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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct Data {
  5.   size_t d_size;
  6.   double *d_data;
  7.   Data(size_t size) : d_size(size), d_data(new double[size]) {}
  8.   ~Data() { delete[] d_data; }
  9.   double &operator[](size_t i) { return d_data[i]; }
  10.  
  11.  
  12.   inline void forEach(std::function<void(Data &, size_t)> f) {
  13.     for (size_t index = 0; index != d_size; ++index)
  14.       f(*this, index);
  15.   }
  16. };
  17.  
  18.  
  19.  
  20. int main() {
  21.   Data im(50000000);
  22.   im.forEach([](Data &im, size_t i) {
  23.     im[i] = static_cast<double>(i);
  24.   });
  25.  
  26.   double sum = 0;
  27.   im.forEach([&sum](Data &im, size_t i) {
  28.     sum += im[i];
  29.   });
  30.  
  31.   std::cout << sum << '\n';
  32. }
Success #stdin #stdout 2.02s 3472KB
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stdin
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Standard input is empty
stdout
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1.25e+15
https://ideone.com/hviTwx
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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