Initializing multiset with custom comparison function in C++

Question

Consider following comparison function:

bool compare(std::shared_ptr &lhs, std::shared_ptr &rhs){
   return lhs->val         


        

Answer 1

In order to access your elements, you need to provide function for strict weak ordering for your type.

std::multiset have the following constructor:

 explicit multiset (const key_compare& comp = key_compare(),
               const allocator_type& alloc = allocator_type());

As you can see, you can do this by passing comp function pointer (or function object) to the constructor.

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