Add const to member functions

src/attack_prediction.cpp

@@ -317,7 +317,7 @@ class prob_matrix
 
 private:
 	// This gives me 10% speed improvement over std::vector<> (g++4.0.3 x86)
-	std::unique_ptr<double[]> new_plane();
+	std::unique_ptr<double[]> new_plane() const;
 
 	void initialize_plane(unsigned plane,
 			unsigned a_cur,
@@ -449,7 +449,7 @@ prob_matrix::prob_matrix(unsigned int a_max,
 }
 
 /** Allocate a new probability array, initialized to 0. */
-std::unique_ptr<double[]> prob_matrix::new_plane()
+std::unique_ptr<double[]> prob_matrix::new_plane() const
 {
 	const unsigned int size = rows_ * cols_;
 	std::unique_ptr<double[]> res(new double[size]);

src/display.cpp

@@ -2324,7 +2324,7 @@ void display::bounds_check_position()
 	}
 }
 
-void display::bounds_check_position(int& xpos, int& ypos)
+void display::bounds_check_position(int& xpos, int& ypos) const
 {
 	const int tile_width = hex_width();
 

src/display.hpp

@@ -493,7 +493,7 @@ class display : public filter_context, public video2::draw_layering
 	double idle_anim_rate() const { return idle_anim_rate_; }
 
 	void bounds_check_position();
-	void bounds_check_position(int& xpos, int& ypos);
+	void bounds_check_position(int& xpos, int& ypos) const;
 
 	/**
 	 * Scrolls the display by xmov,ymov pixels.

src/filesystem_boost.cpp

@@ -78,7 +78,7 @@ namespace {
 			char_t_to*& to_next;
 			char_t_to* to_end;
 
-			bool can_push(size_t count)
+			bool can_push(size_t count) const
 			{
 				return static_cast<size_t>(to_end - to_next) > count;
 			}

src/game_events/pump.cpp

@@ -131,7 +131,7 @@ class pump_manager
 		return pumped_count_ >= queue_.size();
 	}
 
-	unsigned count()
+	unsigned count() const
 	{
 		return impl_.instance_count;
 	}

src/play_controller.hpp

@@ -238,7 +238,7 @@ class play_controller : public controller_base, public events::observer, public
 		return is_regular_game_end();
 	}
 
-	void maybe_throw_return_to_play_side()
+	void maybe_throw_return_to_play_side() const
 	{
 		if(should_return_to_play_side() && !linger_ ) {
 			throw return_to_play_side_exception();