pointers - C++ std::array to vector of shared_ptr -

what idiomatic way convert it?

std::array<sometype,size> arr;  std::vector<shared_ptr<sometype>> vec;  // <--- want fill pointers                                         //      items in arr 

second question - possible create shared_ptr objects in stack-allocated array ? pointer targets "freed" once vec destroyed?

edit

i need this

class element {   element *next; }  class group {   std::vector<element*> elems; }  int main() {   ...    std::array<element,10> elems = {...};   std::array<group,4> groups = {...};    // shuffle elems , assign groups; set next-pointers in elems:   //  group1: &elem10   //  group2: &elem8 &elem5   //  group3: &elem2 &elem7 &elem3   //  group4: &elem4 &elem9 &elem1 &elem6    // @ point:   //  save or load elems , groups,   //  preserving pointers elem->elem, group->elem } 

if want shared_ptr object, should ensure object managed shared_ptr. playing games dangerous , can lead undefined behaviour. in case, trick manage array shared_ptr. let retrieve valid shared_ptr of elements.

auto elems = std::make_shared<std::array<element,10>>(); 

you can use shared_ptr's aliasing constructor create shared_ptrs individual elements. if want stick shared_ptrs in vector, this:

std::vector<std::shared_ptr<element>> v; v.reserve(elems->size());  std::transform(   elems->begin(),   elems->end(),   std::back_inserter(v),   [&elems] (element& e) { return std::shared_ptr<element>{ elems, &e }; }); 

note 1 (possibly unintended) consequence of entire elements array continue exist long have shared_ptr 1 of members.