From ae6c005b87a1b19170a3dcb9736f98cd28225719 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sat, 27 Jan 2024 19:09:47 +0800
Subject: [PATCH 1/7] simplify router

---
 examples/client/main.cpp      |  10 ++--
 examples/server/main.cpp      |  14 ++---
 include/rest_rpc/connection.h |  13 ++++-
 include/rest_rpc/router.h     | 106 ++++++++++++++++------------------
 include/rest_rpc/rpc_server.h |   8 +--
 5 files changed, 77 insertions(+), 74 deletions(-)

diff --git a/examples/client/main.cpp b/examples/client/main.cpp
index c35d60a..bd12645 100644
--- a/examples/client/main.cpp
+++ b/examples/client/main.cpp
@@ -217,7 +217,7 @@ void test_echo() {
   }
 
   {
-    auto result = client.call<std::string>("async_echo", "test");
+    auto result = client.call<std::string>("delay_echo", "test");
     std::cout << result << std::endl;
   }
 }
@@ -349,11 +349,11 @@ void test_callback() {
   rpc_client client;
   bool r = client.connect("127.0.0.1", 9000);
 
-  for (size_t i = 0; i < 100; i++) {
+  for (size_t i = 0; i < 10; i++) {
     std::string test = "test" + std::to_string(i + 1);
     // set timeout 100ms
-    client.async_call<100>(
-        "async_echo",
+    client.async_call<10000>(
+        "delay_echo",
         [](const asio::error_code &ec, string_view data) {
           if (ec) {
             std::cout << ec.value() << " timeout" << std::endl;
@@ -361,7 +361,7 @@ void test_callback() {
           }
 
           auto str = as<std::string>(data);
-          std::cout << "echo " << str << '\n';
+          std::cout << "delay echo " << str << '\n';
         },
         test);
 
diff --git a/examples/server/main.cpp b/examples/server/main.cpp
index 3305c90..47da07f 100644
--- a/examples/server/main.cpp
+++ b/examples/server/main.cpp
@@ -75,11 +75,11 @@ std::string get_name(rpc_conn conn, const person &p) {
 
 // if you want to response later, you can use async model, you can control when
 // to response
-void async_echo(rpc_conn conn, const std::string &src) {
-  auto req_id =
-      conn.lock()->request_id(); // note: you need keep the request id at that
-                                 // time, and pass it into the async thread
-
+void delay_echo(rpc_conn conn, const std::string &src) {
+  auto sp = conn.lock();
+  sp->set_delay(true);
+  auto req_id = sp->request_id(); // note: you need keep the request id at that
+  // time, and pass it into the async thread
   std::thread thd([conn, req_id, src] {
     std::this_thread::sleep_for(std::chrono::seconds(1));
     auto conn_sp = conn.lock();
@@ -121,7 +121,7 @@ dummy1 get_dummy(rpc_conn conn, dummy1 d) { return d; }
 
 int main() {
   //  benchmark_test();
-  rpc_server server(9000, std::thread::hardware_concurrency());
+  rpc_server server(9000, std::thread::hardware_concurrency(), 3600);
 
   dummy d;
   server.register_handler("add", &dummy::add, &d);
@@ -135,7 +135,7 @@ int main() {
   server.register_handler("upload", upload);
   server.register_handler("download", download);
   server.register_handler("get_name", get_name);
-  server.register_handler<Async>("async_echo", async_echo);
+  server.register_handler("delay_echo", delay_echo);
   server.register_handler("echo", echo);
   server.register_handler("get_int", get_int);
 
diff --git a/include/rest_rpc/connection.h b/include/rest_rpc/connection.h
index 1690aa3..7219e74 100644
--- a/include/rest_rpc/connection.h
+++ b/include/rest_rpc/connection.h
@@ -101,6 +101,8 @@ class connection : public std::enable_shared_from_this<connection>,
     callback_ = std::move(callback);
   }
 
