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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <string>
  4. #include <stdexcept>
  5.  
  6. class N62
  7. {
  8. public:
  9.     explicit N62(const std::string& digits) : N62(digits.c_str(), digits.size()) {}
  10.     N62(const char* digits, std::size_t len) : value(0u)
  11.     {
  12.         for (std::size_t i = 0; i != len; ++i) {
  13.             auto pos = std::find(std::begin(base), std::end(base), digits[i]);
  14.             if (pos == std::end(base)) {
  15.                 throw std::runtime_error("bad format");
  16.             }
  17.             value *= base_size;
  18.             value += pos - std::begin(base);
  19.         }
  20.     }
  21.     N62(std::size_t value) : value(value) {}
  22.     operator std::size_t () const { return value; }
  23.     std::string str() const
  24.     {
  25.         if (value == 0u) {
  26.             return "0";
  27.         }
  28.         std::string res;
  29.         for (std::size_t n = value; n != 0; n /= base_size) {
  30.             res.push_back(base[n % base_size]);
  31.         }
  32.         std::reverse(res.begin(), res.end());
  33.         return res;
  34.     }
  35.  
  36. private:
  37.     std::size_t value;
  38. private:
  39.     static constexpr char base[] =
  40.         "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  41.     static constexpr std::size_t base_size = 62;
  42. };
  43.  
  44. std::ostream& operator << (std::ostream& os, const N62& n)
  45. {
  46.     return os << n.str() << "(" << std::size_t(n) << ")";
  47. }
  48.  
  49. constexpr char N62::base[];
  50.  
  51. N62 operator "" _n62 (const char *t, std::size_t len)
  52. {
  53.     return N62(t, len);
  54. }
  55.  
  56. int main()
  57. {
  58.     N62 a = "42"_n62;
  59.     N62 b = 42;
  60.  
  61.     std::cout << a << "*" << b << " = " << N62(a * b) << std::endl;
  62.  
  63.     return 0;
  64. }
  65.  
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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42(250)*G(42) = 2Jm(10500)
https://ideone.com/y1gZDF
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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