diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher.hpp
index 77efa94d4..f3c97bcce 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher.hpp
@@ -1,10 +1,10 @@
 #pragma once
 
-// pqrs::dispatcher v2.11
+// pqrs::dispatcher v2.12
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 #include "dispatcher/dispatcher.hpp"
 #include "dispatcher/object_id.hpp"
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/dispatcher.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/dispatcher.hpp
index b9e037b83..789092034 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/dispatcher.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/dispatcher.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::dispatcher` can be used safely in a multi-threaded environment.
 
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/dispatcher_client.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/dispatcher_client.hpp
index 644be366d..a012a5504 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/dispatcher_client.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/dispatcher_client.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::extra::dispatcher_client` can be used safely in a multi-threaded environment.
 
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/shared_dispatcher.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/shared_dispatcher.hpp
index b30d2a64e..0d8c06558 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/shared_dispatcher.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/shared_dispatcher.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::extra::shared_dispatcher` can be used safely in a multi-threaded environment.
 
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/timer.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/timer.hpp
index 2c8c969fc..fcdd79e0d 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/timer.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/extra/timer.hpp
@@ -2,11 +2,12 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::extra::timer` can be used safely in a multi-threaded environment.
 
 #include "dispatcher_client.hpp"
+#include <atomic>
 
 namespace pqrs {
 namespace dispatcher {
@@ -23,7 +24,8 @@ class timer final {
 public:
   timer(dispatcher_client& dispatcher_client) : dispatcher_client_(dispatcher_client),
                                                 current_function_id_(0),
-                                                interval_(0) {
+                                                interval_(0),
+                                                enabled_(false) {
   }
 
   ~timer(void) {
@@ -35,6 +37,8 @@ class timer final {
 
   void start(std::function<void(void)> function,
              duration interval) {
+    enabled_ = true;
+
     dispatcher_client_.enqueue_to_dispatcher([this, function, interval] {
       ++current_function_id_;
       function_ = function;
@@ -45,6 +49,8 @@ class timer final {
   }
 
   void stop(void) {
+    enabled_ = false;
+
     dispatcher_client_.enqueue_to_dispatcher([this] {
       ++current_function_id_;
       function_ = nullptr;
@@ -52,6 +58,10 @@ class timer final {
     });
   }
 
+  bool enabled(void) const {
+    return enabled_;
+  }
+
 private:
   // This method is executed in the dispatcher thread.
   void call_function(int function_id) {
@@ -80,6 +90,8 @@ class timer final {
   int current_function_id_;
   std::function<void(void)> function_;
   duration interval_;
+
+  std::atomic<bool> enabled_;
 };
 } // namespace extra
 } // namespace dispatcher
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/object_id.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/object_id.hpp
index 8dfe6cfc0..b80ac6c3f 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/object_id.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/object_id.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::object_id` can be used safely in a multi-threaded environment.
 
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/time_source.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/time_source.hpp
index 8b140af9b..b4ef370e6 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/time_source.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/time_source.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 // `pqrs::dispatcher::hardware_time_source` can be used safely in a multi-threaded environment.
 // `pqrs::dispatcher::pseudo_time_source` can be used safely in a multi-threaded environment.
diff --git a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/types.hpp b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/types.hpp
index a246c1c3b..0db6bb9d8 100644
--- a/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/types.hpp
+++ b/src/vendor/cget/cget/pkg/pqrs-org__cpp-dispatcher/install/include/pqrs/dispatcher/types.hpp
@@ -2,7 +2,7 @@
 
 // (C) Copyright Takayama Fumihiko 2018.
 // Distributed under the Boost Software License, Version 1.0.
-// (See http://www.boost.org/LICENSE_1_0.txt)
+// (See https://www.boost.org/LICENSE_1_0.txt)
 
 #include <chrono>