[英]How to convert void (__thiscall MyClass::* )(void *) to void (__cdecl *)(void *) pointer
I want to build a "IThread" class which can hide the thread creation. 我想构建一个可以隐藏线程创建的“IThread”类。 Subclass implements the "ThreadMain" method and make it called automatically which seems like this: 子类实现“ThreadMain”方法并使其自动调用,如下所示:
class IThread
{
public:
void BeginThread();
virtual void ThreadMain(void *) PURE;
};
void IThread::BeginThread()
{
//Error : cannot convert"std::binder1st<_Fn2>" to "void (__cdecl *)(void *)"
m_ThreadHandle = _beginthread(
std::bind1st( std::mem_fun(&IThread::ThreadMain), this ),
m_StackSize, NULL);
//Error : cannot convert void (__thiscall* )(void *) to void (__cdecl *)(void *)
m_ThreadHandle = _beginthread(&IThread::ThreadMain, m_StackSize, NULL);
}
I have searched around and cannot figure it out. 我四处搜寻,无法弄明白。 Is there anybody who did such thing? 有没有人做过这样的事情? Or I am going the wrong way? 或者我走错了路? TIA TIA
You can't. 你不能。
You should use a static function instead (not a static member function, but a free function). 您应该使用静态函数(不是静态成员函数,而是自由函数)。
// IThread.h
class IThread
{
public:
void BeginThread();
virtual void ThreadMain() = 0;
};
// IThread.cpp
extern "C"
{
static void __cdecl IThreadBeginThreadHelper(void* userdata)
{
IThread* ithread = reinterpret_cast< IThread* >(userdata);
ithread->ThreadMain();
}
}
void IThread::BeginThread()
{
m_ThreadHandle = _beginthread(
&IThreadBeginThreadHelper,
m_StackSize, reinterpret_cast< void* >(this));
}
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