In practice, pointer-to-members may differ in size depending on the class they're associated with. Is there any way of using Text with spritewidget in Flutter? Then, even though the cast itself has no associated instructions, the resulting code is slower. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. https://answers.launchpad.net/gcc-arm-embedded/+question/259010, https://github.com/synthetos/g2/tree/dev-168-gquintic/g2core/board, https://github.com/notifications/unsubscribe-auth/AAXj0WIf9jvmsyyo8bkuwYmZIGYVBzOzks5smZZNgaJpZM4Pkl9c. That's right. Thank you. ", reinterpret_cast is supposed to take the input data and. reinterpret_cast conversion Converts between types by reinterpreting the underlying bit pattern. It doesn't mean that bad things must happen, only that they might. Connect and share knowledge within a single location that is structured and easy to search. Parsing file with find gives strange results with different files, Move constructor called twice when move-constructing a std::function from a lambda that has by-value captures, Name of a play about the morality of prostitution (kind of). When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? Integer type capable of holding a value converted from a void pointer and then be converted back to that type with a value that compares equal to the original pointer. Type casting in C++: reinterpret_cast in C++, C++ Type Cast |dynamic_cast|static_cast|const_cast|reinterpret_cast|C style casts. It rejects the code: error: dereferencing a null pointer in '*0' constexpr const int *q = &p->b; ^ -- You are receiving this mail because: You are on the CC list for the bug. Find centralized, trusted content and collaborate around the technologies you use most. How often will this code be run? Thanks for all your comments, especially NotAYakk and Fruny. @Davidbrcz - undefined behavior means only that the language definition doesn't tell you what the code will do. You can use reinterpret_cast. The good settings always work, build after build. reinterpret_cast only guarantees that if you cast a pointer to a different type, and then reinterpret_cast it back to the original type, you get the original value. It is used to convert one pointer of another pointer of any type, no matter either the class is related to each other or not. ***> wrote: privacy statement. Build a vm ubuntu, clone Motate, encounter compiler errors, get help from you, get mk file problems, get help from you and I'm here now. Different OPTIMIZATION settings work for each setup. Did you try the branch sams70-port ? <, error: reinterpret_cast from integer to pointer. 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. It is not possible to directly use static_cast, const_cast, dynamic_cast and reinterpret_cast on std::shared_ptr to retrieve a pointer sharing ownership with the pointer being passed as argument. reinterpret_cast<type> (expr) The reinterpret_cast operator changes a pointer to any other type of pointer. Use Flutter 'file', what is the correct path to read txt file in the lib directory? I'll track this down in more detail in the morning. Did you add an _write stub? The new git branches solve the compiler problems (Motate and g2core). Before investing a bunch of time, might you have a simple solution? C++ . I learn something new for each step, regardless of the direction. Penrose diagram of hypothetical astrophysical white hole. Regards It seems this is a pretty well documented issue (arm launchpad) but no simple solution is provided: In C we access the registers by casting the address to struct pointers which are evaluated at compile time. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I can't see that the cppreference page says you can use, @Cheersandhth.-Alf On the linked page (5) says you can dereference the result of, Link is fixed. Generally reinterpret_cast is much less restrictive than other C++ style casts in that it will allow you to cast most types to most other types which is both it's strength and weakness. Making statements based on opinion; back them up with references or personal experience. const_cast. However, the optimizer may be restricted in what it can assume in the presence of a reinterpret_cast<> or C pointer cast. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To avoid truncating your pointer, cast it to a type of identical size. Also allows any integral type to be converted into any pointer type and vice versa. The expression reinterpret_cast<T>(v)changes the interpretation of the value of the expression v. It can be used to convert between pointer and integer types, between unrelated pointer types, between pointer-to-member types, and between pointer-to-function types. Ready to optimize your JavaScript with Rust? Again the result is implementation-defined, but a pointer value is guaranteed to be unchanged by a round trip through an integer type. