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  1. #include <iostream>
  2. #include <cassert>
  3. class Printer {
  4.     static int count;
  5. public:
  6.     static Printer* create() {
  7.         return (count == 0) ? ++count, new Printer : 0;
  8.     }
  9.     ~Printer() {--count;}
  10. private:
  11.     Printer() {}
  12. public:
  13.       void print() {std::cout<<"I am a printer"<<std::endl;}
  14. };
  15.  
  16. int Printer::count = 0;
  17.  
  18. int main() {
  19.     Printer* p1 = Printer::create();
  20.     assert(p1);
  21.     Printer* p2 = Printer::create();
  22.     assert(!p2);
  23.     delete p1;
  24.     Printer* p3 = Printer::create();
  25.     assert(p3);
  26.     p3->print();
  27.     Printer p4(*p3);
  28.     delete p3;
  29. }
  30.  
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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I am a printer
https://ideone.com/JihPLc
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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