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  1.     #include <bitset>
  2.     #include <iostream>
  3.  
  4.     std::bitset<128> 
  5.     starch_32 (const std::bitset<32> &input)
  6.     {
  7.     	std::bitset<128> output;
  8.  
  9.         for (size_t i = 0; i < input.size(); ++i) {
  10.             // If `input[N]` is `true`, set `output[N*4, N*4+4]` to true.
  11.             if (input.test (i)) {
  12.                 const size_t output_index = i * 4;
  13.  
  14.                 output.set (output_index);
  15.                 output.set (output_index + 1);
  16.                 output.set (output_index + 2);
  17.                 output.set (output_index + 3);
  18.             }
  19.         }
  20.  
  21.         return output;
  22.     }
  23.  
  24.     // Example with 0xC. 
  25.     int main() {
  26.         std::bitset<32> input{0xcf00};
  27.  
  28.         auto result = starch_32 (input);
  29.  
  30.         std::cout << std::hex << result.to_ullong() << "\n";
  31.     }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin 
Standard input is empty
stdout 
ff00ffff00000000
https://ideone.com/z3HtTD
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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