Function construct_from_shared_ptr

include/pybind11/detail/init.h:250–267

template <typename PtrType, typename Class>
void construct_from_shared_ptr(value_and_holder &v_h,
                               std::shared_ptr<PtrType> &&shd_ptr,
                               bool need_alias) {
    static_assert(std::is_same<PtrType, Cpp<Class>>::value
                      || std::is_same<PtrType, const Cpp<Class>>::value,
                  "Expected (const) Cpp<Class> as shared_ptr pointee");
    auto *ptr = shd_ptr.get();
    no_nullptr(ptr);
    if (Class::has_alias && need_alias && !is_alias<Class>(ptr)) {
        throw type_error("pybind11::init(): construction failed: returned std::shared_ptr pointee "
                         "is not an alias instance");
    }
    // Cast to non-const if needed, consistent with internal design
    auto smhldr
        = smart_holder::from_shared_ptr(std::const_pointer_cast<Cpp<Class>>(std::move(shd_ptr)));
    v_h.value_ptr() = const_cast<Cpp<Class> *>(ptr);
    v_h.type->init_instance(v_h.inst, &smhldr);
}

template <typename Class, detail::enable_if_t<is_smart_holder<Holder<Class>>::value, int> = 0>
void construct(value_and_holder &v_h, std::shared_ptr<Cpp<Class>> &&shd_ptr, bool need_alias) {