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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct encoder {
  5.     uint32_t val;
  6.  
  7.     encoder(uint32_t _val = 0) : val(_val) {}
  8.  
  9.     uint32_t first(uint32_t v = 0) {
  10.         if (!v) return (val << (8*3)) >> (8*3);
  11.  
  12.         val |= v;
  13.     }
  14.  
  15.     uint32_t second(uint32_t v = 0) {
  16.         if (!v) return (val << (8*2)) >> (8*3);
  17.  
  18.         encoder _backupval(val);
  19.  
  20.         val = (val >> (8*1));
  21.         val |= v;
  22.         val = (val << (8*1));
  23.         val |= _backupval.first();
  24. 		return val;
  25.     }
  26.  
  27.     uint32_t third(uint32_t v = 0) {
  28.         if (!v) return (val << (8*1)) >> (8*3);
  29.  
  30.         encoder _backupval(val);
  31.  
  32.         val = (val >> (8*2));
  33.         val |= v;
  34.         //now restore
  35.         val = val << 8;
  36.         val |= _backupval.second();
  37.         val = val << 8;
  38.         val |= _backupval.first();
  39. 		return val;
  40.     }
  41.  
  42.     uint32_t fourth(uint32_t v = 0) {
  43.         if (!v) return (val << (8*0)) >> (8*3);
  44.  
  45.         encoder _backupval(val);
  46.  
  47.         val = (val >> (8*3));
  48.         val |= v;
  49.         //now restore
  50. 		val = val << 8;
  51.         val |= _backupval.third();
  52.         val = val << 8;
  53.         val |= _backupval.second();
  54.         val = val << 8;
  55.         val |= _backupval.first();        
  56.     }
  57. };
  58.  
  59. int main() {
  60.     encoder t;
  61.     t.first(6);
  62.     t.second(42);
  63.     t.third(212);
  64.     t.fourth(23);
  65.  
  66.     cout << "first number: " << t.first()
  67.          << "\nsecond number: " << t.second()
  68.          << "\nthird number: " << t.third()
  69.          << "\nfourth number: " << t.fourth() << endl;
  70.  
  71. }
  72.  
Success #stdin #stdout 0.02s 2680KB
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stdin
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Standard input is empty
stdout
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first number: 6
second number: 42
third number: 212
fourth number: 23
https://ideone.com/V2Y7D
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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