visit(team_index,t,sa,itor))
+ return; //< Early abort
+ }
+ if(!new_this->post_visit_team(team_index,t,sa))
+ break; //< Early abort
+ }
+ }
+};
/**
* Abstract base class for all the visitors (cf GoF Visitor Design Pattern)
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