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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class Shape
  5. {
  6. public:
  7.     virtual ~Shape() {}
  8.  
  9.     virtual double getArea() const = 0;
  10.     virtual double getPerimeter() const = 0;
  11.     virtual void print() const = 0;
  12. };
  13.  
  14. bool sortByArea(Shape* first, Shape* second)
  15. {
  16.     if(first == NULL || second == NULL)
  17.     {
  18.         return false;
  19.     }
  20.     return (first->getArea() < second->getArea());
  21. }
  22.  
  23. constexpr bool perimeterBiggerThan20(Shape* s)
  24. {
  25.     if(!s)
  26.     {
  27.     	return false;    
  28.     }
  29.     return (s->getPerimeter() > 20);
  30. }
  31.  
  32. int main() {
  33. 	// your code goes here
  34. 	return 0;
  35. }
Compilation error #stdin compilation error #stdout 0s 15240KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘constexpr bool perimeterBiggerThan20(Shape*)’:
prog.cpp:30:1: error: expression ‘Shape::getPerimeter’ is not a constant-expression
 }
 ^
stdout
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Standard output is empty
https://ideone.com/Ah61Kc
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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