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  1. #include <benchmark/benchmark.h>
  2. #include <vector>
  3. #include <random>
  4.  
  5. using namespace std;
  6.  
  7. static void sequentialLoop (benchmark::State& state) {
  8.     int n = state.range(0);
  9.     vector<int> v(n), ord(n);
  10.     iota(ord.begin(), ord.end(), 0);
  11.  
  12.     for (auto _ : state) {
  13.         for (int i = 0; i < n; i++) v[ord[i]] = ord[i];
  14.         benchmark::DoNotOptimize(v.data());
  15.         benchmark::ClobberMemory();
  16.     }
  17. }
  18. BENCHMARK(sequentialLoop)->RangeMultiplier(2)->Range(1 << 4, 1 << 24);
  19.  
  20. static void randomizedLoop (benchmark::State& state) {
  21.     int n = state.range(0);
  22.     vector<int> v(n), ord(n);
  23.     iota(ord.begin(), ord.end(), 0);
  24.     shuffle(ord.begin(), ord.end(), mt19937(21));
  25.  
  26.     for (auto _ : state) {
  27.         for (int i = 0; i < n; i++) v[ord[i]] = ord[i];
  28.         benchmark::DoNotOptimize(v.data());
  29.         benchmark::ClobberMemory();
  30.     }
  31. }
  32. BENCHMARK(randomizedLoop)->RangeMultiplier(2)->Range(1 << 4, 1 << 24);
  33.  
  34. BENCHMARK_MAIN();
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:1:10: fatal error: benchmark/benchmark.h: No such file or directory
 #include <benchmark/benchmark.h>
          ^~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/GQT9mt
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
secret

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