By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Ready to optimize your JavaScript with Rust? How can I determine why a call to IXMLDOMDocument::load() fails? rev2022.12.9.43105. can be done with reinterpret_cast, except when such conversions would So, my question is: is it possible to write a constexpr function like. So did you start writing it? Downcasting shared_ptr
to shared_ptr
? There is limited introspection available at compilation time, and you can for example (using function overload resolution) detects if a class B is an accessible base class of another class D. The Standard does not require full introspection, and notably: And of course, there is the issue that the object layout is more or less unspecified, anyway (though C++11 adds the ability to distinguish between trivial layout and class with virtual methods if I remember correctly, which helps a bit here!). Explanation Unlike static_cast, but like const_cast, the reinterpret_cast expression does not compile to any CPU instructions. Regular cast vs. static_cast vs. dynamic_cast in C++ 3. If you see the "cross", you're on the right track. For example, you can have pointer to int, that due to compile time limitations really pointed to runtime memory allocated as double. I am looking for a way to achieve this. What's the difference between constexpr and const? Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Since C++17 the template is also marked constexpr.. On the other hand, you could also enrich this using a shared_ptr/weak_ptr approach in order to be able to copy and move the wrapper and still guarantee the availability (but beware of memory leaks). Asking for help, clarification, or responding to other answers. Hence Wrapper is not equivalent to Wrapper. It means that it can be executed at compile-time for some argument values (function or template arguments). Asking for help, clarification, or responding to other answers. Is it possible to create custom rules for clang-format? Of course, if we were given a broader picture of your usage of this class, we might be able to pool our brains together and help you figure a better solution. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). Is this use of reinterpret_cast on differently-qualified struct members safe? Pick one. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, How to determine CPU and memory consumption from inside a process, Should I use static_cast or reinterpret_cast when casting a void* to whatever. It's recently that I needed to properly understand reinterpret_cast, which is a method of converting between data types. A tag already exists with the provided branch name. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Disconnect vertical tab connector from PCB. 2. When to use reinterpret_cast? const_cast is compile time as well, no code needs to be generated. Unlike static_cast, but like const_cast, the reinterpret_castexpression does not compile to any CPU instructions. You don't need to do it, and it probably won't change anything because of what I said above. In C and C++, constructs such as pointer type conversion and union C++ adds reference type conversion and reinterpret_cast to this . type; type pointer type; pointer type . Asking for help, clarification, or responding to other answers. 1) When the C-style cast expression is encountered, the compiler attempts to interpret it as the following cast expressions, in this order: a) const_cast <new-type> (expression); b) static_cast <new-type> (expression), with extensions: pointer or reference to a derived class is additionally allowed to be cast to pointer or . Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 1980s short story - disease of self absorption. reinterpret_cast between char* and std::uint8_t* - safe? Of course, if we were given a broader picture of your usage of this class, we might be able to pool our brains together and help you figure a better solution. Ready to optimize your JavaScript with Rust? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. I know what what all this for, and I have my reasons to do this., you will have to adapt your ways. did anything serious ever run on the speccy? View Details. Ready to optimize your JavaScript with Rust? Connect and share knowledge within a single location that is structured and easy to search. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Copy data from cv::Mat to CvMat and viceversa. Casts are an indication that a programmer has made a mistake and has not bothered to fix that mistake, so they use cast as a cheap-and-nasty, quick-and-dirty workaround. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). reinterpret_cast will permit a cast between any two pointers. The reinterpret_cast operator, as well as the other named cast operators, is more easily spotted than C-style casts, and highlights the paradox of a strongly typed language that allows explicit casts. How could my characters be tricked into thinking they are on Mars? static_cast is also (intentionally) less powerful than C-style casts, so you can't inadvertently remove const or do other things you may not have intended to do. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. did anything serious ever run on the speccy? Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. What about const_cast is that compile time ? How can I convert a std::vector to a float array? A sort of a STATIC_ASSERT. Microsoft Windows SChannel SSPI Self test? The main advantage of static_cast is that it provides compile-time type checking, making it harder to make an inadvertent error. For example, the integer 10 would be converted to the double 10.0. reinterpret_cast<> just looks at the bits in memory in as if they were the encoding as a different type. Share . [Issue 14207] [REG2.065] [CTFE] ICE on unsupported reinterpret cast in compile time. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Acorn 23513 reinterpret_cast This is the trickiest to use. adding or subtracting some number of bytes corresponding to the offset of one of the classes in the other) or ends up being effectively a reinterpret_cast of the same address. via Digitalmars-d-bugs Sat, 04 Apr 2015 13:50:21 -0700 Because we will only manipulate everything through WrapperImpl, we ensure the type-safety (and the meaningful-ness of our static_cast) by checking conversions through std::enable_if and std::is_base_of in the template constructors: It might be tweaked according to your needs, for example you could remove the ability to Copy and Move the WrapperRef class to avoid situation where it point to a no longer valid Wrapper. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Connect and share knowledge within a single location that is structured and easy to search. Determine if reinterpret_cast is safe at compile time. Since you're saying you don't know how to test if your functions are callable at compile-time, it looks to me like you're only adding constexpr to make your code faster. First, Intel Fortran has an extension called the NO_ARG_CHECK attribute. Z:\test\HostProject\Plugins\HoudiniNiagara\Source\HoudiniNiagara\Private\NiagaraDataInterfaceHoudini.cpp(119): warning C4996: 'FNiagaraTypeRegistry::Register': This overload is deprecated, please use the Register function . The standard says that what it does is implementation defined. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Not sure if it was just me or something she sent to the whole team. Why is the eastern United States green if the wind moves from west to east? This is what gives us a common denominator (WrapperImpl). In some situations I have a variable of type Wrapper, and I'd like to call a function that receives a (const) reference ro Wrapper. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. reinterpret_casts are applicable in two scenarios: Received a 'behavior reminder' from manager. Using reinterpret_cast() the code does not compile with the compiler declaring that reinterpret_cast cannot result in a constant expression. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I thought about a compile-time check, some sort of an expression that may be calculated at compile time and subjected to a, There's a function that takes some parameters and is responsible to initiate an asynchronous operation. For reinterpret_cast, the machine code can be resolved in compile-time as well. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs, MOSFET is getting very hot at high frequency PWM. static_cast<> uses sensible, well-defined conversions. How to verify the validity of reinterpret_cast at compile time. Not the answer you're looking for? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I'll post a proper answer in a moment. Explanation. In C++ reinterpret_cast can only perform a specific set of conversions, explicitly listed in the language specification. It is important to remember that even though a program compiles, its . Is this an at-all realistic configuration for a DHC-2 Beaver? A dynamic_cast can either return a null ptr (when using with a pointer) or otherwise throw a bad cast exception. The C++ compiler detects and quietly fixes most but not all violations. Does auto deduce the type at compile time or runtime in C++ 11? constexpr unique id, compiles with clang but not with gcc. I am little confused with the applicability of reinterpret_cast vs static_cast. It is used for reinterpreting bit patterns and is extremely low level. That is, casting a derived class pointer to a base class pointer. Not the answer you're looking for? Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Do constant and reinterpret cast happen at compile time? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @RedX: in this specific place this is equivalent to, Thanks a lot for answering. Hence I've added the following to Wrapper: The problem is that in some cases the brute-force cast is not valid. Find centralized, trusted content and collaborate around the technologies you use most. Using Reinterpret_Cast in a Constexpr Function, en.cppreference.com/w/cpp/utility/variant, can execute a function at compile-time even if it's not. How to set a newcommand to be incompressible by justification? The " reinterpret_cast " operator can convert any type of variable to fundamentally different type. Issue. Why is the federal judiciary of the United States divided into circuits? Using its knowledge of the actual types it can determine whether the pointer/reference needs to be adjusted (e.g. How do you explain the differences among static_cast, reinterpret_cast, const_cast, and dynamic_cast to a new C++ programmer? Are there conservative socialists in the US? How to check the size of a structure at compile time? What it does copy is the pointer to the value. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Please update your code to the new API before upgrading to the next release, otherwise your project will no longer compile. Counterexamples to differentiation under integral sign, revisited. Typically, reinterpret_cast only changes the pointer/reference type, but leaves the pointer value alone. That is, in the following, a, b and c all point to the same address: What is an "acceptable" return value from cv::calibrateCamera? If the code context in which the dynamic_cast is performed only knows about the cast-from object via a pointer or reference from some other code, and is unable to determine the real runtime type of the variable, it's obliged to use Run-Time Type Information (RTTI) to see whether/how the runtime type relates to the cast-to type. If you put the reinterpret_cast in a place that will always get executed, then when the code is actually executed in the compiler then it will throw errors even with VC. Coding example for the question How to verify the validity of reinterpret_cast at compile time-C++. c++ casting reinterpret-cast. Cppreference nicely lists all cases, so at least some points are easy, like for point 1 pseudocode: We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. C++11. This is the cast the C++ compiler uses internally for implicit casts also. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Placing exclusive lock on read-only files in Linux, Compile error with variadic templates and overloaded << operator. Therefore, if your static_cast is between unrelated types then it will fail at compile type but the same cast will succeed using a reinterpret_cast. On the other hand, it is clear that, for embedded users and specialized compilers/flags/environments, it could be useful to some degree. If no specialization of the template would satisfy the requirements for a constexpr function when considered as a non-template function, the template is ill-formed, no diagnostic required. How can I replace the void pointer with something that has compile time type checks in this callback? There are very few good uses of reinterpret_cast, specially if you program and compile your code assuming the strict aliasing rule holds: it would be easy to create pointers that break it. My question is what about reinterpret_cast and const_cast do they happen at compile time or run-time ? Does integrating PDOS give total charge of a system? Which casting technique is better for doing casting from upper class to lower class in C++. If you see the "cross", you're on the right track, Connecting three parallel LED strips to the same power supply. I would think that interpret cast happens at run-time since it behaves like dynamic_cast indicating if the cast was successful. The reason (again to my understanding) is that the compiler cannot interpret the validity of the conversion. NDR ("no diagnostic required") means that compilers are not required to notice this error, and different compilers can be more or less strict about it. When should you use constexpr capability in C++11? Compilers check the validity of a reinterpret_cast expression at compile time: aliasing rule violation happens when an object is accessed:. In C++11 the template std::addressof, in the <memory> header, was added to solve this problem. To learn more, see our tips on writing great answers. It does not check if the pointer type and data pointed by the pointer is same or not. Thanks for contributing an answer to Stack Overflow! There are very few good uses of reinterpret_cast, specially if you program and compile your code assuming the strict aliasing rule holds: it would be easy to create pointers that break it. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Not sure if it was just me or something she sent to the whole team, Examples of frauds discovered because someone tried to mimic a random sequence, TypeError: unsupported operand type(s) for *: 'IntVar' and 'float'. Counterexamples to differentiation under integral sign, revisited, Irreducible representations of a product of two groups. It is purely a compiler directive which instructs the compiler to treat the sequence of bits (object representation) of expression as if it had the type new_type . Can a prospective pilot be negated their certification because of too big/small hands? Yes, reinterpret_cast subverts the type system. when did cast in c++ occur, compile time or run time? Most would say it is a program smell and blame the programmer. Why would Henry want to close the breach? What happens if you score more than 99 points in volleyball? If it wasn't, the runtime reinterpret_cast would also be undefined. Don't blame programmers for these mistakes! Is there a verb meaning depthify (getting more depth)? The reinterpret_cast operator produces a value of a new type that has the same bit pattern as its argument. How can I use the compile time constant __LINE__ in a string? A value of integral or enumeration type to a pointer. static_cast - what does conversion between compatible types mean? When this is specified on a routine or a dummy argument, it disables compile-time checks for type, rank and kind. used to add or remove const-ness - is entirely compile time - it doesn't affect the actual code generated for run-time execution - only whether the compiler stops with an error when it sees the code attempting to write to a const value. Connect and share knowledge within a single location that is structured and easy to search. @manasij7479 That is completely incorrect. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is it possible to creat a derived object from a base object through downcast? rev2022.12.9.43105. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. I need a way to verify during compile time that upcast/downcast of a pointer to another class (either derived or base) does not change the pointer value. The dynamic_cast needs to resolve virtual tables and adjust the correct addresses of virtual methods based on the type FROM and TO. I need a way to verify during compile time that upcast/downcast of a pointer to another class (either derived or base) does not change the pointer value. It is efficient because it does not copy the value. When would I give a checkpoint to my D&D party that they can return to if they die? From what I have read the general rules are to use static cast when the types can be interpreted at compile time hence the word static. That is, the cast is equivalent to reinterpret_cast. Is it possible to hide or delete the new Toolbar in 13.1? Is it alright to return a reference to a non-pointer member variable as a pointer? How can I obtain day name from QDatetime in a different language? I have read that static_cast happens at compile time and dynamic_cast happens at run time thus are slower than static_cast. How to automatically create a file with the latest compile time and include it into a library? Counterexamples to differentiation under integral sign, revisited. Please don't reply with "why do you want to do this" or "this is against the standard". What are the differences between struct and class in C++? Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Why doesn't this reinterpret_cast compile? One of the things I am curious about is that given the nature of, @Ryoku Yes, it might be computed at compile-time if the optimizer is smart enough, but again, adding. Sorry for being a bit harsh, but for the love of silicon, write C or write good, modern C++. A static_cast may change the value of the pointer in the case of multiple inheritance (or when casting an interface to a concrete type), this offset calculation may involve an extra machine instruction. Create QAction with shortcut, without inserting in menu. Dont do whatever this is. What is the difference between 'typedef' and 'using' in C++11? Obviously there is no automatic cast here, Wrapper is not derived from Wrapper. dynamic_cast: the compiler considers its knowledge of the actual types involved. C style casts in C++ will attempt a static_cast first and only perform a reinterpret_cast if a static cast cannot be performed. All other casts are calculated in compile-time. OVERSIGHT OF THE VOTING RIGHTS ACT: POTENTIAL LEGISLATIVE REFORMS This is fine, but I'd like to catch this during compile time and fail the build. Note that a C-style (T)expression cast means to perform the first of the following that is possible: a const_cast , a static_cast , a static_cast followed by a const_cast , a reinterpret_cast , or a reinterpret_cast followed by a const_cast . Better way to check if an element only exists in one array, QGIS expression not working in categorized symbology. On the other hand, you could also enrich this using a shared_ptr/weak_ptr approach in order to be able to copy and move the wrapper and still guarantee the availability (but beware of memory leaks). Are you stuck? This is what gives us a common denominator (WrapperImpl). A tag already exists with the provided branch name. I know what what all this for, and I have my reasons to do this., you will have to adapt your ways. If this succeeds - it should take the ownership of the appropriate allocated resources. 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. This is exclusively to be used in inheritence when you cast from base class to derived class. unique_ptr to a derived class as an argument to a function that takes a unique_ptr to a base class. I am little confused with the applicability of `reinterpret_cast` vs `static_cast`. If it is helpful I am compiling under C++17 and using Visual Studio. Does integrating PDOS give total charge of a system? How to reduce compile time with C++ templates, Getting around the reinterpret cast limitation with constexpr. How to extract the source filename without path and suffix at compile time? Should I be worried or at all hesitant about using any of the tricks above to get the program to compile? When should static_cast, dynamic_cast, const_cast, and reinterpret_cast be used? Error trying to use 'strtok' for a string, How do you get the type of a member function, Check for function signature also for inherited functions. @ 2015-11-23 7:46 Maxim Ostapenko 2015-11-23 7:48 ` " Maxim Ostapenko 2015-11-23 8:06 ` " Maxim Ostapenko 0 siblings, 2 replies; 26+ messages in thread From: Maxim Ostapenko @ 2015-11-23 7:46 UTC (permalink / raw) To: Jakub Jelinek, Kostya Serebryany, GCC Patches Cc: Yury Gribov, Vyacheslav Barinov, Slava Garbuzov Hi! Does a 120cc engine burn 120cc of fuel a minute? I've added the verification (as you may see), but it works in run-time. This is the cast the C++ compiler uses internally for implicit casts also. 7 If the instantiated template specialization of a constexpr function template or member function of a class template would fail to satisfy the requirements for a constexpr function, that specialization is still a constexpr function, even though a call to such a function cannot appear in a constant expression. The dynamic cast is the only that needs to be "calculated" in run-time. Is there a verb meaning depthify (getting more depth)? Thanks for contributing an answer to Stack Overflow! How to smoothen the round border of a created buffer to make it look more natural? perform a compile-time casting of one type to another. Note: it is intentional that WrapperRef does not provide an Attach method, such a method cannot be used with a base class. Thanks. 1980s short story - disease of self absorption. Description Martin Benda 2014-11-02 20:24:05 UTC function template parameter loses const when template argument is explicity passed? Connect and share knowledge within a single location that is structured and easy to search. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? On the other hand, it is clear that, for embedded users and specialized compilers/flags/environments, it could be useful to some degree. