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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Example {
  5. public:
  6.     int x;
  7.     int GetX() const { // GetX is a constant member function
  8.     	x = x + 1; // This causes an error
  9.     	return x;
  10.     }
  11. };
  12.  
  13. int main() {
  14. 	Example y;
  15. 	y.x = 5;
  16.  
  17. 	std::cout << y.GetX() << std::endl;
  18.  
  19. 	return 0;
  20. }
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 Example::GetX() const’:
prog.cpp:8:14: error: assignment of member ‘Example::x’ in read-only object
      x = x + 1; // This causes an error
              ^
stdout
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Standard output is empty
https://ideone.com/I854Gu
Constant Member Function Correct
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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