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Does integrating PDOS give total charge of a system? 3) A value of any integral or enumeration type can be converted to a pointer type. The reinterpret_cast operator produces a value of a new type that has the same bit pattern as its argument. (The optimizer moves the ldr around a bit in the code). To learn more, see our tips on writing great answers. Can you share the solution? Casting type which has runtime cost is dynamic_cast. A function pointer can be explicitly converted to a function pointer of a different type. Solution 1. reinterpret_cast is a type of casting operator used in C++. [.] Reinterpret cast will always return a pointer. Blink doesn't need an api. just yet. reinterpret_cast In C++ | Where To Use reinterpret_cast In C++? , I would recommend copying the ArduinoDue* files and directory from, On Tue, Sep 26, 2017 at 7:26 PM vaughanatworld ***@***. If you have patience with me I'll get there eventually. When I started testing, (Atmel Studio 7 on Win 10 and Atmel ICE) none of the pins on the patch board wiggled but chilipeppr works.. so I decided to back up and try to try a blink program and test the hardware. The result is then bit-shifted and XORed with itself to produce a unique index (unique to a high degree of probability). How to cast simple pointer to a multidimensional-array of fixed size? Should be double *z= reinterpret_cast<double*> (x); Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs, reinterpret_cast integer to pointer with upcast. Would you consider platformers, including 3D platformers, "casual games"? reinterpret_cast And print hex, Programmer All, we have been working hard to make a technical sharing website that all programmers love. Why is this usage of "I've to work" so awkward? What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. Thank you. Many thanks Misuse of the reinterpret_cast operator can easily be unsafe. If you see the "cross", you're on the right track, Received a 'behavior reminder' from manager. reinterpret_cast controls conversions between unrelated types, such as integers to pointers or pointers to other (unrelated) pointers. In g2core do you use nano.specs? It is not good idea. It is quite common, that pointer does not fit into int value (for example on 64-bits systems). See also Casting Operators Keywords Feedback Note "compares equal to the original pointer". [Edited by - SymLinked on March 14, 2009 5:32:35 PM], [Edited by - NotAYakk on March 14, 2009 9:07:46 PM]. Where and why do I have to put the "template" and "typename" keywords? It also allows casting from pointer to an integer type and vice versa. @Billy ONeal: You can but not polymorphically aware. In that particular case the code is safe. This is always allowed for public inheritance, without an explicit type cast. You can convert a pointer into an integer type that's large enough to hold the value, and you can convert that value back into a pointer with the same type as the original. Why do we have reinterpret_cast in C++ when two chained static_cast can do its job? Hi guys, What is a smart pointer and when should I use one? 4 comments Comments. An object pointer (including void*) or function pointer can be converted to an integer type using reinterpret_cast. reinterpret_cast from B* to std::uintptr_t, reinterpret_cast from std::uintptr_t to B* (because it's the same type back and forth). a compile-time functionality and that it has no performance cost at all. reinterpret_cast integer to pointer with upcast. I can't understand. Brian. Theoretically, 16 could be replaced by any 4x (32bit) or 8x (64bit) integer. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I don't know what "safe" means, but the behavior of a program that uses this code is undefined. Disconnect vertical tab connector from PCB. Have a question about this project? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If you choose 0, the macro can be simplified as: Thanks for contributing an answer to Stack Overflow! The failure is always on the same ldr instruction. I wonder why can we put a integer 16 as parameter of reinterpret_cast. Syntax reinterpret_cast < new_type > ( expression ) Returns a value of type new_type. In C, for example, if the money array starts at 0x2000 and sizeof. This won't cut it when I get to g2core but is good enough for blink. type; type pointer type; pointer type . How to show AlertDialog over WebviewScaffold in Flutter? Even if you are compiling your program for a 32-bit computer, you should fix your code to remove these warnings, to ensure your code is easily portable to 64-bit. Is this an at-all realistic configuration for a DHC-2 Beaver? C int a=(int) b;. Not the answer you're looking for? It is used for reinterpreting bit patterns and is extremely low level. Why should I use a pointer rather than the object itself? Would it be feasible for you to have a global vector of SceneObjects or of pointers to SceneObject and give