Would you like to officially create a request ticket for those three member functions, at https://svn.boost.org/trac/boost/newticket ?
Done.
// Would not compile, trying to pass an optional<T> rvalue! if( !optional_move( t, TryToGetT () ) { // ... other way to get t ... }
The following would compile though, even if optional<T>::optional_move_to(T&) is non-const:
if( ! TryToGetT().optional_move_to(t) { // ... other way to get t ... }
Thank you for educating me! Just for overview: struct S; void change( S& s ) {} struct S { bool m_b; void func() { change( *this ); } }; change( S() ); // does not compile S().func(); // compiles S().m_b=true; // does not compile (!) I found this interesting: struct T; void change( T& s ) {} struct T { // makes R-values non-const operator S&() { return *this; } }; change( S() ); // compiles S const s; change( s ); // does not compile Do you know if any of this will change with C++0x? I know about rvalue references, but will any of the above change as well? Arno -- Dr. Arno Schoedl · aschoedl@think-cell.com Technical Director think-cell Software GmbH · Invalidenstr. 34 · 10115 Berlin, Germany http://www.think-cell.com · phone +49-30-666473-10 · toll-free (US) +1-800-891-8091 Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl · Amtsgericht Charlottenburg, HRB 85229