Function test_smart_pointer_move_semantics

tests/test_container_helpers.h:346–362

// Test smart pointer move semantics (unique_ptr, shared_ptr, optional, variant, expected)
template<typename SmartPtr>
void test_smart_pointer_move_semantics() {
    auto ptr = make_shared_int(200);

    SmartPtr source(ptr);

    FL_REQUIRE(ptr.use_count() == 2);

    SmartPtr destination;
    destination = fl::move(source);

    // Retrieve and check value, but let it go out of scope immediately
    {
        auto retrieved = retrieve(destination);
        FL_CHECK(*retrieved == 200);
    }
    FL_CHECK(ptr.use_count() == 2);
}

// Test basic iterator support for containers with shared_ptr<int>
// Verifies: begin/end, forward iteration, const iteration, move leaves empty