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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <stdint.h>
  5. #include <random>
  6. #include <time.h>
  7. #include <string.h>
  8. #include <chrono>
  9.  
  10. using namespace std;
  11. uint64_t itr  = 1000000;//10 Billion
  12. int len = 100;
  13.  
  14. class Timer {
  15.   std::chrono::steady_clock::time_point start;
  16.   std::chrono::steady_clock::time_point stop;
  17. public:
  18.   Timer(){
  19.     start = std::chrono::steady_clock::now();
  20.     stop = std::chrono::steady_clock::now();
  21.   }
  22.   virtual ~Timer() {}
  23.  
  24.   inline void begin() {
  25.     start = std::chrono::steady_clock::now();
  26.   }
  27.  
  28.   inline void end() {
  29.     stop = std::chrono::steady_clock::now();
  30.   }
  31.  
  32.   inline double elapsedMillis() {
  33.     return std::chrono::duration_cast<std::chrono::milliseconds>(stop - start).count();
  34.   }
  35.  
  36.   inline double elapsedMicro() {
  37.     return std::chrono::duration_cast<std::chrono::microseconds>(stop - start).count();
  38.   }
  39.  
  40.   inline double elapsedNano() {
  41.     return std::chrono::duration_cast<std::chrono::nanoseconds>(stop - start).count();
  42.   }
  43.  
  44.   inline double elapsedSec() {
  45.     auto diff = stop - start;
  46.     return std::chrono::duration<double> (diff).count();
  47.   }
  48. };
  49.  
  50. int main(int argc) {
  51.   string s[] = { {len,argc+'A'}, {len,argc+'A'}, {len, argc+'B'}, {len, argc+'B'} };
  52. std::cout << "s[0] " << s[0] << '\n';
  53.   uint64_t a = 0;
  54.   Timer t;
  55. for (int x = 0; x < 2; ++x)
  56. {
  57.   t.begin();
  58.   for(uint64_t i =0;i<itr;i++){
  59.     if(s[i&3] == s[(i+1)&3])
  60.       a += i;
  61.   }
  62.   t.end();
  63.  
  64.   cout<<"==       took:"<<t.elapsedMillis()<<endl;
  65.  
  66.   t.begin();
  67.   for(uint64_t i =0;i<itr;i++){
  68.     if(s[i&3].compare(s[(i+1)&3])==0)
  69.       a += i;
  70.   }
  71.   t.end();
  72.  
  73.   cout<<".compare took:"<<t.elapsedMillis()<<endl;
  74.  
  75.   t.begin();
  76.   for(uint64_t i =0;i<itr;i++){
  77.     if(strcmp(s[i&3].c_str(),s[(i+1)&3].c_str()))
  78.       a += i;
  79.   }
  80.   t.end();
  81.  
  82.   cout<<"strcmp   took:"<<t.elapsedMillis()<<endl;
  83. }
  84.   if (a == 42) std::cout << "huh?\n";
  85. }
Success #stdin #stdout 0.12s 3232KB
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stdin
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Standard input is empty
stdout
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s[0] dB
==       took:21
.compare took:21
strcmp   took:14
==       took:21
.compare took:25
strcmp   took:14
https://ideone.com/rGc36a
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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