feat: allow for custom io_service (#390) (#391)

* feat: allow for custom io_service (#390)

* Keep default constructor

---------

Co-authored-by: Joan Marcè i Igual <jmigual@users.noreply.github.com>

src/internal/sio_client_impl.cpp

@@ -31,7 +31,7 @@ using namespace std;
 namespace sio
 {
     /*************************public:*************************/
-    client_impl::client_impl() :
+    client_impl::client_impl(client_options const& options) :
         m_ping_interval(0),
         m_ping_timeout(0),
         m_network_thread(),
@@ -47,7 +47,11 @@ namespace sio
         m_client.set_access_channels(alevel::connect|alevel::disconnect|alevel::app);
 #endif
         // Initialize the Asio transport policy
-        m_client.init_asio();
+        if (options.io_context != nullptr) {
+            m_client.init_asio(options.io_context);
+        } else {
+            m_client.init_asio();
+        }
 
         // Bind the clients we are using
         using std::placeholders::_1;

src/internal/sio_client_impl.h

@@ -62,7 +62,7 @@ namespace sio
             con_closed
         };
 
-        client_impl();
+        client_impl(client_options const& options);
 
         ~client_impl();
 

src/sio_client.cpp

@@ -12,8 +12,10 @@ using std::stringstream;
 
 namespace sio
 {
-    client::client():
-        m_impl(new client_impl())
+    client::client() : m_impl(new client_impl({})) {}
+
+    client::client(client_options const& options):
+        m_impl(new client_impl(options))
     {
     }
 

src/sio_client.h

@@ -11,9 +11,17 @@
 #include "sio_message.h"
 #include "sio_socket.h"
 
+namespace asio {
+    class io_context;
+}
+
 namespace sio
 {
     class client_impl;
+
+    struct client_options {
+        asio::io_context* io_context = nullptr;
+    };
 
     class client {
     public:
@@ -32,6 +40,7 @@ namespace sio
         typedef std::function<void(std::string const& nsp)> socket_listener;
 
         client();
+        client(client_options const& options);
         ~client();
 
         //set listeners and event bindings.