Affordable solution to train a team and make them project ready. It checks that the object being cast is actually of the derived class type and returns a null pointer if the object is not of the desired type (unless you're casting to a reference type -- then it throws a bad_cast exception).. Use static_cast if this extra check is not necessary. From the semantics of your problem, I'd go with reinterpret, because that's what you actually do. It turns one type directly into another such as casting the value from one pointer to another, or storing a pointer in an int, or all sorts of other nasty things.Largely, the only guarantee you get with reinterpret_cast is that normally if you cast the result back to the original type, you will get the exact . dynamic_cast is only for polymorphic types. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. What are the criteria for a protest to be a strong incentivizing factor for policy change in China? Appropriate translation of "puer territus pedes nudos aspicit"? The most important thing to know is that static_cast is used to reverse implicit conversions. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. We make use of First and third party cookies to improve our user experience. Is there a database for german words with their pronunciation? It checks that the object being cast is actually of the derived class type and returns a null pointer if the object is not of the desired type (unless you're casting to a reference type -- then it throws a bad_cast exception). Possible Duplicate: An actual type-pun that directly reads the bits of p using the representation of type T* only happens when you cast to a reference type, as in reinterpret_cast(p). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The implications are that you should use, -1 for "In current C++, you can't use reinterpret_cast like in that code". So you are either doing an invalid cast or a casting back to the original type that was previously cast into a void*. Better way to check if an element only exists in one array, Examples of frauds discovered because someone tried to mimic a random sequence. By the way, there are not very many good reasons for using a void* pointer in this way in C++. Agree did anything serious ever run on the speccy? Solution 1 static_cast. static_cast only allows conversions like int to float or base class pointer to derived class pointer. Is Energy "equal" to the curvature of Space-Time? API reference; Downloads; Samples; Support If you accidentally try doing a cast that isn't well-defined, then the compiler will report an error. Use dynamic_cast when casting from a base class type to a derived class type. static_cast would be used when you certain of the types in question. but it's also unsafe because it does not use dynamic_cast. Learn more. For run-time checking, use dynamic_cast (limited to classes with RTTI). Did the apostolic or early church fathers acknowledge Papal infallibility? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It can also only be done for pointers and references. Example You should use it in cases like converting float to int, char to int, etc. (TA) Is it appropriate to ignore emails from a student asking obvious questions? Archived Forums > Visual C . Penrose diagram of hypothetical astrophysical white hole. dynamic_cast This cast is used for handling polymorphism. Find centralized, trusted content and collaborate around the technologies you use most. Use dynamic_cast when casting from a base class type to a derived class type. We make use of First and third party cookies to improve our user experience. Making statements based on opinion; back them up with references or personal experience. Which cast to use; static_cast or reinterpret_cast? Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? Typesetting Malayalam in xelatex & lualatex gives error. Why does the USA not have a constitutional court? When to use new operator in C++ and when it should not be used? dynamic_cast can only be used with pointers and references. The cast is permitted, but presumably you, @Alf the cast is not permitted. This can be useful if it is necessary to add/remove constness from a variable. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If you see the "cross", you're on the right track. