AMDG Lewis Hyatt <lhyatt <at> princeton.edu> writes:
The only problem with that is it would require a separate check for all different types of units in use, even though each check was conceptually doing the same thing.
I guess it would be a simple matter for the user to derive a new template from quanity<Q,T> for the sole purpose of adding the static assert, so perhaps the library itself doesn't need to be concerned with this.
How about: template<class T, class Unit, class Y> T technically_nonportable_quantity_cast(quantity<Unit, Y>& q) { BOOST_STATIC_ASSERT(sizeof(quantity<Unit, Y>) == sizeof(T)); return(reinterpret_cast<T>(q)); } template<class T, class Unit, class Y> T technically_nonportable_quantity_cast(quantity<Unit, Y>* q) { return(&technically_nonportable_quantity_cast< typename boost::remove_pointer<T>::type& >(*q)); } //overloads for const quantity In Christ, Steven Watanabe