cube is a class that from what i know can be both constexpr and not and for some reason c.get() is not constexpr because the second cout prints 5 which mean it changed the value of c to 5 instead of c.get() always returning 1.
class cube
{
private:
int roll;
public:
constexpr cube(const int& r) :roll(r) {}
void set(int const& a) { roll = a; }
constexpr int get() const { return roll; }
constexpr void fun() const
{
(const_cast <cube*> (this))->roll = 5;
}
};
int main()
{
constexpr cube c(1);
std::cout << "Old roll number: " << c.get() << std::endl;
c.fun();
std::cout << "New roll number: " << c.get() << std::endl;
return 0;
}
EDIT: in the comments some said that the fun() breaks it but here it's still not constexpr as you can see here gcc.godbolt.org/z/zoz7KEqqn
#include<iostream>
class cube
{
private:
int roll;
public:
constexpr cube(const int& r) :roll(r) {}
void set(int const& a) { roll = a; }
constexpr int get() const { return roll; }
};
int main()
{
constexpr cube c(1);
std::cout << "Old roll number: " << c.get() << std::endl;
std::cout << "New roll number: " << c.get() << std::endl;
return 0;
}
