Re: [boost] [range] adaptors vs. rvalue to lvalue& binding

Arno Schödl wrote:

ideally I would like to use range-adapted lvalue ranges like any other lvalue ranges. Writing it down naively, as below, does not compile because LoadRefRange takes (and should take?) the range it modifies by lvalue&, while adaptor expressions are rvalues.

template<typename Range> void modifies_range( Range& rng );

<snip>

Any thoughts?

You can use something like this: template <typename Range> typename boost::enable_if< // Check whether // `typename range_reference<typename remove_reference<Range>::type>::type` // is non-const reference

::type modify_range(Range&& rng) { /* … */ }

Regards, Michel