[boost] optional/type_with_alignment.hpp vs. metrowerks 8.3 PPC CFM

From: Mat Marcus (mmarcus-boost_at_[hidden])
Date: 2003-09-02 12:36:27

We're trying to use optional from 1.30.0 (sorry legal hasn't approved 
our use of 1.30.2 yet). However on one compiler (Metrowerks 8.3 PPC 
CFM) we're getting static asserts from the alignment calculation 
metafunctions. Below is an abstracted example of the problem. I'm 
curious about what's going on and what workarounds might be possible.

Thanks,
Mat

#include <utility>
#include "boost/optional.hpp"

boost::optional<std::pair<double, double> > foo;

/*
Error   : illegal use of incomplete struct/union/class 
'boost::STATIC_ASSERTION_FAILURE<0>'
 (instantiating: 'boost::optional<std::pair<double, double>>')
  (instantiating: 
'boost::optional_detail::aligned_storage<std::pair<double, double>>')
   (instantiating: 
'boost::optional_detail::aligned_storage<std::pair<double, 
double>>::dummy_u')
    (instantiating: 'boost::type_with_alignment<8>')
type_with_alignment.hpp line 109   BOOST_STATIC_ASSERT(found >= Align);

Error   : illegal use of incomplete struct/union/class 
'boost::STATIC_ASSERTION_FAILURE<0>'
 (instantiating: 'boost::optional<std::pair<double, double>>')
  (instantiating: 
'boost::optional_detail::aligned_storage<std::pair<double, double>>')
   (instantiating: 
'boost::optional_detail::aligned_storage<std::pair<double, 
double>>::dummy_u')
    (instantiating: 'boost::type_with_alignment<8>')
type_with_alignment.hpp line 110   BOOST_STATIC_ASSERT(found % Align 
== 0);

*/