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#include <iostream>
#include <cassert>
class Printer {
    static int count;
public:
    static Printer* create() {
        return (count == 0) ? ++count, new Printer : 0;
    }
    ~Printer() {--count;}
private:
    Printer() {}
    Printer(const Printer&);
public:
      void print() {std::cout<<"I am a printer"<<std::endl;}
};
 
int Printer::count = 0;
 
int main() {
    Printer* p1 = Printer::create();
    assert(p1);
    Printer* p2 = Printer::create();
    assert(!p2);
    delete p1;
    Printer* p3 = Printer::create();
    assert(p3);
    p3->print();
    Printer p4(*p3);
    delete p3;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:28:19: error: ‘Printer::Printer(const Printer&)’ is private within this context
     Printer p4(*p3);
                   ^
prog.cpp:12:5: note: declared private here
     Printer(const Printer&);
     ^~~~~~~

Standard output is empty