[boost] [GIL] Asking for help for vc2003 compiler bug

From: Christian Henning (chhenning_at_[hidden])
Date: 2006-10-30 14:11:50

Hi there, taking the latest GIL source from their site is exposing a
tedious compiler bug with VC2003. I have been trying to find an easy
wokaround but failed. It fails in channel.hpp when trying to define
specializations for channel_min_value() and channel_max_value.

Here is the code:

template <typename T>
typename channel_traits<T>::value_type
inline channel_min_value() { return std::numeric_limits<typename
channel_traits<T>::value_type>::min(); }
template <typename T>
typename channel_traits<T>::value_type
inline channel_max_value() { return std::numeric_limits<typename
channel_traits<T>::value_type>::max(); }

template<> inline bits8 channel_min_value<bits8>() { return 0; }
template<> inline bits8 channel_max_value<bits8>() { return 255; }

template<> inline bits16 channel_min_value<bits16>() { return 0; }
template<> inline bits16 channel_max_value<bits16>() { return 32768; }

template<> inline bits32f channel_min_value<bits32f>() { return 0.0f; }
template<> inline bits32f channel_max_value<bits32f>() { return 1.0f; }

Here is the compiler error messages:

c:\gil\gil\core\channel.hpp(95) : error C2785:
'channel_traits<T>::value_type gil::channel_min_value(void)' and
'gil::bits8 gil::channel_min_value(void)' have different return types
        c:\gil\gil\core\channel.hpp(90) : see declaration of
'gil::channel_min_value'
        c:\gil\gil\core\channel.hpp(95) : see declaration of
'gil::channel_min_value'
c:\gil\gil\core\channel.hpp(95) : error C2912: explicit
specialization; 'gil::bits8 gil::channel_min_value<gil::bits8>(void)'
is not a specialization of a function template
c:\gil\gil\core\channel.hpp(95) : fatal error C1903: unable to recover
from previous error(s); stopping compilation

I have been trying to find a workaround reading some news groups
entry. But all I could find are conformations that this is a bug and
that VC2005 is compiling. Not very helpful. Does anyone here at boost
know a workaround?

I have realized that this request is offtopic. Please, ignore when
feeling that my request is inappropriate.

Thanks,
Christian