Havok an index into this vector? . You actually tell the compile "trust me, I know what I am doing". reinterpret_cast is a type of casting operator used in C++. reinterpret_cast < new-type > ( expression ) Returns a value of type new-type . This will only compile if the destination type is long enough. Depending on how inheritance is implemented, the implicit conversion could require an adjustment to the value of the pointer, and there's no way to do that when the cast goes directly to the base type. Many thanks As with all cast expressions, the result is: an lvalue if new_type is an lvalue reference type or an rvalue reference to function type; ; an xvalue if new_type is an rvalue reference to object type; ; a prvalue otherwise. Should I give a brutally honest feedback on course evaluations? You're right, but think about it: reinterpret_cast means maybe a bad design or that you're doing something very low level. Please give me explanation and code so i can do better. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? It's a good assumption to start with. My point is that dynamic_cast is the only cast type which has additional runtime cost, relatively to C casting. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? Another way of expressing the reinterpret_cast(16)->y could be had like so: point * myPt = 16u; we know 16 is not a valid address, but the compiler doesn't, and so long as we don't try to read the address we're pointing to, we're okay. It forces something that is not allowed by the rules. const_caststatic_castreinterpret_castdynamic_castCinta=(int)b;C++con. That beats very common optimizations such as storing variables in registers. Why can't I reinterpret_cast uint to int? which says to cast the integer pointer of money to a char pointer and assign to bags. Ready to optimize your JavaScript with Rust? reinterpret_cast intreinterpret_cast cast cast () The simple answer is that you should NEVER cast an int to a class object pointer. Regular cast vs. static_cast vs. dynamic_cast in C++ 3. I've also heard that one should avoid it. Sign in where t is a type, f is a field name. rev2022.12.9.43105. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Note that this is Undefined Behavior. Can Reinterpret_cast return null? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? BOARD=Due". Explanation Unlike static_cast, but like const_cast, the reinterpret_cast expression does not compile to any CPU instructions (except when converting between integers and pointers or on obscure architectures where . Making statements based on opinion; back them up with references or personal experience. When would I give a checkpoint to my D&D party that they can return to if they die? How do you explain the differences among static_cast, reinterpret_cast, const_cast, and dynamic_cast to a new C++ programmer? My understanding is that C++ reinterpret_cast and C pointer cast is a just How to initialize a pointer to a specific memory address in C++. In the Motate blink demo, there seems to be missing make files boards.mk It also permits any integral type to be converted into any pointer type and vice versa. Please contact us if you have any trouble resetting your password. C int a=(int) b;. static\u castv[0] int reinterpret\u cast reinterpret_cast Syntax : In the link you've posted there is the answer: It's only that or using a simple (long int) cast that works, so there's no alternative. Well occasionally send you account related emails. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. What do I do if I have an idea for a game (Characters, weapons, stories, etc.) Integer 16 is just a memory address. reinterpret_cast<int> (reinterpret_cast<int*> (const _cast<char*> ( (ptr)))) ; But the compiler gives a warning, warning C4311: "reinterpret_cast": from int* to int pointer cut off. Already on GitHub? Jumping into C++, the Cprogramming.com ebook; How to learn C++ or C; C Tutorial; C++ Tutorial; 5 ways you can learn to program faster; The 5 most common problems new programmers face; The new git branches solve the compiler problems (Motate and g2core). 4230. How to prevent keyboard from dismissing on pressing submit key in flutter? The reinterpret_cast allows the pointer to be treated as an integral type. How is the merkle root verified if the mempools may be different? Why does the USA not have a constitutional court? . Since the class holds this integer value and not a pointer value, it can be used as a constant expression. It looks like the git cloned Motate used gcc-arm-none-eabi-5_4-2016q2 when last committed to github. You signed in with another tab or window. Instead, erase the type of the callable object. Given your on going work on g2core, you must have solved the problem. The purpose of reinterpret_cast is to reinterpret the bits of one value as the bits of another value. 