+  void set_delay(bool delay) { delay_ = delay; }
+
   void on_network_error(std::function<void(std::shared_ptr<connection>,
                                            std::string)> &on_net_err) {
     on_net_err_ = &on_net_err;
@@ -208,8 +210,14 @@ class connection : public std::enable_shared_from_this<connection>,
           if (!ec) {
             read_head();
             if (req_type_ == request_type::req_res) {
-              router_.route<connection>(func_id, body_.data(), length,
-                                        this->shared_from_this());
+              route_result_t ret = router_.route<connection>(
+                  func_id, nonstd::string_view{body_.data(), length},
+                  this->shared_from_this());
+              if (delay_) {
+                delay_ = false;
+              } else {
+                response(req_id_, std::move(ret.result));
+              }
             } else if (req_type_ == request_type::sub_pub) {
               try {
                 msgpack_codec codec;
@@ -420,6 +428,7 @@ class connection : public std::enable_shared_from_this<connection>,
       nullptr;
   router &router_;
   nonstd::any user_data_;
+  bool delay_ = false;
 };
 } // namespace rpc_service
 } // namespace rest_rpc
diff --git a/include/rest_rpc/router.h b/include/rest_rpc/router.h
index 1cde1dc..8f7d268 100644
--- a/include/rest_rpc/router.h
+++ b/include/rest_rpc/router.h
@@ -4,33 +4,38 @@
 #include "codec.h"
 #include "md5.hpp"
 #include "meta_util.hpp"
+#include "string_view.hpp"
 #include "use_asio.hpp"
 #include <functional>
 #include <string>
 #include <unordered_map>
 
 namespace rest_rpc {
-enum class ExecMode { sync, async };
-const constexpr ExecMode Async = ExecMode::async;
-
 namespace rpc_service {
 class connection;
 
+enum class router_error { ok, no_such_function, has_exception, unkonw };
+
+struct route_result_t {
+  router_error ec = router_error::unkonw;
+  std::string result;
+};
+
 class router : asio::noncopyable {
 public:
-  template <ExecMode model, typename Function>
+  template <typename Function>
   void register_handler(std::string const &name, Function f) {
     uint32_t key = MD5::MD5Hash32(name.data());
     key2func_name_.emplace(key, name);
-    return register_nonmember_func<model>(key, std::move(f));
+    return register_nonmember_func(key, std::move(f));
   }
 
-  template <ExecMode model, typename Function, typename Self>
+  template <typename Function, typename Self>
   void register_handler(std::string const &name, const Function &f,
                         Self *self) {
     uint32_t key = MD5::MD5Hash32(name.data());
     key2func_name_.emplace(key, name);
-    return register_member_func<model>(key, f, self);
+    return register_member_func(key, f, self);
   }
 
   void remove_handler(std::string const &name) {
@@ -48,14 +53,9 @@ class router : asio::noncopyable {
   }
 
   template <typename T>
-  void route(uint32_t key, const char *data, std::size_t size,
-             std::weak_ptr<T> conn) {
-    auto conn_sp = conn.lock();
-    if (!conn_sp) {
-      return;
-    }
-
-    auto req_id = conn_sp->request_id();
+  route_result_t route(uint32_t key, nonstd::string_view data,
+                       std::weak_ptr<T> conn) {
+    route_result_t route_result{};
     std::string result;
     try {
       msgpack_codec codec;
@@ -63,26 +63,28 @@ class router : asio::noncopyable {
       if (it == map_invokers_.end()) {
         result = codec.pack_args_str(
             result_code::FAIL, "unknown function: " + get_name_by_key(key));
-        conn_sp->response(req_id, std::move(result));
-        return;
-      }
-
-      ExecMode model;
-      it->second(conn, data, size, result, model);
-      if (model == ExecMode::sync) {
-        if (result.size() >= MAX_BUF_LEN) {
-          result = codec.pack_args_str(
-              result_code::FAIL,
-              "the response result is out of range: more than 10M " +
-                  get_name_by_key(key));
-        }
-        conn_sp->response(req_id, std::move(result));
+        route_result.ec = router_error::no_such_function;
+      } else {
+        it->second(conn, data, result);
+        route_result.ec = router_error::ok;
       }
     } catch (const std::exception &ex) {
       msgpack_codec codec;
-      result = codec.pack_args_str(result_code::FAIL, ex.what());
-      conn_sp->response(req_id, std::move(result));
+      result = codec.pack_args_str(
+          result_code::FAIL,
+          std::string("exception occur when call").append(ex.what()));
+      route_result.ec = router_error::has_exception;
+    } catch (...) {
+      msgpack_codec codec;
+      result = codec.pack_args_str(
+          result_code::FAIL, std::string("unknown exception occur when call ")
+                                 .append(get_name_by_key(key)));
+      route_result.ec = router_error::no_such_function;
     }
+
+    route_result.result = std::move(result);
+
+    return route_result;
   }
 
   router() = default;
@@ -152,19 +154,15 @@ class router : asio::noncopyable {
     result = msgpack_codec::pack_args_str(result_code::OK, r);
   }
 
