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  1.  
  2. struct itostr_helper {
  3.     static unsigned out[10000];
  4.  
  5.     itostr_helper() {
  6.         for (int i = 0; i < 10000; i++) {
  7.             unsigned v = i;
  8.             char * o = (char*)(out + i);
  9.             o[3] = v % 10 + '0';
  10.             o[2] = (v % 100) / 10 + '0';
  11.             o[1] = (v % 1000) / 100 + '0';
  12.             o[0] = (v % 10000) / 1000;
  13.             if (o[0]) o[0] |= 0x30;
  14.             else if (o[1] != '0') o[0] |= 0x20;
  15.             else if (o[2] != '0') o[0] |= 0x10;
  16.             else o[0] |= 0x00;
  17.         }
  18.     }
  19. };
  20. unsigned itostr_helper::out[10000];
  21.  
  22. itostr_helper hlp_init;
  23.  
  24. template <typename T>
  25. std::string itostr(T o) {
  26.     typedef itostr_helper hlp;
  27.  
  28.     unsigned blocks[3], *b = blocks + 2;
  29.     blocks[0] = o < 0 ? ~o + 1 : o;
  30.     blocks[2] = blocks[0] % 10000; blocks[0] /= 10000;
  31.     blocks[2] = hlp::out[blocks[2]];
  32.  
  33.     if (blocks[0]) {
  34.         blocks[1] = blocks[0] % 10000; blocks[0] /= 10000;
  35.         blocks[1] = hlp::out[blocks[1]];
  36.         blocks[2] |= 0x30303030;
  37.         b--;
  38.     }
  39.  
  40.     if (blocks[0]) {
  41.         blocks[0] = hlp::out[blocks[0] % 10000];
  42.         blocks[1] |= 0x30303030;
  43.         b--;
  44.     }
  45.  
  46.     char* f = ((char*)b);
  47.     f += 3 - (*f >> 4);
  48.  
  49.     char* str = (char*)blocks;
  50.     if (o < 0) *--f = '-';
  51.     return std::string(f, (str + 12) - f);
  52. }
  53.  
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https://ideone.com/GkPcy
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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