[sonar] "std::forward" should only be called on a forwarding reference.

[simgrid.git] / include / xbt / functional.hpp

diff --git a/include/xbt/functional.hpp b/include/xbt/functional.hpp
index 1c6983a..1fefcd8 100644 (file)
--- a/include/xbt/functional.hpp
+++ b/include/xbt/functional.hpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2018. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2015-2019. The SimGrid Team. All rights reserved.          */
 
 /* This program is free software; you can redistribute it and/or modify it
  * under the terms of the license (GNU LGPL) which comes with this package. */
@@ -26,25 +26,24 @@
 namespace simgrid {
 namespace xbt {
 
-template<class F>
-class MainFunction {
-private:
+template <class F> class MainFunction {
   F code_;
   std::shared_ptr<const std::vector<std::string>> args_;
+
 public:
-  MainFunction(F code, std::vector<std::string> args) :
-    code_(std::move(code)),
-    args_(std::make_shared<const std::vector<std::string>>(std::move(args)))
-  {}
+  MainFunction(F code, std::vector<std::string>&& args)
+      : code_(std::move(code)), args_(std::make_shared<const std::vector<std::string>>(std::move(args)))
+  {
+  }
   void operator()() const
   {
-    const int argc = args_->size();
+    const int argc                = args_->size();
     std::vector<std::string> args = *args_;
     if (not args.empty()) {
       char noarg[] = {'\0'};
       std::unique_ptr<char* []> argv(new char*[argc + 1]);
       for (int i = 0; i != argc; ++i)
-        argv[i]  = args[i].empty() ? noarg : &args[i].front();
+        argv[i] = args[i].empty() ? noarg : &args[i].front();
       argv[argc] = nullptr;
       code_(argc, argv.get());
     } else
@@ -52,14 +51,12 @@ public:
   }
 };
 
-template<class F> inline
-std::function<void()> wrapMain(F code, std::vector<std::string> args)
+template <class F> inline std::function<void()> wrap_main(F code, std::vector<std::string>&& args)
 {
   return MainFunction<F>(std::move(code), std::move(args));
 }
 
-template<class F> inline
-std::function<void()> wrapMain(F code, int argc, const char*const argv[])
+template <class F> inline std::function<void()> wrap_main(F code, int argc, const char* const argv[])
 {
   std::vector<std::string> args(argv, argv + argc);
   return MainFunction<F>(std::move(code), std::move(args));
@@ -111,29 +108,15 @@ template<class T> class Task;
  */
 template<class R, class... Args>
 class Task<R(Args...)> {
-private:
-
   // Placeholder for some class type:
   struct whatever {};
 
   // Union used for storage:
-#if 0
   typedef typename std::aligned_union<0,
     void*,
     std::pair<void(*)(),void*>,
     std::pair<void(whatever::*)(), whatever*>
   >::type TaskUnion;
-#else
-  union TaskUnion {
-    void* ptr;
-    std::pair<void(*)(),void*> funcptr;
-    std::pair<void(whatever::*)(), whatever*> memberptr;
-    char any1[sizeof(std::pair<void(*)(),void*>)];
-    char any2[sizeof(std::pair<void(whatever::*)(), whatever*>)];
-    TaskUnion() { /* Nothing to do */}
-    ~TaskUnion() { /* Nothing to do */}
-  };
-#endif
 
   // Is F suitable for small buffer optimization?
   template<class F>
@@ -189,7 +172,8 @@ public:
     vtable_ = that.vtable_;
     that.vtable_ = nullptr;
   }
-  Task& operator=(Task that)
+  Task& operator=(Task const& that) = delete;
+  Task& operator=(Task&& that)
   {
     this->clear();
     if (that.vtable_ && that.vtable_->move)
@@ -202,14 +186,13 @@ public:
   }
 
 private:
-
   template<class F>
   typename std::enable_if<canSBO<F>()>::type
   init(F code)
   {
     const static TaskVtable vtable {
       // Call:
-      [](TaskUnion& buffer, Args... args) {
+      [](TaskUnion& buffer, Args&&... args) {
         F* src = reinterpret_cast<F*>(&buffer);
         F code = std::move(*src);
         src->~F();
@@ -238,7 +221,7 @@ private:
   {
     const static TaskVtable vtable {
       // Call:
-      [](TaskUnion& buffer, Args... args) {
+      [](TaskUnion& buffer, Args&&... args) {
         // Delete F when we go out of scope:
         std::unique_ptr<F> code(*reinterpret_cast<F**>(&buffer));
         return (*code)(std::forward<Args>(args)...);
@@ -261,7 +244,7 @@ public:
   operator bool() const { return vtable_ != nullptr; }
   bool operator!() const { return vtable_ == nullptr; }
 
-  R operator()(Args... args)
+  R operator()(Args&&... args)
   {
     if (vtable_ == nullptr)
       throw std::bad_function_call();
@@ -273,7 +256,6 @@ public:
 
 template<class F, class... Args>
 class TaskImpl {
-private:
   F code_;
   std::tuple<Args...> args_;
   typedef decltype(simgrid::xbt::apply(std::move(code_), std::move(args_))) result_type;
@@ -288,15 +270,12 @@ public:
   }
 };
 
-template<class F, class... Args>
-auto makeTask(F code, Args... args)
--> Task< decltype(code(std::move(args)...))() >
+template <class F, class... Args> auto make_task(F code, Args... args) -> Task<decltype(code(std::move(args)...))()>
 {
   TaskImpl<F, Args...> task(std::move(code), std::make_tuple(std::move(args)...));
   return Task<decltype(code(std::move(args)...))()>(std::move(task));
 }
 
-}
-}
-
+} // namespace xbt
+} // namespace simgrid
 #endif