Re: [boost] Re: is_convertible corner case

[Howard Hinnant]

On Friday, January 24, 2003, at 09:12  PM, Howard Hinnant wrote:

struct A
{
private:
   A(const A&);
};

struct B
: A
{
};

char test[is_convertible<B, A>::value];

On Metrowerks this gives:

Error   : illegal access from 'A' to protected/private member
'A::A(const A &)'
(instantiating: 'is_convertible<B, A>')
main.cpp line 14   tatic const bool value =
sizeof(is_convertible_helper<U>::test(make<T>())) == 1;

Sorry, my example (from memory) was inaccurate:

#include <msl_utility>

struct A
{
};

struct B
{
private:
B(const B&);
};

char test[!Metrowerks::is_convertible<B, A>::value];

Error : illegal access from 'B' to protected/private member 'B::B(const B &)'
(instantiating: 'Metrowerks::is_convertible<B, A>')
msl_utility line 472 tatic const bool value = sizeof(is_convertible_helper<U>::test(make<T>())) == 1;

Haven't tried it with boost::is_convertible, but I suspect it would have the same problem.

-Howard

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