Sean Huang wrote:
The following simple problem produces an error when compiling with VC8+SP1 on Windows:
#include <vector> #include <boost/range/sub_range.hpp>
int main(int argc, char* argv[]) { typedef std::vector< int > VectorType; VectorType v; boost::sub_range< VectorType > range; boost::sub_range< VectorType > range1; range = range1; return 0; }
sub_range copy-constructor is broken under msvc. (BTW, a singular(uninitialized) sub_range can't be assigned to another.) I've ever looked into this problem. See: The implicitly-defined coyp-constructor shall be something like this: sub_range(sub_range const &from) : super(static_cast<super const &>(from)) // calls "normal" copy-constructor of super type. { } But I guess msvc8(maybe also msvc7.1) generates: sub_range(sub_range const &from) : super(from) // overload resolution of super type constructors kicks in. { } super type(iterator_range) doesn't know the sub_range type. Now sub_range is const-qualified, hence it can't be copied to mutable iterators. Ditto copy-assignment operator. The workaround is to write copy-constructor/assignment "by hand". In fact, this can't explain the exact behavior of msvc. My sub_range seems to work well, though. Regards, -- Shunsuke Sogame