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? For no checking, use reinterpret_cast. Regular cast vs. static_cast vs. dynamic_cast. What happens if you score more than 99 points in volleyball? Examples of frauds discovered because someone tried to mimic a random sequence. static_cast provided that you know (by design of your program) that the thing pointed to really is an int. It's a misconception that reinterpret_cast(p) would interpret the bits of p as if they were representing a T*. Regular functions vs Arrow functions in JavaScript? Find centralized, trusted content and collaborate around the technologies you use most. There is no conversion listed that allows, @Johannes: First, just that that's wrong: it's 5.2.10/7, combined with alignment info for void*. Visual C . Not the answer you're looking for? int a = 5, b = 2; double result = static_cast<double> (a) / b; dynamic_cast It can only be used with pointers and references to objects. CbDrawIndexed *drawCmd = reinterpret_cast<CbDrawIndexed*>(mSwIndirectBufferPtr + (size_t)cmd->indirectBufferOffset ); bufferCONST_SLOT_STARTVES_POSITION When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used in C++? static_cast is designed to reverse any implicit conversion. You can cast a pointer or reference to any polymorphic type to any other class type (a polymorphic type has at least one virtual function, declared or inherited). I disagree, since in this trivial example it is obviously known that the void* p actually points to an integer, only a static_cast is required. reinterpret_cast is the most dangerous cast, and should be used very sparingly. Regular Cast This is the most powerful cast available in C++ as it combines const_cast, static_cast and reinterpret_cast. For example, casting an int* to a double* is legal with a reinterpret_cast, though the result is unspecified. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. what you say of static_cast would actually be more correctly said of reinterpret_cast. reinterpret_cast This is the trickiest to use. [ad_1] static_cast vs dynamic_cast vs reinterpret_cast internals view on a downcast/upcast In this answer, I want to compare these three mechanisms on a concrete upcast/downcast example and analyze what happens to the underlying pointers/memory/assembly to give a concrete understanding of how they compare. The amount of code broken when it's rejected will be no fun, so there is no motivation for them to forbid it. So you will get bad object from that. Does a 120cc engine burn 120cc of fuel a minute? Connect and share knowledge within a single location that is structured and easy to search. static_cast only allows conversions like int to float or base class pointer to derived class pointer. For compile-time checking, use static_cast (limited to what the compiler knows). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? Give an example, const_cast in C++ - Type casting operators. This misses to say that dynamic_cast only works on polymorphic classes. Does integrating PDOS give total charge of a system? static_cast performs no runtime checks. I want to be able to quit Finder but can't edit Finder's Info.plist after disabling SIP. It is used for reinterpreting bit patterns and is extremely low level. dynamic_cast is generally used when resolving pointers to classes used in inheritance where you want to make sure the pointer you are casting is of the expected type. Apart, dynamic_cast will return NULL if the cast is not possible, so you can take a different decision. static_cast is similar to the old C style cast and can be applied to just about anything. Learn more, Regular cast vs. static_cast vs. dynamic_cast in C++, Regular cast vs. static_cast vs. dynamic_cast in C++ program. To be clear here, the bad design is having to cast from Base to Derived, not using dynamic_cast to do it. Solution 1. How could my characters be tricked into thinking they are on Mars? When a prvalue v of object pointer type is converted to the object pointer type "pointer to cv T", the result is static_cast<cv T*> (static_cast<cv void*> (v))." - Mircea Ispas Jun 25, 2021 at 22:29 @Human-Compiler A and B were hierarchically related, the pointer value can change as part of the cast. And the dynamic_cast is throwing error if the casting failed :) Hope this helps ! Any explanation please? rev2022.12.9.43105. On failure to cast, a null pointer is returned. You converted to void* implicitly, therefore you can (and should) convert back with static_cast if you know that you really are just reversing an earlier conversion. PHP string cast vs strval function, which one should I use? 5.2.10 Reinterpret cast, p2: reinterpret_cast constness (5. . Asking for help, clarification, or responding to other answers. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Archived Forums 421-440 > Visual C . and when i use reinterpret_cast it does the same job, casting the struct. static_cast is the cast of choice when there is a natural, intuitive conversion between two types that isn't necessarily guaranteed to work at runtime. Other Available casts. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? Dynamic cast requires RTTI and does some magic compared to static cast. reinterpret_cast const-ness, const_cast . As a native speaker why is this usage of I've so awkward? