Re: [boost] Re: [Formal review] Singleton library - bcc32 5.6.4 error

From: Jason Hise (chaos_at_[hidden])
Date: 2005-05-05 09:13:11

Russell Hind wrote:

> Pavel Vozenilek wrote:
>
>>
>> The library is known to work with several newer compilers,
>> VC7.1 among them. Help with other compilers is welcomed.
>>
>
> I've tried it with bcc32 5.6.4 and just #include <boost/singleton.hpp> 
> leads to these errors.  If anyone has any ideas on this then I'd be 
> happy to try them out.
>
> Cheers
>
> Russell
>
> [C++ Error] dependency_lifetime.hpp(119): E2402 Illegal base class 
> type: formal type 
> 'leaky_lifetime_ex<CreationFlags,Creator,Lock>::lifetime<Type>' 
> resolves to 
> 'leaky_lifetime_ex<1,create_using_new,unlocked>::lifetime<Type>'
> [C++ Error] dependency_lifetime.hpp(61): E2402 Illegal base class 
> type: formal type 'typename 
> leaky_lifetime_ex<CreationFlags,Creator,Lock>::lifetime<Type>::pointer' 
> resolves to 'typename 
> leaky_lifetime_ex<1,create_using_new,unlocked>::lifetime<Type>::pointer'
> [C++ Error] longevity_registry.hpp(45): E2029 
> 'singleton_ex<longevity_registry,dependency_lifetime>' must be a 
> previously defined class or struct

The previous line makes me worry that CRTP will not work on your 
compiler.  CRTP is a major foundation for the library, so if it doesn't 
work it may not be possible to find a work around.  Does the following 
compile?

template < typename Type >
struct Base
{
    Type * ptr;
};

struct Derived : public Base < Derived >
{
};

> [C++ Error] longevity_registry.hpp(80): E2247 
> 'longevity_registry::node::longevity' is not accessible
> [C++ Error] longevity_registry.hpp(80): E2247 
> 'longevity_registry::node::longevity' is not accessible
> [C++ Error] longevity_registry.hpp(81): E2247 
> 'longevity_registry::node::longevity' is not accessible
> [C++ Error] longevity_registry.hpp(81): E2247 
> 'longevity_registry::node::longevity' is not accessible
> [C++ Error] longevity_registry.hpp(81): E2247 
> 'longevity_registry::node::creation_index' is not accessible
> [C++ Error] longevity_registry.hpp(81): E2247 
> 'longevity_registry::node::creation_index' is not accessible
> [C++ Error] longevity_registry.hpp(66): E2288 Pointer to structure 
> required on left side of -> or ->*

These might be the result of some compiler problem with friends inside 
templated classes.  See if this compiles:

template < typename Type >
class Outer
{
private:
    typedef Type some_type;

    class Inner
    {
        typename Outer < Type >::some_type inner;
    } inner;

    friend class Inner;
};

int main (  )
{
    Outer < int > test;
    return 0;
}

-Jason