fix compile

examples/client/main.cpp

@@ -218,13 +218,13 @@ void test_echo() {
 
   {
     // safe call, same with `client.call<std::string>("echo", "test")`
-    auto result = client.call<echo>("test");
+    auto result = client.call_s<echo>("test");
     std::cout << result << std::endl;
   }
 
   {
     // safe call member function
-    auto result = client.call<&dummy::add>(1, 2);
+    auto result = client.call_s<&dummy::add>(1, 2);
     std::cout << result << std::endl;
   }
 

include/rest_rpc/io_context_pool.hpp

@@ -12,7 +12,7 @@ public:
 
     for (size_t i = 0; i < pool_size; i++) {
       auto io_ctx = std::make_shared<asio::io_context>();
-      works_.push_back(asio::io_context::work(*io_ctx));
+      works_.push_back(asio::make_work_guard(*io_ctx));
       io_contexts_.emplace_back(io_ctx);
     }
   }
@@ -47,7 +47,8 @@ public:
 
 private:
   std::vector<std::shared_ptr<asio::io_context>> io_contexts_;
-  std::vector<asio::io_context::work> works_;
+  std::vector<asio::executor_work_guard<asio::io_context::executor_type>>
+      works_;
   std::once_flag run_flag_;
   std::once_flag stop_flag_;
   std::atomic<size_t> next_ = 0;

include/rest_rpc/rpc_client.hpp

@@ -254,7 +254,7 @@ public:
     return call<DEFAULT_TIMEOUT, T>(rpc_name, std::forward<Args>(args)...);
   }
 
-  template <auto func, typename... Args> auto call(Args &&...args) {
+  template <auto func, typename... Args> auto call_s(Args &&...args) {
     using args_tuple = typename function_traits<decltype(func)>::tuple_type;
     static_assert(std::is_constructible_v<remove_first_t<args_tuple>, Args...>,
                   "called rpc function and arguments are not match");