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cast to void *' from smaller integer type 'int

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cast to void *' from smaller integer type 'int Is pthread_join a must when using pthread in linux? */void **MatrixIB (unsigned long x, unsigned long y, int size){ void *ptr; void **returnPtr; register unsigned long i, j; This method will not work on 64 bit Big Endian platform, so it unnecessarily breaks portability. The preprocessor will replace your code by this: This is unlikely what you are trying to do. If you convert (void*) to (long) no precision is lost, then by assigning the (long) to an (int), it properly truncates the number to fit. (int*)Pc = pa; After the execution of the above code all the three pointers, i.e., Pa, Pd, and Pc, point to the value 150. How can this new ban on drag possibly be considered constitutional? Losing bytes like thisis called 'truncation', and that's what the first warning is telling you. Connect and share knowledge within a single location that is structured and easy to search. This answer is incorrect for the reasons that have already been mentioned in the comment of, Error "Cast from pointer to smaller type 'int' loses information" in EAGLView.mm when update Xcode to 5.1 (5B130a), http://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models, http://stackoverflow.com/questions/18913906/xcode-5-and-ios-7-architecture-and-valid-architectures, How Intuit democratizes AI development across teams through reusability. Thanks for contributing an answer to Stack Overflow! Cast Operations - Oracle [] ExplanatioUnlike 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 pointer representation depends on its type). The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Visit Microsoft Q&A to post new questions. Why is this sentence from The Great Gatsby grammatical? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Hence there is no loss in data. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This is an old C callback mechanism so you can't change that. In such condition type conversion (type promotion) takes place to avoid loss of data. A pointer converted to an integer of sufficient size and back to the same pointer type is guaranteed to have its original value, otherwise the resulting pointer cannot be dereferenced safely ( the round-trip conversion in the opposite direction is not guaranteed [.]) rev2023.3.3.43278. Implementing From will result in the Into implementation but not vice-versa. } SCAN_END_SINGLE(ATTR) The high-order 9 bits of the number are used to hold a flag value, and the result is converted back into a pointer. then converted back to pointer to void, and the result will compare Even though what you say regarding the lifetime of the object is true, integral types are too limited for a generic API. linux c-pthreads: problem with local variables. Properly casting a `void*` to an integer in C++ 24,193 Solution 1 I think using intptr_t is the correct intermediate here, since it's guaranteed to be large enough to contain the integral value of the void*, and once I have an integer value I can then truncate it without causing the compiler to complain. If this is the data to a thread procedure, then you quite commonly want to pass by value. I need to cast the int from the first function so that I can use it as an argument for the second function. The dynamic_cast<>operator provides a way to check the actual type of a pointer to a polymorphic class. The problem is not with casting, but with the target type loosing half of the pointer. However the actual code in question contains an explicit c-style cast to int. I understood, but that would introduce dynamic memory and ugly lifetime issues (an object allocated by one thread must be freed by some other) - all just to pass an. @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. Type casting is when you assign a value of one primitive data type to another type. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You are just making it bigger by tricking the compiler and the ABI. 471,961 Members | 900 Online. Example: int x=7, y=5; float z; z=x/y; /*Here the value of z is 1*/. For the second example you can make sure that sizeof (int) <= sizeof (void *) by using a static_assert -- this way at least you'll get a notice about it. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. I'm only guessing here, but I think what you are supposed to do is actually pass the address of the variable to the function. Thanks for pointing that out. The most general answer is - in no way. Wrong. to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj (i.e. For the Nozomi from Shinagawa to Osaka, say on a Saturday afternoon, would tickets/seats typically be available - or would you need to book? Casting int to void* : r/C_Programming - reddit What does casting to void* does when passing arguments to variadic functions? - the incident has nothing to do with me; can I use this this way? Whats the grammar of "For those whose stories they are"? So you could do this: Note: As sbi points out this would require a change on the OP call to create the thread. If the value in a pointer is cast to a different type and it does not have the correct alignment for the new type, the behavior is undefined. void* -> integer -> void* rather than integer -> void* -> integer. Please tell me error: cast from 'void*' to 'int' loses precision, How Intuit democratizes AI development across teams through reusability. It is done by the compiler on its own, without any external trigger from the user. When is casting void pointer needed in C? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Use of Void pointers in C programming language vegan) just to try it, does this inconvenience the caterers and staff? sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller For example, if you want to store a 'long' value into a simple integer then you can type cast 'long' to 'int'. Asking for help, clarification, or responding to other answers. Yesterday, I updated Xcode to the newest version (5.1 (5B130a)) to compatible with iOS 7.1. The difference between the phonemes /p/ and /b/ in Japanese, Styling contours by colour and by line thickness in QGIS, AC Op-amp integrator with DC Gain Control in LTspice, Identify those arcade games from a 1983 Brazilian music video. A cast converts an object or value from one type to another. