1 files changed, 13 insertions, 3 deletions
diff --git a/common/tile.cpp b/common/tile.cpp
index 15d0d9d..29e0c84 100644
--- a/common/tile.cpp
+++ b/common/tile.cpp
@@ -1,5 +1,7 @@
 #include "tile.h"
 
+#include <algorithm>
+
 Tile::Tile() {
 	
 }
@@ -8,7 +10,7 @@ Tile::Tile(Tile::Type t, bool re, bool ro) : type(t), red(re), rotated(ro){
 	
 }
 
-int Tile::get_num() {
+int Tile::get_num() const {
 	if(type >= Man_1 && type <= Sou_9) {
 		return (type - Man_1) % 9 + 1;
 	} else {
@@ -16,11 +18,19 @@ int Tile::get_num() {
 	}
 }
 
-bool Tile::operator==(const Tile& other) {
+bool Tile::operator==(const Tile& other) const {
 	return type == other.type;
 }
 
+bool Tile::operator<(const Tile& other) const {
+	return type == other.type ? red : type < other.type;
+}
+
 Tile Tile::operator++(int) {
 	type = Type(type + 1);
 	return *this;
-}
-\ No newline at end of file
+}
+
+void Tiles::sort() {
+	std::sort(begin(), end());
+}