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  1. #include <iostream>
  2. #include <thread>
  3. #include <vector>
  4.  
  5. int countFactors (long l) { return 0; }
  6.  
  7. void thrMain(const std::vector<long>& list, std::vector<int>& result,
  8.     const int startInd, const int endInd)
  9. {
  10.    for (int i = startInd; (i < endInd); i++)
  11.    {
  12.        result[i] = countFactors(list[i]);
  13.    }
  14. }
  15.  
  16. std::vector<int> getFactorCount(const std::vector<long>& numList, const int thrCount)
  17. {
  18.    // First allocate the return vector
  19.    const int listSize = numList.size();
  20.    const int count = (listSize / thrCount) + 1;
  21.    std::vector<std::thread> thrList;  // List of threads
  22.    // Store factorial counts
  23.    std::vector<int> factCounts(numList.size());
  24.    for (int start = 0, thr = 0; (thr < thrCount); thr++, start += count) {
  25.        int end = std::max(listSize, (start + count));
  26.        thrList.push_back(std::thread(thrMain, std::ref(numList), 
  27.             std::ref(factCounts), start, end));
  28.    }
  29.    for (auto& t : thrList) {
  30.        t.join();
  31.    }
  32.    // Return the result back
  33.    return factCounts;
  34. }
  35.  
  36. int main () {}
Success #stdin #stdout 0s 4552KB
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https://ideone.com/0CwbnY
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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