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 1980s short story - disease of self absorption, MOSFET is getting very hot at high frequency PWM. It is purely a compiler directive which instructs the compiler to treat the sequence of bits (object representation) of expressionas if it had the type new_type. As for the tricks you used, they don't do anything useful. It could be useful to select between two casting functions at compile time. However, I'm certain that there is something else that is happening. To learn more, see our tips on writing great answers. A tag already exists with the provided branch name. To learn more, see our tips on writing great answers. In short, reinterpret_cast can only perform pointer-to-pointer conversions and reference-to-reference conversions (plus pointer-to-integer and integer-to-pointer conversions). Note: this is easy because of the common UnkDisposable base class! However I can get the code to compile by wrapping the function within a template or by using a trivial ternary expression. Not only this demands an awkward syntax, but it also produces an extra code, because Wrapper has a non-trivial d'tor (as you may guessed), and I'm using exception handling. How do I cast a parent class as the child class, Getting the number of elements in std::array at compile time. Making statements based on opinion; back them up with references or personal experience. There is limited introspection available at compilation time, and you can for example (using function overload resolution) detects if a class B is an accessible base class of another class D. *PATCH 0/2] Libsanitizer merge from upstream r253555. Therefore, despite your bold claim P.S. I think "reinterpret_cast" can be safe used to setup correct data type from incorrect only, instead of reverse work. To be concrete, the scenario is the following: I have a Base class and a Derived class (obviously derived from Base ). Should teachers encourage good students to help weaker ones? For reinterpret_cast, the machine code can be resolved in compile-time as well. Writing/reading large vectors of data to binary file in c++. How to check at compile time that a lookup table has the correct size? How can I fix it? reinterpret_cast < new-type > ( expression ) Returns a value of type new-type . static_cast only allows. But when the function is actually called, it becomes clear that its result is not actually constexpr, and its constexprness is silently ignored (see example above). Firstly, a compiler can execute a function at compile-time even if it's not constexpr, as long as it doesn't affect the visible behavior of the program. How is the merkle root verified if the mempools may be different? Normal syntax to do reinterpret_cast is as follows: reinterpret_cast <target-type> (expr) How to get at compile time the offset of a thread_local variable. Making statements based on opinion; back them up with references or personal experience. To learn more, see our tips on writing great answers. To hide multiple closely related algebraic abstractions (numbers) behind a single generic abstraction and provide a generic interface to it. constexpr and initialization of a static const void pointer with reinterpret cast, which compiler is right? Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Using Clang, and its AST inspection capabilities, I think you could write a dedicated checker, but this seems quite complicated, and is of course totally non-portable. Note: it is intentional that WrapperRef does not provide an Attach method, such a method cannot be used with a base class. This rule bans (T)expression only when used to perform an unsafe cast. // main.c DMA_Channel *tx_channel = (DMA_Channel *)0x40020044; tx_channel->reload (15); This cast operator can also convert variable into totally incompatible type too. Following recent . There are ways to handle this situation within the scope of the standard C++. Using reinterpret_cast to check inheritance at compile time. In computer science, a type punning is any programming technique that subverts or circumvents the type system of a programming language in order to achieve an effect that would be difficult or impossible to achieve within the bounds of the formal language.. You only have the data at runtime, in general. Is energy "equal" to the curvature of spacetime? Syntax : Is initializing non static members allowed outside of a class constructor? Received a 'behavior reminder' from manager. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Is the "this" pointer just a compile time thing? C++: Can virtual inheritance be detected at compile time? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. static_cast will only work when you cast between related types. Ready to optimize your JavaScript with Rust? that checks whether the conversion if allowed or not, based on those 11 points? From what I have read the general rules are to use static cast when the types can be interpreted at compile time hence the word `static`. @valdo: is there any reason you can't use more conventional destructor-based RAII (smart pointers in particular), rather than trying to emulate C#? Since compilers like GCC and Clang are able to check if the code breaks the strict aliasing rule, compiling with -fstrict-aliasing -Wstrict-aliasing, I think is should be possible somehow. There's an interface. The example code below contains a macro labelled compBranchSwitch which allows you to quickly switch between compilation scenarios for convenience. When it's uncertain, it lets it slide. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Browse Library. At what point in the prequels is it revealed that Palpatine is Darth Sidious? That is, the cast is equivalent to reinterpret_cast. Effectively, reinterpret_cast<> leaves no run-time footprint. reinterpret_casts are applicable in two scenarios: convert integer types to pointer types and vice versa How should I detect bottleneck of compile time in a large C++ project? Are there conservative socialists in the US? Within the code I have a constexpr which returns a reference to the subclasses member variable representation within the array, in this case a uint32_t variable. 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