-  template <typename Function, ExecMode mode = ExecMode::sync> struct invoker {
-    template <ExecMode model>
+  template <typename Function> struct invoker {
     static inline void apply(const Function &func,
-                             std::weak_ptr<connection> conn, const char *data,
-                             size_t size, std::string &result,
-                             ExecMode &exe_model) {
+                             std::weak_ptr<connection> conn,
+                             nonstd::string_view str, std::string &result) {
       using args_tuple = typename function_traits<Function>::bare_tuple_type;
-      exe_model = ExecMode::sync;
       msgpack_codec codec;
       try {
-        auto tp = codec.unpack<args_tuple>(data, size);
+        auto tp = codec.unpack<args_tuple>(str.data(), str.size());
         call(func, conn, result, std::move(tp));
-        exe_model = model;
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       } catch (const std::exception &e) {
@@ -172,18 +170,16 @@ class router : asio::noncopyable {
       }
     }
 
-    template <ExecMode model, typename Self>
+    template <typename Self>
     static inline void apply_member(const Function &func, Self *self,
                                     std::weak_ptr<connection> conn,
-                                    const char *data, size_t size,
-                                    std::string &result, ExecMode &exe_model) {
+                                    nonstd::string_view str,
+                                    std::string &result) {
       using args_tuple = typename function_traits<Function>::bare_tuple_type;
-      exe_model = ExecMode::sync;
       msgpack_codec codec;
       try {
-        auto tp = codec.unpack<args_tuple>(data, size);
+        auto tp = codec.unpack<args_tuple>(str.data(), str.size());
         call_member(func, self, conn, result, std::move(tp));
-        exe_model = model;
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       } catch (const std::exception &e) {
@@ -192,25 +188,23 @@ class router : asio::noncopyable {
     }
   };
 
-  template <ExecMode model, typename Function>
+  template <typename Function>
   void register_nonmember_func(uint32_t key, Function f) {
     this->map_invokers_[key] = {std::bind(
-        &invoker<Function>::template apply<model>, std::move(f),
-        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3,
-        std::placeholders::_4, std::placeholders::_5)};
+        &invoker<Function>::apply, std::move(f), std::placeholders::_1,
+        std::placeholders::_2, std::placeholders::_3)};
   }
 
-  template <ExecMode model, typename Function, typename Self>
+  template <typename Function, typename Self>
   void register_member_func(uint32_t key, const Function &f, Self *self) {
     this->map_invokers_[key] = {std::bind(
-        &invoker<Function>::template apply_member<model, Self>, f, self,
-        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3,
-        std::placeholders::_4, std::placeholders::_5)};
+        &invoker<Function>::template apply_member<Self>, f, self,
+        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)};
   }
 
-  std::unordered_map<
-      uint32_t, std::function<void(std::weak_ptr<connection>, const char *,
-                                   size_t, std::string &, ExecMode &model)>>
+  std::unordered_map<uint32_t,
+                     std::function<void(std::weak_ptr<connection>,
+                                        nonstd::string_view, std::string &)>>
       map_invokers_;
   std::unordered_map<uint32_t, std::string> key2func_name_;
 };
diff --git a/include/rest_rpc/rpc_server.h b/include/rest_rpc/rpc_server.h
index 9aab7f2..28f3126 100644
--- a/include/rest_rpc/rpc_server.h
+++ b/include/rest_rpc/rpc_server.h
@@ -52,15 +52,15 @@ class rpc_server : private asio::noncopyable {
 
   void run() { io_service_pool_.run(); }
 
-  template <ExecMode model = ExecMode::sync, typename Function>
+  template <typename Function>
   void register_handler(std::string const &name, const Function &f) {
-    router_.register_handler<model>(name, f);
+    router_.register_handler(name, f);
   }
 
-  template <ExecMode model = ExecMode::sync, typename Function, typename Self>
+  template <typename Function, typename Self>
   void register_handler(std::string const &name, const Function &f,
                         Self *self) {
-    router_.register_handler<model>(name, f, self);
+    router_.register_handler(name, f, self);
   }
 
   void set_conn_timeout_callback(std::function<void(int64_t)> callback) {

From 7b7714ceb4f929b46de13857278f985f94742925 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sat, 27 Jan 2024 19:53:55 +0800
Subject: [PATCH 2/7] simplify router

---
 include/rest_rpc/router.h | 42 ++++++++++++++-------------------------
 1 file changed, 15 insertions(+), 27 deletions(-)

diff --git a/include/rest_rpc/router.h b/include/rest_rpc/router.h
index 8f7d268..bd1449c 100644
--- a/include/rest_rpc/router.h
+++ b/include/rest_rpc/router.h
@@ -154,52 +154,40 @@ class router : asio::noncopyable {
     result = msgpack_codec::pack_args_str(result_code::OK, r);
   }
 
