Re: [boost] operators.hpp / GCC 3.0 / empty base class optimization

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-07-25 12:36:28

Did you report this at http://gcc.gnu.org/cgi-bin/gnatsweb.pl

-Dave
----- Original Message -----
From: <helmut.zeisel_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Wednesday, July 25, 2001 1:11 PM
Subject: [boost] operators.hpp / GCC 3.0 / empty base class optimization

> There seems to be a bug w.r.t. the
> empty base class optimization in GCC 3.0
> which makes operators.hpp more or less unuseable:
>
> "c++ mytest.cpp; a.out" compiled with GCC 3.0 / Linux crashes.
> "c++ -DNONEMPTY mytest.cpp; a.out" works.
>
> Helmut
>
>      class empty_base
>      {
>      #ifdef NONEMPTY
>        int i;
>      #endif
>      };
>
>      template <class T, class B = empty_base>
>      struct multipliable1 : B
>      {
>           friend T operator*(T x, const T& y) { return x *= y; }
>      };
>
>      class A : multipliable1<A >
>      {
>      public:
>        A(int n) {m_v.push_back(0);}
>
>        A& operator*=(const A& other) {return *this;}
>      private:
>        std::vector<int> m_v;
>      };
>
>
>      int main()
>

>        A a(1);
>        A(1)*A(1);
>        a=1;
>        return 0;
>      }
>
>
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