[Bug c++/30331] a const member function can call a non_const member function without const_cast

["hongleij at 126 dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from hongleij at 126 dot com  2006-12-30 13:46 -------
the question is : if a const member function can call a non_const member
function
without const_cast,
if fun() changed the member in A,like this:
//const_test.cpp
struct A
{
  A(unsigned int n)
  {
     aa=n;        
  }
  void const_fun() const
  {
      static_cast<A>(*this).fun();  //ok
     // fun();       //err  
  }
  void fun()
  {
     aa=78;
  }
  unsigned int aa;
};

int main()
{
    const A a(56);
    a.const_fun();
}
the sematic of bitwise constness is not confirmed.
this program is inspired from the book <Effective C++>(third edition)
Item3: use const whenever possible


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30331