-  template <typename Function> struct invoker {
-    static inline void apply(const Function &func,
-                             std::weak_ptr<connection> conn,
-                             nonstd::string_view str, std::string &result) {
+  template <typename Function>
+  void register_nonmember_func(uint32_t key, Function f) {
+    this->map_invokers_[key] = [f](std::weak_ptr<connection> conn,
+                                   nonstd::string_view str,
+                                   std::string &result) {
       using args_tuple = typename function_traits<Function>::bare_tuple_type;
       msgpack_codec codec;
       try {
         auto tp = codec.unpack<args_tuple>(str.data(), str.size());
-        call(func, conn, result, std::move(tp));
+        call(f, conn, result, std::move(tp));
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       } catch (const std::exception &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       }
-    }
+    };
+  }
 
-    template <typename Self>
-    static inline void apply_member(const Function &func, Self *self,
-                                    std::weak_ptr<connection> conn,
-                                    nonstd::string_view str,
-                                    std::string &result) {
+  template <typename Function, typename Self>
+  void register_member_func(uint32_t key, const Function &f, Self *self) {
+    this->map_invokers_[key] = [f, self](std::weak_ptr<connection> conn,
+                                         nonstd::string_view str,
+                                         std::string &result) {
       using args_tuple = typename function_traits<Function>::bare_tuple_type;
       msgpack_codec codec;
       try {
         auto tp = codec.unpack<args_tuple>(str.data(), str.size());
-        call_member(func, self, conn, result, std::move(tp));
+        call_member(f, self, conn, result, std::move(tp));
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       } catch (const std::exception &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
       }
-    }
-  };
-
-  template <typename Function>
-  void register_nonmember_func(uint32_t key, Function f) {
-    this->map_invokers_[key] = {std::bind(
-        &invoker<Function>::apply, std::move(f), std::placeholders::_1,
-        std::placeholders::_2, std::placeholders::_3)};
-  }
-
-  template <typename Function, typename Self>
-  void register_member_func(uint32_t key, const Function &f, Self *self) {
-    this->map_invokers_[key] = {std::bind(
-        &invoker<Function>::template apply_member<Self>, f, self,
-        std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)};
+    };
   }
 
   std::unordered_map<uint32_t,

From 11a51c69422970a6e8b1fb5f6755847e09f62643 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sat, 27 Jan 2024 20:39:08 +0800
Subject: [PATCH 3/7] improve

---
 include/rest_rpc/router.h     | 40 +++++++++++++++++++++++++++++------
 include/rest_rpc/rpc_server.h |  8 +++----
 tests/test_rest_rpc.cpp       | 13 +++++++-----
 3 files changed, 45 insertions(+), 16 deletions(-)

diff --git a/include/rest_rpc/router.h b/include/rest_rpc/router.h
index bd1449c..e4bf9b1 100644
--- a/include/rest_rpc/router.h
+++ b/include/rest_rpc/router.h
@@ -21,21 +21,45 @@ struct route_result_t {
   std::string result;
 };
 
+template <typename Tuple, bool is_pub> class helper_t {
+public:
+  helper_t(Tuple &tp) : tp_(tp) {}
+
+  void operator()() {}
+
+private:
+  Tuple &tp_;
+};
+
+template <typename Tuple> class helper_t<Tuple, true> {
+public:
+  helper_t(Tuple &tp) : tp_(tp) {}
+
+  void operator()() {
+    auto &arg = std::get<std::tuple_size<Tuple>::value - 1>(tp_);
+    msgpack_codec codec;
+    arg = codec.unpack<std::string>(arg.data(), arg.size());
+  }
+
+private:
+  Tuple &tp_;
+};
+
 class router : asio::noncopyable {
 public:
-  template <typename Function>
-  void register_handler(std::string const &name, Function f) {
+  template <bool is_pub = false, typename Function>
+  void register_handler(std::string const &name, Function f, bool pub = false) {
     uint32_t key = MD5::MD5Hash32(name.data());
     key2func_name_.emplace(key, name);
-    return register_nonmember_func(key, std::move(f));
+    return register_nonmember_func<is_pub>(key, std::move(f));
   }
 
-  template <typename Function, typename Self>
+  template <bool is_pub = false, typename Function, typename Self>
   void register_handler(std::string const &name, const Function &f,
                         Self *self) {
     uint32_t key = MD5::MD5Hash32(name.data());
     key2func_name_.emplace(key, name);
-    return register_member_func(key, f, self);
+    return register_member_func<is_pub>(key, f, self);
   }
 
   void remove_handler(std::string const &name) {
@@ -154,7 +178,7 @@ class router : asio::noncopyable {
     result = msgpack_codec::pack_args_str(result_code::OK, r);
   }
 
