I think you are looking for something like this: std::transform( v.begin(), v.end(), std::inserter(s, s.end()), std::mem_fn(&S::i) ); On Thu, Oct 18, 2018 at 11:02 AM Robert Jones via Boost-users < boost-users@lists.boost.org> wrote:

Given

struct S { int i( ) const; }; vector<S> v; set<int> s;

I want to write (approximately)

for_each( v | transform( []( const S & s ){ return s.i( ); } ), s.emplace );

With the intention putting all the i's extracted from v into the set s. My syntax is all over the place, and I'm not sure how to express the s.emplace bit.

Also is there a better way to say the whole thing? If I were doing push_back instead of emplace there's a facility especially for that, but I guess Boost: :Range hasn't embraced emplace because range-v3 is around now.

I'm sure some of you are fluent in this stuff!

Kind Regards

Rob.

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