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What does void Enter() = 0; mean in C#?


What does void Enter() = 0; mean in C#?

By : user3042668
Date : November 28 2020, 12:01 PM
With these it helps I was reading a book when I saw virtual void enter()=0; What does the asignment do while it is not a variable? , That code is not C#, it is C++, and is the equivalent to C#
code :
abstract class MapSite
{
    public abstract void Enter();
}


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

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));
}
Void System.Threading.Monitor.Enter Error when using ILMerge

Void System.Threading.Monitor.Enter Error when using ILMerge


By : Anna Lerner
Date : March 29 2020, 07:55 AM
I wish did fix the issue. What version of the framework are you using? There is a targetplatform option you may need to set if you are using 4.0/4.5 for example.
/targetplatform:version,platformdirectory
error: argument of type ‘void* (Thread::)(void*)’ does not match ‘void* (*)(void*)’

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);});
}
.NET Interop 'Method not found: 'Void System.Threading.Monitor.Enter..

.NET Interop 'Method not found: 'Void System.Threading.Monitor.Enter..


By : Connor Hagan
Date : March 29 2020, 07:55 AM
should help you out When compiling the C# dll, it is targeting a .NET version prior to framework 4.
Make sure the setting in the compiler is targeting the correct platform version.
how does jvm enter in public static void main?

how does jvm enter in public static void main?


By : Sachin Hatvalne
Date : March 29 2020, 07:55 AM
will be helpful for those in need It is not JVM itself who invokes main method. This is rather a job of Java launcher, i.e. java.exe.
Java launcher is a small program written in C that uses regular JNI functions:
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