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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <functional>
  4. #include <random>
  5. #include <iterator>
  6. #include <type_traits>
  7.  
  8. template <typename T>
  9. void f()
  10. {
  11.     if(!std::is_same<int, T>::value && !std::is_same<double, T>::value)
  12.     {
  13.         std::cerr << "Wrong template type" << std::endl;
  14.         return ;
  15.     }
  16.     const std::size_t N = 2;
  17.     const std::size_t M = 4;
  18.     const std::size_t LEN = M * N;
  19.     T arr[M][N];
  20.  
  21.     std::mt19937 gen { std::random_device()() };
  22.     std::uniform_real_distribution<> dist(static_cast<T>(1),static_cast<T>(9));
  23.     //or if(std::is_same<int, T>::value) int_distribution else real_distribution
  24.  
  25.     std::generate(&arr[0][0], &arr[0][0] + LEN, [&]{ return dist(gen); });
  26.  
  27.     for(std::size_t i = 0; i < M; ++i)
  28.     {
  29.         for(std::size_t j = 0; j < N; ++j)
  30.             std::cout << arr[i][j] << ' ';
  31.         std::cout << std::endl;
  32.     }
  33.  
  34.     std::cout << "Mul: "
  35.               << std::accumulate(&arr[0][0],&arr[0][0] + LEN,static_cast<T>(1),std::multiplies<T>())
  36.               << std::endl;
  37. }
  38.  
  39. int main(int argc, char *argv[])
  40. {
  41.     f<int>(); //or f<double>();
  42. }
Success #stdin #stdout 0s 3276KB
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stdin
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Standard input is empty
stdout
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2 4 
3 3 
7 8 
2 8 
Mul: 64512
https://ideone.com/MvUAbG
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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