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Subject: [Bug c++/38020] Undiagnosed const violation in pointer conversion in CRTP context.
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------- Comment #1 from gccbugs at marcusbannerman dot co dot uk  2008-11-07 11:05 -------
I have the same problem, it is a static_cast problem not respecting const
correctness of pointers E.g.

class BaseClass {};

class someClass:public BaseClass 
{
public:
  void someFunction() {}
};

int main()
{
  //g++ (GCC) 4.1.2 (Gentoo 4.1.2 p1.1)
  //Run as g++ test.cpp
  someClass A;
  const BaseClass* ptrA(&A);

  //Should fail on compile with not const function, does not
  static_cast<const someClass*>(ptrA)->someFunction();

  //This DOES fail
  static_cast<const someClass&>(*ptrA).someFunction();

  /*Output is 
    test.cpp: In function 'int main()':
    test.cpp:16: error: passing 'const someClass' as 'this' argument of 
    'void someClass::someFunction()' discards qualifiers
  */
}


-- 

gccbugs at marcusbannerman dot co dot uk changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gccbugs at marcusbannerman
                   |                            |dot co dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38020