CODEWITHSUNDEEP
c++multithreadingtbb
mskb
mskb

Reputation: 350

Intel tbb parallel_for: pass class member function with parameters?

Is it possible to pass a class member function (with parameters) to parallel_for? Something along the lines: 

void classT::A(const tbb::blocked_range<std::size_t>& r,b) {}

void classT::B(e,f,g) { 
   tbb::parallel_for( blocked_range<size_t>(0,n), <need to call A with parameter b, 
                                                                       along with r> ) 
}

Upvotes: 2

Views: 1567

Answers (1)

Vincent
Vincent

Reputation: 646

Look at this example.

They create a class and suply the class with a all the parameters needed. In that class is also a operator() which does an oppertion on the data. The parallel_for is then called with a instance of that class.

parallel_for(blocked_range<int>(0, nElements, 100), ArraySummer( p_A, p_B, p_SUM_TBB ) ); 
//The class is arraysummer

How you could do it : 

class ClassTACaller
{
   int* m_parameter;
   ClassT* m_Tinstance

public:

   ClassTACaller(ClassT* tinstance, int* param):m_parameter(param), m_Tinstance(tinstance){}
   void operator() ( const blocked_range<int>& r ) const 
   {
      m_Tinstance->A(r, param);
   }
};

parallel_for(blocked_range<int>(0, nElements, 100), ClassTACaller(&classTinstance, &x));

Upvotes: 1

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