-  template <typename Function>
+  template <bool is_pub, typename Function>
   void register_nonmember_func(uint32_t key, Function f) {
     this->map_invokers_[key] = [f](std::weak_ptr<connection> conn,
                                    nonstd::string_view str,
@@ -163,6 +187,7 @@ class router : asio::noncopyable {
       msgpack_codec codec;
       try {
         auto tp = codec.unpack<args_tuple>(str.data(), str.size());
+        helper_t<args_tuple, is_pub>{tp}();
         call(f, conn, result, std::move(tp));
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
@@ -172,7 +197,7 @@ class router : asio::noncopyable {
     };
   }
 
-  template <typename Function, typename Self>
+  template <bool is_pub, typename Function, typename Self>
   void register_member_func(uint32_t key, const Function &f, Self *self) {
     this->map_invokers_[key] = [f, self](std::weak_ptr<connection> conn,
                                          nonstd::string_view str,
@@ -181,6 +206,7 @@ class router : asio::noncopyable {
       msgpack_codec codec;
       try {
         auto tp = codec.unpack<args_tuple>(str.data(), str.size());
+        helper_t<args_tuple, is_pub>{tp}();
         call_member(f, self, conn, result, std::move(tp));
       } catch (std::invalid_argument &e) {
         result = codec.pack_args_str(result_code::FAIL, e.what());
diff --git a/include/rest_rpc/rpc_server.h b/include/rest_rpc/rpc_server.h
index 28f3126..11fcfa0 100644
--- a/include/rest_rpc/rpc_server.h
+++ b/include/rest_rpc/rpc_server.h
@@ -52,15 +52,15 @@ class rpc_server : private asio::noncopyable {
 
   void run() { io_service_pool_.run(); }
 
-  template <typename Function>
+  template <bool is_pub = false, typename Function>
   void register_handler(std::string const &name, const Function &f) {
-    router_.register_handler(name, f);
+    router_.register_handler<is_pub>(name, f);
   }
 
-  template <typename Function, typename Self>
+  template <bool is_pub = false, typename Function, typename Self>
   void register_handler(std::string const &name, const Function &f,
                         Self *self) {
-    router_.register_handler(name, f, self);
+    router_.register_handler<is_pub>(name, f, self);
   }
 
   void set_conn_timeout_callback(std::function<void(int64_t)> callback) {
diff --git a/tests/test_rest_rpc.cpp b/tests/test_rest_rpc.cpp
index 9b7f291..f3048a5 100644
--- a/tests/test_rest_rpc.cpp
+++ b/tests/test_rest_rpc.cpp
@@ -204,11 +204,12 @@ TEST_CASE("test_client_async_call_with_timeout") {
 
 TEST_CASE("test_client_subscribe") {
   rpc_server server(9000, std::thread::hardware_concurrency());
-  server.register_handler("publish",
-                          [&server](rpc_conn conn, std::string key,
-                                    std::string token, std::string val) {
-                            server.publish(std::move(key), std::move(val));
-                          });
+  server.register_handler<true>(
+      "publish", [&server](rpc_conn conn, std::string key, std::string token,
+                           std::string val) {
+        CHECK(val == "hello subscriber");
+        server.publish(std::move(key), std::move(val));
+      });
   bool stop = false;
   std::thread thd([&server, &stop] {
     while (!stop) {
@@ -221,6 +222,8 @@ TEST_CASE("test_client_subscribe") {
   rpc_client client;
   bool r = client.connect("127.0.0.1", 9000);
   CHECK(r);
+  client.publish("key", "hello subscriber");
+
   client.subscribe("key", [&stop](string_view data) {
     std::cout << data << "\n";
     CHECK_EQ(data, "hello subscriber");

From a98f331dd170936059eb8498550f716aa97ac612 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sun, 28 Jan 2024 09:18:10 +0800
Subject: [PATCH 4/7] nonstd

---
 include/rest_rpc/cplusplus_14.h | 29 ++++++++++++++++-------------
 include/rest_rpc/meta_util.hpp  | 27 ++++++++++++++-------------
 include/rest_rpc/router.h       | 14 +++++++-------
 3 files changed, 37 insertions(+), 33 deletions(-)

diff --git a/include/rest_rpc/cplusplus_14.h b/include/rest_rpc/cplusplus_14.h
index ac95c98..6ae4298 100644
--- a/include/rest_rpc/cplusplus_14.h
+++ b/include/rest_rpc/cplusplus_14.h
@@ -7,11 +7,13 @@
 
