Vicente BOTET wrote:
extern std::vector get_vector_float(); BOOST_FOREACH( float f, get_vector_float() | reversed ) { ... }
But this code results in a dangling reference. ONLY a temporary iterator_range returned by `get_vector_float() | reversed` is copied (or bound to an rvalue reference in C++0x range-based for). The lifetime of `get_vector_float()` ends before the loop body begins!
Sorry if my question is innocent. Would the functional form of the adaptor work?
extern std::vector get_vector_float(); BOOST_FOREACH( float f, reverse(get_vector_float()) ) { ... }
No. `boost::adaptors::reverse(rng)` is a synonym of `rng | boost::adaptors::reversed` and so this does not work properly. Only a temporary iterator_range is copied and the lifetime of a temporary container ends before the loop body begins! Regards, Michel