我希望创建一个可变参数模板函数,它位于 QtConcurrent::run 函数的前面,该函数执行一些操作,然后传递参数。
QtConcurrent::run 严重超载 - 查看qtconcurrentrun.h
是否可以创建一个我可以调用的可变参数模板函数,该函数将传递给 QtConcurrent::run ?这是我迄今为止所拥有的:
template <typename returnT, typename... Args>
static auto Run(Args&&... args) -> QFuture<returnT>
{
// Do Stuff
// Now call through to start the task
QFuture<returnT> future = QtConcurrent::run(std::forward<Args>(args)...);
QFutureWatcher<void>* futureWatcher = new QFutureWatcher<void>(); //A QFutureWatcher<void> is special, see QFutureWatcher QT docs.
futureWatcher->setFuture(future);
QObject::connect(futureWatcher, &QFutureWatcher<void>::finished, [=]() {
// Do stuff
futureWatcher->deleteLater();
});
return future;
}
我正在努力研究如何推断返回类型,所以我将 returnT 作为单独的模板参数。当使用以下命令调用时,这不会编译(VS2012 Nov CTP):
Tasking::TaskManager::Run<void>([&]() { while (stopTask == false); });
最重要的几个错误消息是:
1> error C2065: '<lambda_86e0f4508387a4d4f1dd8316ce3048ac>' : undeclared identifier
1> Implementation\TaskingTests\TaskManagerTests.cpp(31) : see reference to function template instantiation 'QFuture<void> Tasking::TaskManager::Run<void,TaskManagerTests::WaitsForTaskTest::<lambda_86e0f4508387a4d4f1dd8316ce3048ac>>(TaskManagerTests::WaitsForTaskTest::<lambda_86e0f4508387a4d4f1dd8316ce3048ac> &&)' being compiled
1>C:\tkbt\Launch2.0.0\ICDE\IceLibrary\Implementation\Tasking/TaskManager.hpp(108): error C2974: 'std::forward' : invalid template argument for '_Ty', type expected
1> C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\type_traits(1780) : see declaration of 'std::forward'
1> C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\type_traits(1774) : see declaration of 'std::forward'
1>C:\tkbt\Launch2.0.0\ICDE\IceLibrary\Implementation\Tasking/TaskManager.hpp(108): error C2780: 'QFuture<T> QtConcurrent::run(const Class *,T (__cdecl Class::* )(Param1,Param2,Param3,Param4,Param5) const,const Arg1 &,const Arg2 &,const Arg3 &,const Arg4 &,const Arg5 &)' : expects 7 arguments - 0 provided
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtconcurrent\qtconcurrentrun.h(333) : see declaration of 'QtConcurrent::run'
非常感谢任何帮助。