 #if __cplusplus == 201103L
 
-namespace std {
-template <class T> struct unique_if { typedef unique_ptr<T> single_object; };
+namespace nonstd {
+template <class T> struct unique_if {
+  typedef std::unique_ptr<T> single_object;
+};
 
 template <class T> struct unique_if<T[]> {
-  typedef unique_ptr<T[]> unknown_bound;
+  typedef std::unique_ptr<T[]> unknown_bound;
 };
 
 template <class T, size_t N> struct unique_if<T[N]> {
@@ -24,7 +26,7 @@ typename unique_if<T>::single_object make_unique(Args &&...args) {
 }
 
 template <class T> typename unique_if<T>::unknown_bound make_unique(size_t n) {
-  typedef typename remove_extent<T>::type U;
+  typedef typename std::remove_extent<T>::type U;
   return unique_ptr<T>(new U[n]());
 }
 
@@ -59,20 +61,21 @@ template <typename... T>
 using index_sequence_for = make_index_sequence<sizeof...(T)>;
 
 template <bool B, class T = void>
-using enable_if_t = typename enable_if<B, T>::type;
+using enable_if_t = typename std::enable_if<B, T>::type;
 
-template <typename T> using remove_const_t = typename remove_const<T>::type;
+template <typename T>
+using remove_const_t = typename std::remove_const<T>::type;
 
 template <typename T>
-using remove_reference_t = typename remove_reference<T>::type;
+using remove_reference_t = typename std::remove_reference<T>::type;
 
 template <int I, typename T>
-using tuple_element_t = typename tuple_element<I, T>::type;
+using tuple_element_t = typename std::tuple_element<I, T>::type;
 
-template <typename T> using decay_t = typename decay<T>::type;
+template <typename T> using decay_t = typename std::decay<T>::type;
 
 template <typename F, typename Tuple, size_t... Idx>
-auto apply_helper(F &&f, Tuple &&tp, std::index_sequence<Idx...>)
+auto apply_helper(F &&f, Tuple &&tp, nonstd::index_sequence<Idx...>)
     -> decltype(std::forward<F>(f)(std::get<Idx>(std::forward<Tuple>(tp))...)) {
   return std::forward<F>(f)(std::get<Idx>(std::forward<Tuple>(tp))...);
 }
@@ -80,10 +83,10 @@ auto apply_helper(F &&f, Tuple &&tp, std::index_sequence<Idx...>)
 template <typename F, typename Tuple>
 auto apply(F &&f, Tuple &&tp) -> decltype(apply_helper(
     std::forward<F>(f), std::forward<Tuple>(tp),
-    std::make_index_sequence<std::tuple_size<decay_t<Tuple>>::value>{})) {
+    make_index_sequence<std::tuple_size<decay_t<Tuple>>::value>{})) {
   return apply_helper(
       std::forward<F>(f), std::forward<Tuple>(tp),
-      std::make_index_sequence<std::tuple_size<decay_t<Tuple>>::value>{});
+      make_index_sequence<std::tuple_size<decay_t<Tuple>>::value>{});
 }
 
 template <typename F, typename... Args>
@@ -92,7 +95,7 @@ auto invoke(F &&f, Args &&...args)
   return std::forward<F>(f)(std::forward<Args>(args)...);
 }
 
-} // namespace std
+} // namespace nonstd
 
 #endif
 
diff --git a/include/rest_rpc/meta_util.hpp b/include/rest_rpc/meta_util.hpp
index 8fb6a98..a2fe80e 100644
--- a/include/rest_rpc/meta_util.hpp
+++ b/include/rest_rpc/meta_util.hpp
@@ -8,13 +8,13 @@ namespace rest_rpc {
 
 template <typename... Args, typename Func, std::size_t... Idx>
 void for_each(const std::tuple<Args...> &t, Func &&f,
-              std::index_sequence<Idx...>) {
+              nonstd::index_sequence<Idx...>) {
   (void)std::initializer_list<int>{(f(std::get<Idx>(t)), void(), 0)...};
 }
 
 template <typename... Args, typename Func, std::size_t... Idx>
 void for_each_i(const std::tuple<Args...> &t, Func &&f,
-                std::index_sequence<Idx...>) {
+                nonstd::index_sequence<Idx...>) {
   (void)std::initializer_list<int>{
       (f(std::get<Idx>(t), std::integral_constant<size_t, Idx>{}), void(),
        0)...};
@@ -32,14 +32,15 @@ struct function_traits<Ret(Arg, Args...)> {
   typedef Ret (*pointer)(Arg, Args...);
 
   typedef std::tuple<Arg, Args...> tuple_type;
-  typedef std::tuple<std::remove_const_t<std::remove_reference_t<Args>>...>
+  typedef std::tuple<
+      nonstd::remove_const_t<nonstd::remove_reference_t<Args>>...>
       bare_tuple_type;
   using args_tuple =
       std::tuple<std::string, Arg,
-                 std::remove_const_t<std::remove_reference_t<Args>>...>;
+                 nonstd::remove_const_t<nonstd::remove_reference_t<Args>>...>;
   using args_tuple_2nd =
       std::tuple<std::string,
-                 std::remove_const_t<std::remove_reference_t<Args>>...>;
+                 nonstd::remove_const_t<nonstd::remove_reference_t<Args>>...>;
 };
 
