dhat/tests/user_histo1.cpp

   1 #include <vector>
   2 #include <cstdint>
   3 #include <iostream>
   4 #include <random>
   5 #include "dhat/dhat.h"
   6
   7 int main()
   8 {
   9    std::vector<uint8_t> vec(2000, 0);
  10    DHAT_HISTOGRAM_MEMORY(vec.data());
  11    std::mt19937 gen(42);;
  12    std::uniform_int_distribution<> index_distrib(0, 1999);
  13    std::uniform_int_distribution<> val_distrib(0, 255);
  14
  15    for (int i = 0; i < 20; ++i)
  16    {
  17       int index = index_distrib(gen);
  18       int val = val_distrib(gen);
  19       vec[index] = val;
  20       //std::cout << "wrote " << val << " to index " << index << "\n";
  21    }
  22
  23    // try to generate some warnings
  24    vec.resize(500);
  25    vec.shrink_to_fit();
  26    DHAT_HISTOGRAM_MEMORY(vec.data());
  27
  28    auto old = vec.data();
  29    vec.resize(100000);
  30    // old should have been deleted
  31    DHAT_HISTOGRAM_MEMORY(old);
  32    // and this is too big
  33    DHAT_HISTOGRAM_MEMORY(vec.data());
  34 }