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  1. #include <iostream>
  2. #include <ostream>
  3. #include <sstream>
  4. #include <string>
  5.  
  6. using namespace std;
  7.  
  8. int level = 0;
  9. void print_indent()
  10. {
  11.     cout << string(level*4,' ');
  12. }
  13.  
  14. class Integer
  15. {
  16.     string name;
  17. public:
  18.     Integer()
  19.     {
  20.         static int counter = 0;
  21.         stringstream ss;
  22.         ss << "var" << (++counter);
  23.         name = ss.str();
  24.         print_indent();
  25.         cout << "int " << name << "=0;" << endl;
  26.     }
  27.     Integer &operator++()
  28.     {
  29.         print_indent();
  30.         cout << "++" << name << ";" << endl;
  31.         return *this;
  32.     }
  33.     Integer &operator=(const Integer &rhs)
  34.     {
  35.         print_indent();
  36.         cout << name << "=" << rhs.name << ";" << endl;
  37.         return *this;
  38.     }
  39. };
  40. class Block
  41. {
  42.     bool done;
  43. public:
  44.     Block()
  45.         : done(false)
  46.     {
  47.         print_indent();
  48.         cout << "{" << endl;
  49.         ++level;
  50.     }
  51.     bool next()
  52.     {
  53.         return !done;
  54.     }
  55.     void after()
  56.     {
  57.         --level;
  58.         print_indent();
  59.         cout << "}" << endl;
  60.         done = true;
  61.     }
  62. };
  63.  
  64. #define BLOCK for(Block b##__LINE__;b##__LINE__.next();b##__LINE__.after())
  65.  
  66. int main()
  67. {
  68.     BLOCK {
  69.         Integer a,b;
  70.         a=b;
  71.         ++a;
  72.         Integer c;
  73.         BLOCK
  74.             a=b=c;
  75.         ++b;
  76.         BLOCK {
  77.             b=++a;
  78.             c=++a;
  79.         }
  80.     }
  81. }
Success #stdin #stdout 0s 3040KB
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{
    int var1=0;
    int var2=0;
    var1=var2;
    ++var1;
    int var3=0;
    {
        var2=var3;
        var1=var2;
    }
    ++var2;
    {
        ++var1;
        var2=var1;
        ++var1;
        var3=var1;
    }
}
https://ideone.com/qQ4Pvo
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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