 template <typename Ret> struct function_traits<Ret()> {
@@ -76,24 +77,24 @@ struct function_traits : function_traits<decltype(&Callable::operator())> {};
 
 template <typename T>
 using remove_const_reference_t =
-    std::remove_const_t<std::remove_reference_t<T>>;
+    nonstd::remove_const_t<nonstd::remove_reference_t<T>>;
 
 template <size_t... Is>
-auto make_tuple_from_sequence(std::index_sequence<Is...>)
+auto make_tuple_from_sequence(nonstd::index_sequence<Is...>)
     -> decltype(std::make_tuple(Is...)) {
   std::make_tuple(Is...);
 }
 
 template <size_t N>
 constexpr auto make_tuple_from_sequence()
-    -> decltype(make_tuple_from_sequence(std::make_index_sequence<N>{})) {
-  return make_tuple_from_sequence(std::make_index_sequence<N>{});
+    -> decltype(make_tuple_from_sequence(nonstd::make_index_sequence<N>{})) {
+  return make_tuple_from_sequence(nonstd::make_index_sequence<N>{});
 }
 
 namespace detail {
 template <class Tuple, class F, std::size_t... Is>
 void tuple_switch(const std::size_t i, Tuple &&t, F &&f,
-                  std::index_sequence<Is...>) {
+                  nonstd::index_sequence<Is...>) {
   (void)std::initializer_list<int>{
       (i == Is &&
        ((void)std::forward<F>(f)(std::integral_constant<size_t, Is>{}), 0))...};
@@ -102,14 +103,14 @@ void tuple_switch(const std::size_t i, Tuple &&t, F &&f,
 
 template <class Tuple, class F>
 inline void tuple_switch(const std::size_t i, Tuple &&t, F &&f) {
-  constexpr auto N = std::tuple_size<std::remove_reference_t<Tuple>>::value;
+  constexpr auto N = std::tuple_size<nonstd::remove_reference_t<Tuple>>::value;
 
   detail::tuple_switch(i, std::forward<Tuple>(t), std::forward<F>(f),
-                       std::make_index_sequence<N>{});
+                       nonstd::make_index_sequence<N>{});
 }
 
 template <int N, typename... Args>
-using nth_type_of = std::tuple_element_t<N, std::tuple<Args...>>;
+using nth_type_of = nonstd::tuple_element_t<N, std::tuple<Args...>>;
 
 template <typename... Args>
 using last_type_of = nth_type_of<sizeof...(Args) - 1, Args...>;
diff --git a/include/rest_rpc/router.h b/include/rest_rpc/router.h
index e4bf9b1..d9c4d06 100644
--- a/include/rest_rpc/router.h
+++ b/include/rest_rpc/router.h
@@ -119,7 +119,7 @@ class router : asio::noncopyable {
 
   template <typename F, size_t... I, typename... Args>
   static typename std::result_of<F(std::weak_ptr<connection>, Args...)>::type
-  call_helper(const F &f, const std::index_sequence<I...> &,
+  call_helper(const F &f, const nonstd::index_sequence<I...> &,
               std::tuple<Args...> tup, std::weak_ptr<connection> ptr) {
     return f(ptr, std::move(std::get<I>(tup))...);
   }
@@ -129,8 +129,8 @@ class router : asio::noncopyable {
       F(std::weak_ptr<connection>, Args...)>::type>::value>::type
   call(const F &f, std::weak_ptr<connection> ptr, std::string &result,
        std::tuple<Args...> tp) {
-    call_helper(f, std::make_index_sequence<sizeof...(Args)>{}, std::move(tp),
-                ptr);
+    call_helper(f, nonstd::make_index_sequence<sizeof...(Args)>{},
+                std::move(tp), ptr);
     result = msgpack_codec::pack_args_str(result_code::OK);
   }
 
