#include "boost/optional.hpp"
#include <experimental/optional>

using Optional_t = boost::optional<int>; // Emits warning
//using Optional_t = std::experimental::optional<int>; // Works fine

struct A
{
    A(const Optional_t& iOptional)
        :_optional(iOptional)
    {}

    Optional_t _optional;
};

const Optional_t& getAnOptional();

void useA(A&);

void someFunction(const void* iSomeData)
{
    Optional_t aOptional;

    if (iSomeData)
    {
        aOptional = getAnOptional();
    }

    A* aA = new A(aOptional);
    useA(*aA);
}