63715 - Compiler giving "reinterpret_cast from integer to pointer" in constexpr function Last modified: 2014-11-02 20:54:13 UTC Bug 63715 - Compiler giving "reinterpret_cast from integer to pointer" in constexpr function Note You need to log in before you can comment on or make changes to this bug. It does not check if the pointer type and data pointed by the pointer is same or not. I know I could do the hardware test quickly with the Arduino IDE but then I would have missed learning an arm C/C++ development environment. https://answers.launchpad.net/gcc-arm-embedded/+question/259010. Reply to this email directly, view it on GitHub What is the difference between const int*, const int . I am looking for a way to achieve this. The new git branches solve the compiler problems (Motate and g2core). It could use some more polishing. You can either use intptr_t instead and cast when you need to use the value or if that is not workable then both gcc and clang support a little documented work-around that should allow your particular use case. As a result, it probably has to assume that a write through that pointer can change any variable. I've built my own patch board to hook up a Due to the original Stepper controllers. Find centralized, trusted content and collaborate around the technologies you use most. dynamic-cast instead it will cost you something, because it has to look in a lookup table at runtime. Have you seen similar behavior during your exploits? The first method reads a 32 bit value using the computer's natural byte ordering, and then swaps the bytes if bswap is true. Copy link toncho11 commented Sep 11, 2019. The C++ standard guarantees the following: static_casting a pointer to and from void* preserves the address. The address of a pointer is just a number, so we can abuse this fact in order to get information about our structures/classes. I've tried to find the answer to this on my own via Google but no luck so far. Sorry it's been a while since I last compiled this project and I don't have ARM GCC installed now, so hard to advise anything. Brian, @vaughanatworld How'd you go with this? reninterpret_cast does not check if the pointer type and data pointed by the pointer is same or not. That took me to Motate and blink, then compile problems, mk file problems, interrupt not defined problems. How can I pass variables meant for a trigger function in SQLite? Does balls to the wall mean full speed ahead or full speed ahead and nosedive? It does require using some form of global data, but it's probably much cleaner and more portable than casting between pointers and integers. Unless the desired conversion is inherently low-level, you should use one of . You can use any other pointer, or you can use (size_t), which is 64 bits. When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? Casting between pointers on every platform I've ever heard of has zero cost, and no performance change whatsoever. The type-cast operator uses a particular syntax: it uses the operatorkeyword followed by the destination type and an empty set of parentheses. That is, in the following, a, b and c all point to the same address: int* a = new int(); void* b = static_cast<void*>(a); int* c = static_cast<int*>(b); There's a similar clause about pointers-to-function (they all have to be the same size, but not necessarily the same as pointers-to-object), and pointers-to-member (again, all the same size, but not necessarily compatible with either pointers-to-object or pointers-to-function). Notice that the return type is the destination type and thus is not specified before the operatorkeyword. Description Martin Benda 2014-11-02 20:24:05 UTC Another way of expressing the reinterpret_cast<point*> (16)->y could be had like so: point * myPt = 16u; we know 16 is not a valid address, but the compiler doesn't, and so long as we don't try to read the address we're pointing to, we're okay. So in the following: int* a = new int(); void* b = reinterpret_cast<void*>(a); int* c = reinterpret_cast<int*>(b); a and c contain the same value, but the value of b is unspecified. I have 2 different Atmel Studio solutions for the blink demo. const_cast No, the cast does not just force something that would be implicit. The passage of B type's address with a uintptr_t is useless also but allowed because "the same type". By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The same class of error is popping up on Motate. How many transistors at minimum do you need to build a general-purpose computer? Though really, it's a terrible idea to surpress this warning, every single instance is a bug waiting to happen. C++11 introduced a standardized memory model. 03.Typecasting in C++ | Static_cast | Dynamic_Cast | Reinterpret_Cast + Const_Cast in c++ ( 2022). However, I'm now encountering a link error with an undefined reference to '_write'. Usage of the reinterpret_cast operator can have undefined or implementation . Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. The Definitive C++ Book Guide and List. Before investing a bunch of time, might you have a simple solution? std::intptr_t is an alias for some integer type that is large enough to hold a pointer value. Keyword explicit On a function call, C++ allows one implicit conversion to happen for each argument. It may just not be a valid pointer in the sense that it actually points to an object of type B. Many thanks Is this an at-all realistic configuration for a DHC-2 Beaver? =). C++ does have, But note that this code is deep into undefined behavior. It looks like something to do the the g2core json api. The bad settings never work. []. std:: static_pointer_cast, std:: dynamic_pointer_cast, std:: const_pointer_cast, std:: reinterpret_pointer_cast From cppreference.com < cpp | memory | shared ptr C++ Compiler support Freestanding and hosted Language Standard library Standard library headers Named requirements Feature test macros (C++20) Language support library Or they might not. Similarly, reinterpret_cast can be used to convert an integer type into a pointer type. The reason that. For now set the linker flag: LDFLAGS += -specs=nosys.specs . Yes, this is true. static_cast only allows conversions like int to float or base class pointer to derived class pointer. cppreference updated with the appropriate pointer-interconvertible rule to add to derived-as-base lvalue access rule.. . How to test that there is no overflows with integration tests? Line 2 declares ip as a pointer to integer and initializes it to (int*)p. 2ip(int*)p (int*)p is a C-style cast, which is in this case resolved to reinterpret_cast<int*>(const_cast<char*>(p)). Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How could my characters be tricked into thinking they are on Mars? reinterpret_cast This is the trickiest to use. reinterpret_cast allows anything, that's usually a dangerous thing and normally reinterpret_cast is rarely used, tipically to convert pointers to/from integers or to allow some kind of low level memory manipulation. Flutter. Counterexamples to differentiation under integral sign, revisited. By fiddling with the OPTIMIZATION setting, I can always find at least one setting which will give proper execution. As far as I understand, reinterpret_cast isn't done at compile time? according to Myers: reinterpret_cast is for low-level casts that produce implementation-dependent (that is, non-portable) results, such as casting a pointer to an int . You can think reinterpret_cast as a C-style cast. Wrong - you need to reinterpret p, pointer value p contains, not the address of pointer variable itself. No cost other than any gain/loss in performance for performing instructions at the new width, which I might add, is only a concern in rare cases. The code in the question doesn't do that: it converts the value into a pointer with a different type from the original. C++. Solution 2. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. The conversions to the two pointer types still have to be done in the runtime code, so they are in functions that are not constepr. C style casts in C++ will attempt a static_cast first and only perform a reinterpret_cast if a static cast cannot be performed. Except that converting a prvalue of type "pointer to T1" to the type "pointer to T2" (where T1 and T2 are function types) and back to its original type yields the original pointer value, the result of such a pointer conversion is unspecified. 16 is the address we're assigning to the pointer, which lets us calculate the offset of the specified member. Typesetting Malayalam in xelatex & lualatex gives error. My messing about making up with my own mk files is not helping. Is there a verb meaning depthify (getting more depth)? The index is then truncated by a standard C-style cast to the return type of the function. as the results aren't defined on different compilers. From [expr.reinterpret.cast].6 (emphasis mine):. And how is it going to affect C++ programming? Each Resource has a 32 bit integer value. Thanks for contributing an answer to Stack Overflow! In short you're just force something could be consider as implicit. TL;DR. clang is correct, this is known gcc bug. bin2c >C++exebin.hC++bin2cexe Instead, the functions std::static_pointer_cast, std::const_pointer_cast, std::dynamic_pointer_cast and std::reinterpret_pointer_cast should be used: 2. In the Motate blink demo, there seems to be missing make files boards.mk and board/ArduinoDue.mk files or something equivalent. This is exclusively to be used in inheritence when you cast from base class to derived class. You cannot cast away a const or volatile qualification. Selecting image from Gallery or Camera in Flutter, Firestore: How can I force data synchronization when coming back online, Show Local Images and Server Images ( with Caching) in Flutter. Thank you. On my GCC 4.4.2, C++ doesn't warn about int-pointer casting stuff. There is no requirement that the address of an object of a derived type be the same as the address of any of its bases. In g2 the relevant branch would be dev-168-gquintic. You are receiving this because you commented. unsigned char* x = reinterpret_cast<unsigned char*> (p); > double *z= reinterpret_cast<double*> (&x); Again - here you takes an address of you local variable x, not the value it contains. