On 12/21/05, Richard Jennings <richard.jennings@teraview.com> wrote:
I'm stuck with a basic problem with BOOST_BITFIELD, again using BCB6 and compiling enum.cpp included with the library.
The lines: MouseKey A, B; A |= B; fail to compile with 'bitfield_base<MouseKey>::m_value is not accessible' in operator |= in bitfield.hpp.
Not sure what's intended here. It would seem that if the following function is being instantiated: void bitfield_base<MouseKey>::operator |= (const MouseKey& rhs) { m_value |= rhs.m_value; } then m_value is not accessible since it's private to bitfield_base. If rhs were of type bitfield_base then it would work.
Well this is weird. The intent is for the Boost.Operators library to see that it can take a MouseKey on the rhs and thereby generate the binary op for me. Since this method is implemented in bitfield_base, it seems that there would be no problem for it to have access to m_value. Changing bitfield_base as follows:
void operator |= (const bitfield_base<T>& rhs) { m_value |= rhs.m_value; }
If I make the return value be void, the Boost.Operators library goes nuts. I can change the rhs type I suppose, that shouldn't hurt anything. I realize I am returning a derived type, but it should be ok because the derived type doesn't have any memory associated with it; all data is in the base. -Frank