Why is the Loki library not more widely used?

Why is the Loki library not more widely used?

By : Ben C
Date : October 21 2020, 11:12 PM
hope this fix your issue Loki is a research/proof-of-concept sort of thing. Alexandrescu pushes new ideas, other people adopt those for real world. Also boost::shared_ptr is almost literally in TR1.
code :

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How do I create an nullary Functor in C++ (using the loki library)

How do I create an nullary Functor in C++ (using the loki library)

By : Glum
Date : March 29 2020, 07:55 AM
will be helpful for those in need Looking at the source code, the Functor template definition is as follows:
code :
template <typename R = void, class TList = NullType,
        template<class, class> class ThreadingModel = LOKI_DEFAULT_THREADING_NO_OBJ_LEVEL>
    class Functor{...};
typedef Functor<> BitButtonPushHandler;
Is there a widely used library of patterns & interfaces for .NET 3.5?

Is there a widely used library of patterns & interfaces for .NET 3.5?

By : pepos
Date : March 29 2020, 07:55 AM
seems to work fine Castle Project
ActiveRecord - Active Record pattern implementation leveraging NHibernate ActiveWriter - Visual Design Environment for NHibernate or ActiveRecord Windsor IoC Container MonoRail MVC Framework DynamicProxy
Strange memory problem of Loki::Singleton, Loki::SmartPtr, and std::vector

Strange memory problem of Loki::Singleton, Loki::SmartPtr, and std::vector

By : Padawan
Date : March 29 2020, 07:55 AM
hop of those help? As you're using VC, you should be able to run your code in debug mode, step by stp (F10,F11) to see where it breaks.
Anyway, looking at the Loki singleton code, it seems that the error comes from the assert in SingletonHolder::DestroySingleton() :
code :
 SingletonHolder<T, CreationPolicy, L, M, X>::DestroySingleton()
00837     {
00838         assert(!destroyed_); // there, but it's a wild guess
00839         CreationPolicy<T>::Destroy(pInstance_);
00840         pInstance_ = 0;
00841         destroyed_ = true;
00842     }
00800     template
00801     <
00802         class T,
00803         template <class> class CreationPolicy,
00804         template <class> class LifetimePolicy,
00805         template <class, class> class ThreadingModel,
00806         class MutexPolicy
00807     >
00808     void SingletonHolder<T, CreationPolicy, 
00809         LifetimePolicy, ThreadingModel, MutexPolicy>::MakeInstance()
00810     {
00811         typename ThreadingModel<SingletonHolder,MutexPolicy>::Lock guard;
00812         (void)guard;
00814         if (!pInstance_)
00815         {
00816             if (destroyed_)
00817             {
00818                 destroyed_ = false;
00819                 LifetimePolicy<T>::OnDeadReference();
00820             }
00821             pInstance_ = CreationPolicy<T>::Create();
00822             LifetimePolicy<T>::ScheduleDestruction(pInstance_, // here
00823                 &DestroySingleton);
00824         }
00825     }
understanding STATIC_CHECK in Loki library

understanding STATIC_CHECK in Loki library

By : supernoob
Date : March 29 2020, 07:55 AM
help you fix your problem We have specialization for class CompileTimeError, that has default constructor. Instanciations of other cases will cause error, that CompileTimeError is undefined type (in your case we trying to create variable ERROR_Destination_Type_Too_Narrow of type CompileTimeError). (void)VariableName is only silence of -Wunused
Is there a widely used multiprocessing abstraction library available for c++?

Is there a widely used multiprocessing abstraction library available for c++?

By : jvnlendm
Date : March 29 2020, 07:55 AM
To fix this issue OpenMP (Open Multi-Processing) is the only library I know of http://en.wikipedia.org/wiki/OpenMP -- it does not however, handle things the way Python does by creating new processes. OpenMP is a compiler extension, supported by Microsoft and GNU GCC.
Example: OpenMP sieve of eratosthenes
code :
// odd-only sieve
int eratosthenesOdd(int lastNumber, bool useOpenMP)
  // enable/disable OpenMP
  omp_set_num_threads(useOpenMP ? omp_get_num_procs() : 1);
  // instead of i*i <= lastNumber we write i <= lastNumberSquareRoot to help OpenMP
  const int lastNumberSqrt = (int)sqrt((double)lastNumber);
  int memorySize = (lastNumber-1)/2;
  // initialize
  char* isPrime = new char[memorySize+1];
  #pragma omp parallel for
  for (int i = 0; i <= memorySize; i++)
    isPrime[i] = 1;
  // find all odd non-primes
  #pragma omp parallel for schedule(dynamic)
  for (int i = 3; i <= lastNumberSqrt; i += 2)
    if (isPrime[i/2])
      for (int j = i*i; j <= lastNumber; j += 2*i)
        isPrime[j/2] = 0;
  // sieve is complete, count primes
  int found = lastNumber >= 2 ? 1 : 0;
  #pragma omp parallel for reduction(+:found)
  for (int i = 1; i <= memorySize; i++)
    found += isPrime[i];
  delete[] isPrime;
  return found;
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