diff --git a/src/analyse/analyse.h b/src/analyse/analyse.h
index 784ce44..0100d9f 100644
--- a/src/analyse/analyse.h
+++ b/src/analyse/analyse.h
@@ -11,6 +11,18 @@
 // TODO: try double or 4-times size
 const uint32_t ANY_MAP_RESERVE = 65536;
 
+#include <iostream>
+
+class Test {
+public:
+    Test() {
+        std::cout << "Test init" << std::endl;
+    }
+    ~Test() {
+        std::cout << "Test destroy" << std::endl;
+    }
+};
+
 class Analyse {
 public:
     typedef std::function<bool(uint64_t)> match_t;
@@ -45,11 +57,15 @@ private:
 
 public:
     struct backtrack_t {
+//        backtrack_t(int i);
+
         uint64_t code;
         uint32_t layer_num;
         std::list<backtrack_t*> last;
         std::list<backtrack_t*> next;
 
+        Test test;
+
 //        bool operator==(const backtrack_t &b) const {
 //            return b.code == code;
 //        }
diff --git a/src/analyse/backtrack.cc b/src/analyse/backtrack.cc
index 3008add..9e2621e 100644
--- a/src/analyse/backtrack.cc
+++ b/src/analyse/backtrack.cc
@@ -11,7 +11,7 @@ namespace std {
     template<>
     struct hash<Analyse::backtrack_t> {
         std::size_t operator()(const Analyse::backtrack_t &b) const {
-//            std::cout << "get hash: " << b.code << std::endl;
+            std::cout << "get hash: " << b.code << std::endl;
             return std::hash<uint64_t>()(b.code);
         }
     };
@@ -19,9 +19,14 @@ namespace std {
     template<>
     struct equal_to<Analyse::backtrack_t> {
         bool operator()(const Analyse::backtrack_t &b1, const Analyse::backtrack_t &b2) const {
-//            std::cout << "get eq: " << b1.code << " ? " << b2.code << std::endl;
+            std::cout << "get eq: " << b1.code << " ? " << b2.code << std::endl;
             return b1.code == b2.code;
         }
+
+//        bool operator()(const Analyse::backtrack_t &b, uint64_t c) const {
+//            std::cout << "eq: " << b.code << " ? " << c << std::endl;
+//            return b.code == c;
+//        }
     };
 }
 
@@ -41,6 +46,7 @@ void Analyse::backtrack_demo(uint64_t code) {
             .layer_num = 1,
             .last = std::list<backtrack_t*>{},
             .next = std::list<backtrack_t*>{},
+
         });
     }
 
@@ -53,4 +59,9 @@ void Analyse::backtrack_demo(uint64_t code) {
         std::cout << "bucket " << i << " -> " << test.bucket_size(i) << std::endl;
     }
 
+    uint64_t dat = 4000;
+    auto ret = test.find((backtrack_t&)(dat));
+
+    std::cout << "insert demo ending" << std::endl;
+
 }