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  1. #include <iostream>
  2.  
  3. constexpr size_t to_bin(const char* str, size_t i) //i is last index of string
  4. {
  5.     return i == 0 ? str[i] - '0' : str[i] - '0' + to_bin(str, i - 1) * 2;  
  6. }
  7.  
  8. constexpr size_t operator "" _bin(const char* str, size_t len)
  9. {
  10.     return to_bin(str, len - 1);
  11. }
  12.  
  13. int main()
  14. {
  15.     std::cout << "101"_bin << std::endl;
  16. }
Success #stdin #stdout 0s 2852KB
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https://ideone.com/KHzR4E
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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