Re: [Boost-users] Can not compile a program that uses typeof package by gcc?

Subject: Re: [Boost-users] Can not compile a program that uses typeof package by gcc?
From: Peng Yu (pengyu.ut_at_[hidden])
Date: 2008-10-20 15:35:12

On Mon, Oct 20, 2008 at 11:57 AM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> AMDG
>
> Peng Yu wrote:
>>
>> I'm not sure if I understand you correctly. But I got the following
>> code which still ends up with the compiler bug. Would you please give
>> me a complete working copy of the program so that I can play with it?
>>
>
> attached.

Hi,

In line 51-55 of you attached file, it says the following.

  template <typename T1, typename T2>
  Y<typename A::multiply_traits<T1, T2>::result_type>
    operator*(const Y<T1> &y, const T2 &t) {
      return Y<T1>(y.the_t() * t);
    }

This way requires that I have to explicitly say 'multiply_traits' is
from the namespace A. I wanted to use the following instead, which
does not need to specify which the namespaces T1 and T2 are. But the
following code still results in the compiler error.

  template <typename T1, typename T2>
  Y<BOOST_TYPEOF(T1() * T2())>
    operator*(const Y<T1> &y, const T2 &t) {
      return Y<T1>(y.the_t() * t);
    }

My question is not resolved. I'm attaching the source file with some
comments to avoid any confusion. Would you please take another look at
the problem?

Thanks,
Peng