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  1. // Copyright 2016 <Biagio Festa>
  2. #include <iostream>
  3. #include <algorithm>
  4. #include <vector>
  5. #include <string>
  6. #include <thread>
  7. #include <cstring>
  8. #include <cassert>
  9.  
  10. void reverse_str_mt(char* str,
  11.                     const size_t len,
  12.                     const size_t id_thread,
  13.                     const size_t max_num_threads) {
  14.   // Some assertion on input parameters
  15.   assert(str != nullptr);
  16.   assert(max_num_threads != 0);
  17.  
  18.   // In case the num of threads is greater than the len of the string
  19.   if (id_thread > len) {
  20.     assert(max_num_threads > len);
  21.     return;
  22.   }
  23.  
  24.   // Swap operation
  25.   for (size_t i = id_thread; i <= len / 2; i += max_num_threads) {
  26.     std::swap(str[i], str[len - i - 1]);
  27.   }
  28. }
  29.  
  30. int main(int argc, char *argv[]) {
  31.   static constexpr size_t NUM_THREADS = 10;
  32.   char str[] = "123456";
  33.   const auto len = strlen(str);
  34.  
  35.   std::vector<std::thread> threads;
  36.   for (size_t i = 0; i < NUM_THREADS; ++i) {
  37.     threads.emplace_back(reverse_str_mt, str, len , i, NUM_THREADS);
  38.   }
  39.  
  40.   // Join threads
  41.   for (auto& t : threads) {
  42.     t.join();
  43.   }
  44.  
  45.   std::cout << str << std::endl;
  46.   return 0;
  47. }
  48.  
  49.  
Success #stdin #stdout 0s 44424KB
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stdin 
Standard input is empty
stdout 
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https://ideone.com/12zgp4
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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