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What is the difference between int (*cmp)(void) and int *cmp(void)?


By : ljj
Date : August 01 2020, 04:00 AM
To fix this issue What is the difference between
code :
extern int (*func)(void);
extern int *func(void);


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How to convert void (__thiscall MyClass::* )(void *) to void (__cdecl *)(void *) pointer


By : user2844509
Date : March 29 2020, 07:55 AM
help you fix your problem You can't.
You should use a static function instead (not a static member function, but a free function).
code :
// 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));
}

Difference between void foo(T y) and <T> void foo(T y) in Java generic class


By : corvino
Date : March 29 2020, 07:55 AM
will be helpful for those in need Explain in detail the difference, if any, between the following two versions of a Java generic class?
code :
class C<T>{
    T x;
    <T> void foo(T y)  { … }
}
class C<T>{
    T x;
    <S> void foo(S y)  { … }
}
class C<T>{
    T x;
    <T> void foo(T y)  { x = y; }
}
class C<T>{
    T x;
    <S> void foo(S y)  { x = y; }
}

cannot convert '*void(MyClass::*)(void*) to void*(*)(void*) in pthread_create function


By : Ahò Jàck Comàndêr
Date : March 29 2020, 07:55 AM
Any of those help i'm trying to create a new thread with a class "CameraManager" but i have the following error: ,
I don't want to declare dequeueLoop as a static function
code :
static void * dequeueEntry(void * self) {
    return static_cast<CameraManager*>(self)->dequeueLoop();
}

dequeueThreadId = pthread_create(
    &dequeueThread, NULL, 
    &CameraManager::dequeueEntry, // <-- pointer to trampoline function
    this);                        // <-- pointer to object for member function
std::thread thread(&CameraManager::dequeLoop, this);

error: argument of type ‘void* (Thread::)(void*)’ does not match ‘void* (*)(void*)’


By : ADI POLAK
Date : March 29 2020, 07:55 AM
it fixes the issue pthread_create is a C function, and knows nothing of C++ member functions. You'll need to give it a static or non-member function, and pass a pointer to your Thread object via the final argument of pthread_create; something like:
code :
class Thread
{
    virtual void* run(void *params) = 0;

    void start(void * params)
    {
        this->params = params;
        pthread_create(&threadId, 0, &Thread::static_run, this);
    }

    static void * static_run(void * void_this)
    {
         Thread * thread_this = static_cast<Thread*>(void_this);
         return thread_this->run(thread_this->params);
    }

private:
    pthread_t threadId;
    void *params;
};
std::thread thread;

void start(void * params)
{
    thread = std::thread([this]{run(params);});
}

C# How to declare the void to void?Cannot implicitly convert type 'void' to 'void'


By : SPT
Date : March 29 2020, 07:55 AM
this will help Sorry,I need explain my initial goal. I need dynamic call the different void in different class.
code :
model.AfterAuditVoid() = ad.WorkListVoid();
object.Equals() = 0;
String.Join("") = 0;
Int32.Parse("") = 0;
public String MyProperty { get; set; }
...
obj.MyProperty = "MyValue";
obj.MyProperty = ad.WorkListVoid();
public class WorkListEntity
{
  public string Formid { get; set; }
  //change to an action (e.g. in lambda terms, this would be () => {} - no parameters and no outputs
  public Action AfterAuditVoid { get; set; }
}
var model = new WorkListEntity()
model.Formid="1";
model.AfterAuditVoid = ad.WorkListVoid;
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