Re: [boost] RC_1_30_0 compile error with SGI MIPSpro Compilers

From: Ralf W. Grosse-Kunstleve (rwgk_at_[hidden])
Date: 2003-03-05 13:54:43

The MIPSpro problems are due to a hickup in is_base_and_derived.hpp.
Here is the relevant *preprocessed* piece of code:

template <typename B, typename D>
struct bd_helper
{
    template <typename T>
    static type_traits::yes_type check(D const volatile *, T);
    static type_traits::no_type  check(B const volatile *, int);
};

template<typename B, typename D>
struct is_base_and_derived_impl2
{
    struct Host
    {
        operator B const volatile *() const;
        operator D const volatile *();
    };

    static const bool value = sizeof(bd_helper<B,D>:: check(Host(), 0)) ==
sizeof(type_traits::yes_type);

};

And here is the error:

cc-1108 CC: ERROR File =
/u1/rwgrosse/rc_1_30_0/boost/boost/type_traits/is_base_and_derived.hpp, Line =
106
  The indicated expression must have pointer-to-function type.

      static const bool value = sizeof(bd_helper<B,D> ::check(Host(), 0)) ==
sizeof(type_traits::yes_type);
                                       ^

Findings:

- Replacing "sizeof(bd_helper<B,D> ::check(Host(), 0))" by "sizeof(int)"
  leads to successful compilation.

- Removing the space before ::check doesn't make a difference.

MIPSpro is based on EDG 238. Are there known issues with "operator T"?
Ideas for a workaround are highly appreciated.

Thanks,
        Ralf

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