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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. class cls
  5. {int x;
  6. public: 
  7.     cls(int i=3) {x=i;}
  8.  
  9.     int &f() const{ return x;}
  10. };
  11. int main()
  12. {
  13.     const cls a(-3);
  14.     int b=a.f();
  15.     cout<<b;
  16.     return 0;
  17. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In member function 'int& cls::f() const':
prog.cpp:9:28: error: binding 'const int' to reference of type 'int&' discards qualifiers
     int &f() const{ return x;}
                            ^
stdout
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Standard output is empty
https://ideone.com/C7iIyn
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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