Re: [boost] Workaround for Metrowerks overloading problem?

From: Daniel Wallin (dalwan01_at_[hidden])
Date: 2003-09-15 00:57:26

At 06:46 2003-09-15, Eric Friedman wrote:
>Boosters,
>
>I posted some time ago about what seemed to be a bug in Metrowerks's
>CodeWarrior 8.3 compiler that was standing in the way of complete
>functionality of the upcoming Variant library (namely reference content for
>variants). I have not yet found a workaround, but I have more precisely
>identified the problem.
>
>The problem can be reproduced by attempting to compile the code shown below.
>Note that this code successfully compiles on at least the following
>compilers: MSVC 7.1, gcc 2.95 and up, Borland 5.51, and Comeau 4.3 and up.
>
>Any help would be greatly appreciated. Also, it might be worthwhile
>introducing a new defect macro to the config library.

How about this:

template<class T>
struct enable_if_nonconst
{
    typedef void* type;
};

template<class T>
struct enable_if_nonconst<const T> {};

   struct test_t
   {
       template <typename T>
       test_t(T&, typename enable_if_nonconst<T>::type p = 0)
       {
       }

       template <typename T>
       test_t(const T&)
       {
       }
   };

>Thanks,
>Eric
>---
>
>   struct test_t
>   {
>       template <typename T>
>       test_t(T&)
>       {
>       }
>
>       template <typename T>
>       test_t(const T&)
>       {
>       }
>   };
>
>   void test_impl(test_t)
>   {
>   }
>
>   template <typename T>
>   void test()
>   {
>       T t;
>
>       T & x = t;
>       test_impl(x);
>
>       T const & cx = x;
>       test_impl(cx); // CW8.3: compile error here
>   }
>
>   int main()
>   {
>       test< int >();
>       return 0;
>   }
>
>
>
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---
Daniel Wallin