diff --git a/src/klotski_core/common_code/common_code.h b/src/klotski_core/common_code/common_code.h
index 03af9c1..68c048d 100644
--- a/src/klotski_core/common_code/common_code.h
+++ b/src/klotski_core/common_code/common_code.h
@@ -132,14 +132,12 @@ public:
 
 /// CommonCode create
 inline CommonCode CommonCode::create(uint64_t common_code) {
-    return CommonCode(common_code); // create from uint64_t
+    return CommonCode(common_code); // with check
 }
 
 /// CommonCode create without check
 inline CommonCode CommonCode::unsafe_create(uint64_t common_code) noexcept {
-    auto tmp = CommonCode(); // init directly
-    tmp.code_ = common_code;
-    return tmp;
+    return *(CommonCode*)&common_code; // init directly
 }
 
 /// Compare implements
diff --git a/src/klotski_core/raw_code/raw_code.h b/src/klotski_core/raw_code/raw_code.h
index 7c28cd2..9b553ee 100644
--- a/src/klotski_core/raw_code/raw_code.h
+++ b/src/klotski_core/raw_code/raw_code.h
@@ -118,14 +118,12 @@ public:
 
 /// RawCode create
 inline RawCode RawCode::create(uint64_t raw_code) {
-    return RawCode(raw_code);
+    return RawCode(raw_code); // with check
 }
 
 /// RawCode create without check
 inline RawCode RawCode::unsafe_create(uint64_t raw_code) noexcept {
-    auto tmp = RawCode(); // init directly
-    tmp.code_ = raw_code;
-    return tmp;
+    return *(RawCode*)&raw_code; // init directly
 }
 
 /// Compare implements
diff --git a/src/klotski_core/short_code/short_code.h b/src/klotski_core/short_code/short_code.h
index 0856d27..c72eb62 100644
--- a/src/klotski_core/short_code/short_code.h
+++ b/src/klotski_core/short_code/short_code.h
@@ -143,14 +143,12 @@ public:
 
 /// ShortCode create
 inline ShortCode ShortCode::create(uint32_t short_code) {
-    return ShortCode(short_code);
+    return ShortCode(short_code); // with check
 }
 
 /// ShortCode create without check
 inline ShortCode ShortCode::unsafe_create(uint32_t short_code) noexcept {
-    auto tmp = ShortCode(); // init directly
-    tmp.code_ = short_code;
-    return tmp;
+    return *(ShortCode*)&short_code; // init directly
 }
 
 /// Compare implements