Gennadiy Rozental wrote:
"Jonathan Turkanis" <technews@kangaroologic.com> wrote in message
It does exist actually:
callback0( callback0 const& rhs ) : m_impl( rhs.m_impl ) {}
This code works for MSVC 6.5 and MSVC 7.1. I do not have 7.0 at the moment? Could you try to see what could be done? I will try to check it myself, once I have an access to the compiler.
Okay here is a fix. For VC7.0, the copy constructor can simply be conditionally removed. I assume the same should be done for the higher-arity callbacks. So a conservative solution would be: #if !BOOST_WORKAROUND(BOOST_MSVC, == 1300) callback0( callback0 const& rhs ) : m_impl( rhs.m_impl ) {} #endif However, I believe this copy constructor is unnecessary, since it is identical to the compiler generated copy-constructor, and the presence of the templated constructor should not inhibit the compiler-generated constructor. However, some broken compilers may not generate a copy-constructor in this case. I know that VC6 is one of them. So you could do #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) callback0( callback0 const& rhs ) : m_impl( rhs.m_impl ) {} #endif and similarly for the higher arities. I tested the second solution on VC6, VC7.0, VC7.1, GCC 3.4, Intel 8.0 (Windows), Codewarrior 8.3 and Borland 5.6.4. Jonathan