Merge pull request #4 from hopenobug/support_cpp20

feat: 支持C++20编译

src/UtilsCtrl/ThreadPool/UThreadPool.h

@@ -65,7 +65,7 @@ public:
     template<typename FunctionType>
     auto commit(const FunctionType& func,
                 CIndex index = CGRAPH_DEFAULT_TASK_STRATEGY)
-    -> std::future<typename std::result_of<FunctionType()>::type>;
+    -> std::future<decltype(std::declval<FunctionType>()())>;
 
     /**
      * 根据优先级，执行任务
@@ -78,7 +78,7 @@ public:
     template<typename FunctionType>
     auto commitWithPriority(const FunctionType& func,
                             int priority)
-    -> std::future<typename std::result_of<FunctionType()>::type>;
+    -> std::future<decltype(std::declval<FunctionType>()())>;
 
     /**
      * 执行任务组信息

src/UtilsCtrl/ThreadPool/UThreadPool.inl

@@ -15,8 +15,8 @@ CGRAPH_NAMESPACE_BEGIN
 
 template<typename FunctionType>
 auto UThreadPool::commit(const FunctionType& func, CIndex index)
--> std::future<typename std::result_of<FunctionType()>::type> {
-    using ResultType = typename std::result_of<FunctionType()>::type;
+-> std::future<decltype(std::declval<FunctionType>()())> {
+    using ResultType = decltype(std::declval<FunctionType>()());
 
     std::packaged_task<ResultType()> task(func);
     std::future<ResultType> result(task.get_future());
@@ -43,8 +43,8 @@ auto UThreadPool::commit(const FunctionType& func, CIndex index)
 
 template<typename FunctionType>
 auto UThreadPool::commitWithPriority(const FunctionType& func, int priority)
--> std::future<typename std::result_of<FunctionType()>::type> {
-    using ResultType = typename std::result_of<FunctionType()>::type;
+-> std::future<decltype(std::declval<FunctionType>()())> {
+    using ResultType = decltype(std::declval<FunctionType>()());
 
     std::packaged_task<ResultType()> task(func);
     std::future<ResultType> result(task.get_future());