feat: `to_short_code` trait in CommonCode

src/common/CMakeLists.txt

@@ -1,3 +1,4 @@
 cmake_minimum_required(VERSION 3.0)
 
 add_library(common common.cc)
+target_link_libraries(common short_code)

src/common_code/common_code.cc

@@ -12,6 +12,10 @@ uint64_t CommonCode::unwrap() const {
     return code; // get raw uint64_t code
 }
 
+ShortCode CommonCode::to_short_code() const { // convert to short code
+    return ShortCode(*this);
+}
+
 CommonCode::CommonCode(uint64_t common_code) {
     if (!CommonCode::check(common_code)) { // check input common code
         throw std::invalid_argument("invalid common code");

src/common_code/common_code.h

@@ -2,10 +2,14 @@
 
 #include <string>
 #include <cstdint>
+#include "short_code.h"
+
+class ShortCode;
 
 class CommonCode {
 public:
     uint64_t unwrap() const;
+    ShortCode to_short_code() const;
     static bool check(uint64_t common_code);
     std::string to_string(bool shorten = false) const;
 

src/main.cc

@@ -114,8 +114,10 @@ int main() {
 //    std::cout << ShortCode(14323231).to_common_code().to_string() << std::endl;
 //    std::cout << ShortCode(CommonCode(0x6EC0F8800)).to_string() << std::endl;
 
-    std::cout << ShortCode(CommonCode(0x6EC0F8800), ShortCode::NORMAL).to_string() << std::endl;
-    std::cout << ShortCode(CommonCode(0x6EC0F8800), ShortCode::FAST).to_string() << std::endl;
+//    std::cout << ShortCode(CommonCode(0x6EC0F8800), ShortCode::NORMAL).to_string() << std::endl;
+//    std::cout << ShortCode(CommonCode(0x6EC0F8800), ShortCode::FAST).to_string() << std::endl;
+
+    std::cout << CommonCode(0x6EC0F8800).to_short_code().to_string() << std::endl;
 
     return 0;
 }

src/short_code/short_code.cc

@@ -1,3 +1,4 @@
+#include <stdexcept>
 #include "short_code.h"
 #include "short_code_chars.h"
 

src/short_code/short_code.h

@@ -6,6 +6,8 @@
 #include <unordered_map>
 #include "common_code.h"
 
+class CommonCode;
+
 class ShortCode {
 public:
     enum Mode {