std::string_view 的使用

module/Local_Server/server/Global.cpp

@@ -4,6 +4,7 @@
 #include <fstream>
 #include <sstream>
 #include <string>
+#include <string_view>
 
 BaseLogger *server_logger = nullptr;
 Debug_Logger_Info_Manager debug_logger_info_manager;
@@ -101,7 +102,7 @@ Global::Global() {
   };
 #endif
 
-  SSR::cpr_cb = [](SSR::CPR_Error_Type t, const std::string &log,
+  SSR::cpr_cb = [](SSR::CPR_Error_Type t, std::string_view log,
                    SSR::P_S msg) {
     auto src = std::dynamic_pointer_cast<Data_Source>(msg->source);
     Mode_S_Statistic_Data *ss = &src->mode_s_statistic;
@@ -113,7 +114,7 @@ Global::Global() {
   // 处理错误
   SSR::parse_call_back =
       [this](SSR::Parse_Call_Back_Type type, SSR::Aircraft_Info *info,
-             const std::string &field_name, std::vector<std::string> bds_list,
+             std::string_view field_name, std::vector<std::string> bds_list,
              void *, SSR::P_S msg) {
         auto src = std::dynamic_pointer_cast<Data_Source>(msg->source);
         Mode_S_Statistic_Data *ss = &src->mode_s_statistic;
@@ -151,25 +152,26 @@ Global::Global() {
 }
 Global::~Global() { std::cout << "Global::~Global()" << std::endl; }
 
-void replace(std::string &originalStr, const std::string &findStr,
-             const std::string &replaceStr) {
+void replace(std::string &originalStr, std::string_view findStr,
+             std::string_view replaceStr) {
   size_t pos = originalStr.find(findStr);
   while (pos != std::string::npos) {
     originalStr.replace(pos, findStr.length(), replaceStr);
     pos = originalStr.find(findStr, pos + replaceStr.length());
   }
 }
-std::string oneLine(std::string str) {
-  replace(str, "\n", "[n]");
-  return str;
+std::string oneLine(std::string_view str) {
+  auto ret = std::string(str);
+  replace(ret, "\n", "[n]");
+  return ret;
 }
-bool isHexadecimal(const std::string &str) {
+bool isHexadecimal(std::string_view str) {
   return std::all_of(str.begin(), str.end(), [](unsigned char c) {
     return std::isdigit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
   });
 }
 void handle_buffer_muti_start(
-    std::string &buffer, const std::string &data,
+    std::string &buffer, std::string_view data,
     const std::set<std::string> &prefix_list,
     const std::function<void(std::string &)> &callback) {
   if (!data.empty()) {
@@ -184,7 +186,7 @@ void handle_buffer_muti_start(
       size_t pos = 0, n = buffer.size();
       for (; pos < n; pos++) {
         bool find = false;
-        for (const std::string &prefix : prefix_list) {
+        for (std::string_view prefix : prefix_list) {
           if (pos + prefix.size() <= n) {
             if (buffer.substr(pos, prefix.size()) == prefix) {
               c = prefix;
@@ -207,8 +209,8 @@ void handle_buffer_muti_start(
   }
 }
 void handle_buffer_head_tail(
-    std::string &buffer, const std::string &data, const std::string &prefix,
-    const std::string &suffix,
+    std::string &buffer, std::string_view data, std::string_view prefix,
+    std::string_view suffix,
     const std::function<void(std::string &)> &callback) {
   // 只在数据可用时进行读取
   if (!data.empty()) {
@@ -272,24 +274,25 @@ bool is_10004(SSR::Mode_S_Msg &msg) {
   return DF_11_17_18;
 }
 
-std::string to_file_name(std::string str) {
+std::string to_file_name(std::string_view str) {
+  auto ret = std::string(str);
   // 定义允许的合法字符
   auto is_valid_char = [](char c) {
     return std::isalnum(c) || c == '_' || c == '-' ||
            c == '.'; // 允许字母、数字、下划线、连字符、点
   };
   // 替换非法字符为下划线 '_'
-  std::transform(str.begin(), str.end(), str.begin(),
+  std::transform(ret.begin(), ret.end(), ret.begin(),
                  [&](char c) { return is_valid_char(c) ? c : '_'; });
   // 检查结果字符串是否全是替换字符，防止生成全是下划线的文件名
-  if (str.find_first_not_of('_') == std::string::npos) {
+  if (ret.find_first_not_of('_') == std::string::npos) {
     return "default_file_name"; // 返回一个默认文件名
   }
-  return str;
+  return ret;
 }
-void Debug_Logger_Info_Manager::push_info(const std::string &c) {
+void Debug_Logger_Info_Manager::push_info(std::string_view c) {
   std::lock_guard g(mtx);
-  std::string content = std::to_string(cur_serial_number) + ": " + c;
+  std::string content = std::to_string(cur_serial_number) + ": " + std::string(c);
   size_t content_length = content.size();
   info_list.push_back({cur_serial_number, content});
   current_total_length += content_length;
@@ -308,7 +311,7 @@ JSON Debug_Logger_Info_Manager::to_json() {
   ret.append({"cur_serial_number", cur_serial_number});
   return ret;
 }
-bool Web_Server::listen(const std::string &host, int port) {
+bool Web_Server::listen(std::string_view host, int port) {
   drogon::HttpAppFramework *app = &drogon::app();
   auto g = Global::instance();
   Json::Value drogon_config;
@@ -329,7 +332,7 @@ bool Web_Server::listen(const std::string &host, int port) {
   }
   app->loadConfigJson(drogon_config);
   app->disableSigtermHandling(); // 关闭服务器信号处理
-  app->addListener(host, port);
+  app->addListener(std::string(host), port);
   auto base_dir = get_exe_dir();
   // app->setLogPath(base_dir + "/logs/drogon.log");
   app->setUploadPath(base_dir + "/drogon_uploads");