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In some contexts, like this one, "static" refers to compile-time and "dynamic" refers to run-time. Does a 120cc engine burn 120cc of fuel a minute? Obtain closed paths using Tikz random decoration on circles. you only need to use it when you're casting to a derived class. How to set a newcommand to be incompressible by justification? MOSFET is getting very hot at high frequency PWM. I'm using c function in c++, where a structure passed as a void type argument in c is directly stored that same structure type. static_cast is just a compile time cast, checks if origin class can be promoted to the casted class by some simple rules as inheritance. dynamic_cast is almost exclusively used for handling polymorphism. This is exclusively to be used in inheritence when you cast from base class to derived class. But how is the structure gets affected by using the three of them. I believe that this will give a good intuition on how those [] This can cast related type classes. Visual C . This is also the cast responsible for implicit type coersion and can also be called explicitly. How to smoothen the round border of a created buffer to make it look more natural? Among id, name, xpath and css, which locator should be used? Are there conservative socialists in the US? To learn more, see our tips on writing great answers. It is used for reinterpreting bit patterns and is extremely low level. How to say "patience" in latin in the modern sense of "virtue of waiting or being able to wait"? No other conversion can be performed explicitly using reinterpret_cast.". Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. rev2022.12.9.43105. Virtual vs Sealed vs New vs Abstract in C#. You do this when you're absolutely sure about the argument being of the target type. can be used to remove or add const to a variable. Is there a verb meaning depthify (getting more depth)? 1const_cast constconst. I agree with anon, reintepret_cast is similar to the C style cast. but it's also unsafe because it does not use dynamic_cast. When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? The reinterpret cast is more risky, since it would allow some very weird behavior in the future if somebody mucks with the code that assigns void* p. @Steve, I see, thanks for the clarification. This should be used if you know that you refer to an object of a specific type, and thus a check would be unnecessary. Check C++ type casting tutorial at cplusplus.com. If your C++ code is using some C API then of course you don't have much choice. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. @Alf plase note our conversation in the comments on this answer: @Alf 5.2.10/7 doesn't allow casting a pointer to void from or to anything. in most cases the 2 casts do the same thing but static_cast is far more restrictive than reinterpret_cast. C++ .reinterpret_cast:reinpreter_cast<type-id> (expression) reinterpret_cast,,.: int n=9; double d= reinterpret_cast< double > (n); . As far as I know, all current compilers allow to reinterpret_cast from void* and behave equivalent to the corresponding static_cast, even though it is not allowed in current C++03. For example, you can static_cast a void* to an int*, since the void* might actually point at an int*, or an int to a char, since such a conversion is meaningful. I don't recall where latter is directly specified, if it is, but it's implied by the rule for. Windows Dev Center Home ; UWP apps; Get started; Design; Develop; Publish; Resources . static cast versus dynamic cast [duplicate], Regular cast vs. static_cast vs. dynamic_cast, C++ type casting tutorial at cplusplus.com, C++ : Documentation : C++ Language Tutorial : Type Casting. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? How to set a newcommand to be incompressible by justification? Why is the federal judiciary of the United States divided into circuits? static_cast is used for cases where you basically want to reverse an implicit conversion, with a few restrictions and additions.static_cast performs no runtime checks. It's used primarily for things like turning a raw data bit stream into actual data or storing data in the low bits of an aligned pointer. You should use it in cases like converting float to int, char to int, etc. Connect and share knowledge within a single location that is structured and easy to search. For example, you can static_cast a void* to an int*, since the void* might actually point at an int*, or an int to a char, since such a conversion is meaningful. Why should fossil fuels like coal and petroleum be used judiciously. It's almost exclusively used for handling polymorphism. Solved: Regular cast vs. static_cast vs. dynamic_cast - Question: I've been writing C and C++ code for almost twenty years, but there's one aspect of these languages that I've never really understood. When casting from a void* there is not type information for the cast to work with. dynamic_cast checks information available at run-time, such as RTTI, it also traverses class hierarchies to see if such cast is possible. A static_cast is a cast from one type to another that (intuitively) is a cast that could under some circumstance succeed and be meaningful in the absence of a dangerous cast. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. static_cast: This is used for the normal/ordinary type conversion. When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? It's an error to use it with non-polymorphic classes. What is the difference between static_cast and reinterpret_cast? This is also the cast responsible for implicit type coersion and can also be called explicitly. In current C++, you can't use reinterpret_cast like in that code. For example, you can use static_cast to convert base class pointers to derived class pointers, which is a conversion that makes sense in some cases but can't be verified until runtime. For a conversion between different function type pointers or between different object type pointers you need to use reinterpret_cast. Regards, Paul McKenzie. It is used for reinterpreting bit patterns and is extremely low level. A static_cast is a cast from one type to another that (intuitively) is a cast that could under some circumstance succeed and be meaningful in the absence of a dangerous cast. This is used for the normal/ordinary type conversion. Which equals operator (== vs ===) should be used in JavaScript? ago. Ready to optimize your JavaScript with Rust? In case of static_cast<A*> (b_ptr), yes. static_cast Vs reinterpret_cast. They go into a lot of detail as to the differences between the two. If you are sure about a type and you want to cast it you will use static_cast. Regular cast vs. static_cast vs. dynamic_cast in C++, Regular cast vs. static_cast vs. dynamic_cast in C++ program. 3 mo. Not the answer you're looking for? This is exclusively to be used in inheritence when you cast from base class to derived class. This is also called as C-style cast. C-style callback interfaces can often be replaced with either a template function (for anything that resembles the standard function qsort) or a virtual interface (for anything that resembles a registered listener). dynamic_cast This cast is used for handling polymorphism. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? This should be used if you know that you refer to an object of a specific type, and thus a check would be unnecessary. Find centralized, trusted content and collaborate around the technologies you use most. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. A C-style cast is basically identical to trying out a range of sequences of C++ casts, and taking the first C++ cast that works, without ever considering dynamic_cast. This is exclusively to be used in inheritence when you cast from base class to derived class. In C++0x, reinterpret_cast(p) will be equivalent to static_cast(p). How is the merkle root verified if the mempools may be different? The rubber protection cover does not pass through the hole in the rim. It's used primarily for things like turning a raw data bit stream into actual data or storing data in the low bits of an aligned pointer. When should Capital Cash Flow (CCF) approach be used in evaluating a project? when i use Testitem *it=(Testitem *)data; this does the same thing too. My understanding of this stuff is somewhat hazy, as I only write C++ from time to time, but the basic comment stands re:static_cast being more appropriate. A C-style cast of the form (T) is defined as trying to do a static_cast if possible, falling back on a reinterpret_cast if that doesn't work. You only need to use it when you're casting to a derived class. Affordable solution to train a team and make them project ready. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? Something can be done or not a fit? You only need to use it when you're casting to a derived class. How to use a VPN to access a Russian website that is banned in the EU? which cast should be used to convert from void* to int* and why? This cast is used for handling polymorphism. static_cast This is used for the normal/ordinary type conversion. This is the trickiest to use. static_cast This is used for the normal/ordinary type conversion. When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? Is there any reason on passenger airliners not to have a physical lock between throttles? If the types are not same it will generate some error. Now if someone really wants to get a char* to a const int object, they can call, e.g., safe_alias(const_cast<int&>(x)). rev2022.12.9.43105. Neither static_cast nor reinterpret_cast can remove const from something. This can be useful if it is necessary to add/remove constness from a variable. Needless to say, this is much more powerful as it combines all of const_cast , static_cast and reinterpret_cast , but it's also unsafe, because it does not use dynamic_cast . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. For example, in cases of virtual inheritance only dynamic_cast can resolve the situation. For example, in cases of virtual inheritance only dynamic_cast can resolve the situation. Since the behavior of reinterpret_cast<T*>(p) is implementation specific for most uses, nearly all uses of reinterpret_cast<T*>(p) are a sign that the code is highly non-portable and, ideally, avoided. Now it's explicit that constness is . Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? static_cast performs no run-time checks and hence no runtime overhead. Also check out C++ : Documentation : C++ Language Tutorial : Type Casting, If you are talking about C++. Similarly, casting an int to a void* is perfectly legal with reinterpret_cast, though it's unsafe. Thanks for contributing an answer to Stack Overflow! static_cast is certainly the first option unless you specifically need dynamic_cast's functinoality. Why is apparent power not measured in Watts? static_cast is designed to reverse any implicit conversion. How do I tell if this single climbing rope is still safe for use? This is also the cast responsible for implicit type coersion and can also be called explicitly. How to smoothen the round border of a created buffer to make it look more natural? This is also called as C-style cast. How is the merkle root verified if the mempools may be different? dynamic_cast may even throw an exception at runtime. You only need to use it when you're casting to a derived class. Then static_cast is not safe type of casting. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Regular cast vs. static_cast vs. dynamic_cast static_cast static_cast is used for cases where you basically want to reverse an implicit conversion, with a few restrictions and additions. You only need to use it when you're casting to a derived class. A reinterpret_cast is a cast that represents an unsafe conversion that might reinterpret the bits of one value as the bits of another value. You cannot cast a const int* to an int* using either of these casts. It can cast to your type but if its wrong it will not throw any error/message. This is also the cast responsible for implicit type coersion and can also be called explicitly. When should static_cast, dynamic_cast and reinterpret_cast be used? For this, you would use a const_cast. You converted to void* implicitly, therefore you can (and should) convert back with static_cast if you know that you really are just reversing an earlier conversion. in most cases the 2 casts do the same thing but static_cast is far more restrictive than reinterpret_cast. static_cast performs no runtime checks. What are the criteria for a protest to be a strong incentivizing factor for policy change in China? Agree @Martin: is that a question or a statement? Dynamic casting is done at runtime, and thus requires runtime type information. Can a prospective pilot be negated their certification because of too big/small hands? Use the reinterpret_cast<> to highlight these dangerous areas in the code. Should I use static_cast or reinterpret_cast when casting a void* to whatever. By using this website, you agree with our Cookies Policy. Are the S&P 500 and Dow Jones Industrial Average securities? Example: static_cast provided that you know (by design of your program) that the thing pointed to really is an int. You do this when you're unsure about the type you have: the cast may fail, which is shown by the return value being null. This can be useful if it is . :), Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. However, you cannot static_cast an int* to a double*, since this conversion only makes sense if the int* has somehow been mangled to point at a double*. It's probably incorporated in one of the next WPs. Abstract vs Sealed Classes vs Class Members in C#. In the other hand, dynamic_cast is slower, as it implies some code being executed, and as said previously, it needs RTTI enabled which increases the size of the binaries. For example, I usually use a static_cast when casting between int and enum. - jalf Dec 1, 2008 at 21:20 3 Great answer! void* is just an ugly way of saying, "I don't know the type, but I'm going to pass the pointer on to someone else who does". Regular Cast This is the most powerful cast available in C++ as it combines const_cast, static_cast and reinterpret_cast. For a conversion of void* to int* you can only use static_cast (or the equivalent C-style cast). reinterpret_cast allows anything, that's usually a dangerous thing and normally reinterpret_cast is rarely used, tipically to convert When should a sequential model be used with Tensorflow in Python? Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier. I've Static casting is done by the compiler: it treats the result as the target type, no matter what. Is there a database for german words with their pronunciation? Not sure if it was just me or something she sent to the whole team. Sometimes reinterpret_casts can't be avoided but trying to assert on its property is almost certainly a sign that the code is trying to do something it shouldn't try. const_cast can be used to remove or add const to a variable. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. static_cast is used for cases where you basically want to reverse an implicit conversion, with a few restrictions and additions. C++static_cast, dynamic_cast, const_cast, reinterpret_cast. reinterpret_cast if you've omitted details that mean you might actually be reading memory using a type other than the type is was written with, and be aware that your code will have limited portability. dynamic_cast This cast is used for handling polymorphism. In that case it will read the value of p using p's type, and that value is then converted to a T*. Use static_cast if this extra check is not necessary. reinterpret_cast This is the trickiest to use. Why is it so much harder to run on a treadmill when not holding the handlebars? Is there a database for german words with their pronunciation? It also will apply a const_cast if it absolutely must. 2. level 2. zninja-bg. What are the criteria for a protest to be a strong incentivizing factor for policy change in China? Received a 'behavior reminder' from manager. gives some good details. -static_cast -dynamic_cast -const_cast -reinterpret_cast Now that static_cast is somehow similar to the c style typecast with some minor differences. reinterpret_cast allows anything, that's usually a dangerous thing and normally reinterpret_cast is rarely used, tipically to convert As Arkaitz said, since dynamic_cast performs the extra check, it requires RTTI information and thus has a greater runtime overhead, whereas static_cast is performed at compile-time. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? It makes sure that the result of the t Continue Reading More answers below You should use it in cases like converting float to int, char to int, etc. Ready to optimize your JavaScript with Rust? static_cast is just a compile time cast, checks if origin class can be promoted to the casted class by some simple rules as inheritance. 5.2.10/1 says "Conversions that can be performed explicitly using reinterpret_cast are listed below. 2static_cast constconstvoid*, static_cast 3dynamic_cast* Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Does integrating PDOS give total charge of a system. When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used? Using dynamic_cast for this is safe, using static_cast is unsafe - you must be sure that the object you're casting is actually a Derived. A tag already exists with the provided branch name. static_cast Vs reinterpret_cast. Possible Duplicate: By using this website, you agree with our Cookies Policy. Connect and share knowledge within a single location that is structured and easy to search. This is exclusively to be used in inheritance when you cast from base class to derived class. If every static_cast, dynamic_cast, and reinterpret_cast had the power to cast away constness too, using them would become a lot more dangerous---especially when templates are involved! reinterpret_cast This is the trickiest to use. Did neanderthals need vitamin C from the diet? Should I give a brutally honest feedback on course evaluations? This should be used if you know that you refer to an object of a specific type, and thus a check would be unnecessary. You can use it for more than just casting downwards you can cast sideways or even up another chain. In general, you should always prefer static_cast for casting that should be safe. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Only use reinterpret_cast if what you're doing really is changing the interpretation of some bits in the machine, and only use a C-style cast if you're willing to risk doing a reinterpret_cast. The implications of your statement is that you should use reinterpret_cast<> if you don't know that the type was an int or correctly aligned? Ready to optimize your JavaScript with Rust? How many transistors at minimum do you need to build a general-purpose computer? Are there breakers which can be triggered by an external signal and have to be reset by hand? In your case, you should use the static_cast, since the downcast from the void* is well-defined in some circumstances. void**vpp=reinterpret\u castcpp """" Are defenders behind an arrow slit attackable? When should static_cast, dynamic_cast and reinterpret_cast be used? Lua pattern matching vs regular expression, Explain Python regular expression search vs match. dynamic_cast This cast is used for handling polymorphism. const_cast can be used to remove or add const to a variable. Not the answer you're looking for? Dynamic cast requires RTTI and does some magic compared to static cast. It is used for reinterpreting bit patterns and is extremely low level. Add a new light switch in line with another switch? I don't quite get when to use static cast and when dynamic. One difference is that static_cast will perform conversions of one type to another using the standard conversion operators for the type being converted to, while reinterpret_cast does not. Why would Henry want to close the breach? You should use it in cases like converting float to int, char to int, etc. With that assumption, nothing is being reinterpreted - void is an incomplete type, meaning that it has no values, so at no point are you interpreting either a stored int value "as void" or a stored "void value" as int. It's not some miraculous silver-bullet "type-checking cast" in general. 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