The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Use a reference when a function requires a valid object and should keep referring to that object; use a pointer when “no object” is possible, the target may change, or explicit pointer operations are needed. Neither a reference nor a raw pointer, by itself, communicates ownership.
What is the difference between a reference and a pointer?
Both let code access an object located elsewhere, but C++ gives them different semantics. Microsoft Learn describes a reference as something that, like a pointer, stores an object’s address; unlike a pointer, an initialized reference cannot be changed to refer to another object or set to null. A pointer is a variable that stores an object’s memory address and can hold a null value.
| Feature | Reference | Pointer |
|---|---|---|
| Initialization | Must be initialized to designate an object. Microsoft Learn | Can hold an object’s address or a null value. Microsoft Learn |
| Can it be redirected? | No. It remains bound to the object it designated when initialized. | Yes. Its stored address can be changed. |
| Access syntax | Use ordinary object syntax, such as ref.member. |
Dereference it to access the object, such as ptr->member or (*ptr).member. |
| Can it represent absence? | No—not as a valid initialized reference. | Yes. A null pointer can represent “no object.” |
| Arithmetic and traversal | References do not support pointer arithmetic. | Pointer arithmetic is available where valid, including traversal within an array’s range. cppreference |
| Indirection types | You cannot form a pointer to a reference or an array of references. Template reference collapsing is a separate rule. cppreference | Pointer-to-pointer types, such as T**, are valid. |
| Ownership | Does not express ownership or guarantee the object’s lifetime. | A raw pointer also does not safely express ownership; use a smart pointer when ownership is intended. Microsoft Learn |
When should you use a reference?
Use a reference when the function needs an object, rather than an optional object, and does not need to change which object it designates. For example:
void print(const std::string& text);
This parameter requires a string reference and prevents the function from modifying the string through that parameter. A const T& is also commonly used to avoid copying an argument. A reference does not extend the lifetime of every object it refers to, so the caller must ensure the object remains alive for the duration of its use.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
When should you use a pointer?
Choose a pointer when the API needs to express an optional target, redirect the target, or perform operations that specifically require pointers. Microsoft Learn lists allocating heap objects, passing functions to other functions, and iterating through arrays or other data structures among common pointer uses.
- Optional input: a null pointer can indicate that no object was supplied. The function should document and handle that state.
- Changeable target: assign a different address to the pointer when it needs to designate a different object.
- Low-level traversal or indirection: use pointers where pointer arithmetic or pointer-to-pointer forms are genuinely required, while respecting the valid range of the underlying objects.
How do references and pointers behave when assigned?
Assigning through a reference changes the referenced object’s value; it does not bind the reference to a different object. For example, after int& ref = first;, the statement ref = second; copies second’s value into first. The reference still designates first.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Assigning a pointer is different: it changes the address stored in the pointer. If int* ptr = &first;, then ptr = &second; makes ptr designate second.
What if a function needs to change the caller’s pointer?
One option is to pass a reference to the pointer:
void setPointer(int*& ptr, int& target) { ptr = ⌖ }
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteRank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
The parameter int*& is a reference to an int*, so assigning to ptr changes the caller’s pointer. A pointer-to-pointer parameter can also provide this double indirection, but uses a different call syntax. Microsoft Learn demonstrates the functional relationship between these approaches. Microsoft Learn: References to pointers
Are raw pointers still used in modern C++?
Yes, but a raw pointer should not be mistaken for an ownership-management tool. It remains useful for non-owning access and low-level operations. When code is responsible for owning a dynamically allocated object, use an appropriate smart pointer or other ownership facility instead of relying on a raw pointer to signal responsibility. Microsoft Learn warns that raw pointers can be a source of serious errors and points to smart pointers and related facilities.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Is a reference always a pointer internally?
That is not the right way to define a reference. C++ specifies reference behavior—such as binding to an object and not being reseatable—not a universal memory layout. A compiler may implement that behavior in a particular way, but implementation details are not a substitute for the language semantics.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