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. ../../motate/cmsis/TARGET_Atmel/sam3x/include/sam3x8e.h:500:21: error: reinterpret_cast from integer to pointer That's because the safety of upcasting. Share Improve this answer Follow Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? Next, we can simplify all of &reinterpret_cast(16)->y to: &myPt->y. C style casts in C++ will attempt a static_cast first and only perform a reinterpret_cast if a static cast cannot be performed. Asking for help, clarification, or responding to other answers. Not sure if it was just me or something she sent to the whole team. Name of a play about the morality of prostitution (kind of). Flutter AnimationController / Tween Reuse In Multiple AnimatedBuilder. const auto val = * reinterpret_cast<const int32_t *> (&buf [offset]); The first and second methods actually can do slightly different things. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? For instance, if you cast an int to a pointer, the optimizer likely will have no idea what that pointer could be pointing to. // main.c DMA_Channel *tx_channel = (DMA_Channel *)0x40020044; tx_channel->reload(15); By clicking Sign up for GitHub, you agree to our terms of service and What does it mean? Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Should teachers encourage good students to help weaker ones? Program to convert integer pointer into character pointer. The code in the question doesn't do that: it converts the value into a pointer with a different type from the original. So, reinterpret_cast<> is partly designed to do exactly that. ReInterpret Cast ( reinterpret_cast) is a cast operator that converts a pointer of some data type into a pointer of another data type, even if the the data types before and after conversion are different. Thank you! Not the answer you're looking for? In the Motate blink demo, there seems to be missing make files boards.mk and board/ArduinoDue.mk files or something equivalent. I am trying "make BOARD=Due". How to use a VPN to access a Russian website that is banned in the EU? C++ Weekly - Ep 185 - Stop Using reinterpret_cast! A dynamic_cast performs casts on polymorphic types and can cast a A* pointer into a B* pointer only if the object being pointed to actually is a B object. to your account, I'm having problems compiling Motate on Ubuntu 64 and gcc-arm-none-eabi-6-2017-q2 with the following error: This compiler also violates the new C language standard. In SamUniqueID.cpp -> UUID_t::UUID_t() -> line 90: uint8_t byte = (_d[i/4] >> (i%4)) & 0xF; -> memory access error exception. I'm using the Havok Physics engine and it stores user data via a long int. I doubt the performance impact would be significant. You can convert a pointer into an integer type that's large enough to hold the value, and you can convert that value back into a pointer with the same type as the original. Casting from DynamicType to AliasedType if AliasedType is a (possibly cv-qualified) base class of DynamicType, @Davidbrcz: Since it's easy to produce a counter-example that has UB and will crash with common compilers, you can be absolutely sure that. The upcasting is allowed by rule 5 (6 seems to work too though) with T1=B* and T2=A* and the type aliasing rules below. What happens when Reinterpret_cast fails? What happens if you score more than 99 points in volleyball? Classic two steps forward and one step back. Why do you think this is necessary? Is there a verb meaning depthify (getting more depth)? Then we have reinterpret_cast(20u) - static_cast(16) simply means "interpret the object at address 16 as type t", but you know that there's no such t object at the address. const_cast static_cast reinterpret_cast dynamic_cast . Reinterpret_cast in c++ allows any pointer to be converted into any other pointer type. C++. Brian To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The size of an object may be as big as your RAM and the biggest possible pointer value is the size of your RAM - 1 therefore size_t is allways large enough. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. An int is not guaranteed to be able to losslessly store a pointer though, so you should use the std::intptr_t type instead. rev2022.12.9.43105. To cast an integer to a pointer, you might write reinterpret_cast<int *>(100); Popular pages. To learn more, see our tips on writing great answers. I want to be able to quit Finder but can't edit Finder's Info.plist after disabling SIP. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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