@@ -139,7 +139,7 @@ class router : asio::noncopyable {
       F(std::weak_ptr<connection>, Args...)>::type>::value>::type
   call(const F &f, std::weak_ptr<connection> ptr, std::string &result,
        std::tuple<Args...> tp) {
-    auto r = call_helper(f, std::make_index_sequence<sizeof...(Args)>{},
+    auto r = call_helper(f, nonstd::make_index_sequence<sizeof...(Args)>{},
                          std::move(tp), ptr);
     msgpack_codec codec;
     result = msgpack_codec::pack_args_str(result_code::OK, r);
@@ -149,7 +149,7 @@ class router : asio::noncopyable {
   static
       typename std::result_of<F(Self, std::weak_ptr<connection>, Args...)>::type
       call_member_helper(const F &f, Self *self,
-                         const std::index_sequence<Indexes...> &,
+                         const nonstd::index_sequence<Indexes...> &,
                          std::tuple<Args...> tup,
                          std::weak_ptr<connection> ptr =
                              std::shared_ptr<connection>{nullptr}) {
@@ -162,7 +162,7 @@ class router : asio::noncopyable {
   call_member(const F &f, Self *self, std::weak_ptr<connection> ptr,
               std::string &result, std::tuple<Args...> tp) {
     call_member_helper(f, self,
-                       typename std::make_index_sequence<sizeof...(Args)>{},
+                       typename nonstd::make_index_sequence<sizeof...(Args)>{},
                        std::move(tp), ptr);
     result = msgpack_codec::pack_args_str(result_code::OK);
   }
@@ -173,7 +173,7 @@ class router : asio::noncopyable {
   call_member(const F &f, Self *self, std::weak_ptr<connection> ptr,
               std::string &result, std::tuple<Args...> tp) {
     auto r = call_member_helper(
-        f, self, typename std::make_index_sequence<sizeof...(Args)>{},
+        f, self, typename nonstd::make_index_sequence<sizeof...(Args)>{},
         std::move(tp), ptr);
     result = msgpack_codec::pack_args_str(result_code::OK, r);
   }

From 6b2694116ff99764f278e0daf4572b15ba4e957f Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sun, 28 Jan 2024 09:23:59 +0800
Subject: [PATCH 5/7] fix compile

---
 include/rest_rpc/cplusplus_14.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/rest_rpc/cplusplus_14.h b/include/rest_rpc/cplusplus_14.h
index 6ae4298..c01a7c7 100644
--- a/include/rest_rpc/cplusplus_14.h
+++ b/include/rest_rpc/cplusplus_14.h
@@ -22,12 +22,12 @@ template <class T, size_t N> struct unique_if<T[N]> {
 
 template <class T, class... Args>
 typename unique_if<T>::single_object make_unique(Args &&...args) {
-  return unique_ptr<T>(new T(forward<Args>(args)...));
+  return std::unique_ptr<T>(new T(forward<Args>(args)...));
 }
 
 template <class T> typename unique_if<T>::unknown_bound make_unique(size_t n) {
   typedef typename std::remove_extent<T>::type U;
-  return unique_ptr<T>(new U[n]());
+  return std::unique_ptr<T>(new U[n]());
 }
 
 template <class T, class... Args>

From eb959542d14f9d7d0b2619111545c79af6e843e7 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sun, 28 Jan 2024 09:25:31 +0800
Subject: [PATCH 6/7] compile

---
 include/rest_rpc/cplusplus_14.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/rest_rpc/cplusplus_14.h b/include/rest_rpc/cplusplus_14.h
index c01a7c7..0eb841e 100644
--- a/include/rest_rpc/cplusplus_14.h
+++ b/include/rest_rpc/cplusplus_14.h
@@ -22,7 +22,7 @@ template <class T, size_t N> struct unique_if<T[N]> {
 
 template <class T, class... Args>
 typename unique_if<T>::single_object make_unique(Args &&...args) {
-  return std::unique_ptr<T>(new T(forward<Args>(args)...));
+  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
 }
 
 template <class T> typename unique_if<T>::unknown_bound make_unique(size_t n) {

From 706a38b5ac1bfd41a4dbf713ec3ec5cb964c9f43 Mon Sep 17 00:00:00 2001
From: qicosmos <qicosmos@linux.alibaba.com>
Date: Sun, 28 Jan 2024 09:50:47 +0800
Subject: [PATCH 7/7] compile

---
 include/rest_rpc/cplusplus_14.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/include/rest_rpc/cplusplus_14.h b/include/rest_rpc/cplusplus_14.h
index 0eb841e..cda912a 100644
--- a/include/rest_rpc/cplusplus_14.h
+++ b/include/rest_rpc/cplusplus_14.h
@@ -5,8 +5,6 @@
 #include <tuple>
 #include <type_traits>
 
-#if __cplusplus == 201103L
-
 namespace nonstd {
 template <class T> struct unique_if {
   typedef std::unique_ptr<T> single_object;
@@ -97,6 +95,4 @@ auto invoke(F &&f, Args &&...args)
 
 } // namespace nonstd
 
-#endif
-
 #endif // REST_RPC_CPLUSPLUS_14_H_