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? this way you won't get any warning. I don't see how anything bad can happen . Casting type void to uint8_t - Arduino Forum rev2023.3.3.43278. A cast is a way of explicitly informing the compiler that you intend to make the conversion and that you are aware that data loss might occur, or the cast may fail at run time. This page was last modified on 12 February 2023, at 18:25. To avoid truncating your pointer, cast it to a type of identical size. What is the purpose of non-series Shimano components? What does it mean to convert int to void* or vice versa? To learn more, see our tips on writing great answers. Mutually exclusive execution using std::atomic? What happens if you typecast as unsigned first? Your first example is risky because you have to be very careful about the object lifetimes. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? */void **MatrixIB (unsigned long x, unsigned long y, int size){ void *ptr; void **returnPtr; register unsigned long i, j; returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size); for (i=0, j=0; j returnPtr[j] = (void *) (ptr + i); // <<< Compile Errors, Error1error C2036: 'void *' : unknown sizec:\temp\testone\lib\utils.c57, 2> returnPtr[j] = (void *) ((long*)ptr + i); // <<< No compile errors, 3> returnPtr[j] = (void *) ((char*)ptr + i); // <<< No compile errors. Replacing broken pins/legs on a DIP IC package, How to handle a hobby that makes income in US. You need to cast the void* pointer to a char* pointer - and then dereference that char* pointer to give you the char that it points to! To learn more, see our tips on writing great answers. you can pass the int value as void pointer like (void *)&n where n is integer, and in the function accept void pointer as parameter like void foo(void *n);and finally inside the function convert void pointer to int like, int num = *(int *)n;. To learn more, see our tips on writing great answers. this way you won't get any warning. error: comparison between pointer and integer ('int' and 'string' (aka 'char *')), CS50 Caesar program is working but check50 says it isn't. Asking for help, clarification, or responding to other answers. C++ Tutorial => Conversion between pointer and integer what happens when we typecast normal variable to void* or any pointer variable? If you really need such trickery, then consider one of dedicated types, which are intptr_t and uintptr_t. Is it possible to create a concave light? Converts between types using a combination of implicit and user-defined conversions. This will only compile if the destination type is long enough. Why does setupterm terminate the program? If you do this, you have the thread reference a value that (hopefully still) lives in some other thread. As for the stack, I've written a few libraries using pthreds, thus I don't agree that what you describe "is quite often the case". eg. Or, they are all wrong. C - Type Casting - tutorialspoint.com In 64-bit programs, the size of the pointer is 64 bits, and cannot be put into the int type, which remains 32-bit in almost all systems. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. error: cast from pointer to smaller type 'unsigned int' loses My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? But this code pass the normal variable .. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); How to notate a grace note at the start of a bar with lilypond? Any expression can be cast to type void (which means that the result of the expression is ignored), but it's not legal to cast an expression of type void to type int not least because the result of such a cast wouldn't make any sense. The calculated expression consists of two operations. There is no "correct" way to store a 64-bit pointer in an 32-bit integer. : iPhone Retina 4-inch 64-bit) is selected. Thanks. But I'm nitpicking .. The main point is: a pointer has a platform dependent size. If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. with ids being an array of ints and touch being a pointer. The program can be set in such a way to ask the user to inform the type of data and . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. But gcc always give me a warning, that i cannot cast an int to a void*. On most platforms pointers and longs are the same size, but ints and pointers often are not the same size on 64bit platforms. What video game is Charlie playing in Poker Face S01E07? Press question mark to learn the rest of the keyboard shortcuts. The bigint data type is intended for use when integer values might exceed the range that is supported by the int data type.. bigint fits between smallmoney and int in the data type precedence chart.. @DavidHeffernan, sane thread APIs wouldn't send integral data to the thread procedures, they would send pointers. c - type casting integer to void* - Stack Overflow Implicit conversions - cppreference.com So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? B Programming Language | What is the History and Concept? Thanks for contributing an answer to Stack Overflow! ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Cast a smaller integer to a larger integer - community - The Rust The 32 remaining bits stored inside int are insufficient to reconstruct a pointer to the thread function. Bulk update symbol size units from mm to map units in rule-based symbology. Find centralized, trusted content and collaborate around the technologies you use most. Evaluate integer expressions in a larger size before comparing or assigning to that size.Note that (time_+t)-1 also complies with INT31-C-EX3. . My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Taking the above declarations of A, D, ch of the . How can this new ban on drag possibly be considered constitutional? Connect and share knowledge within a single location that is structured and easy to search. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. for (i=0, j=0; jType Casting in C Language with Examples - Dot Net Tutorials Disconnect between goals and daily tasksIs it me, or the industry? So,solution #3 works just fine. I personally upvoted this answer because by it's first line of text it helped me to understand the reason of this strange error message and what am I, poor idiot, doing :D. Not valid on Windows 64 - long is still 32-bit but pointers are 64-bit. "clang" "-Ilib\libopenvswitch.a.p" "-Ilib" "-I..\lib" "-I." Note:You might receive a runtime exception if the pointer contains a value unsuitable for the context. You use the address-of operator & to do that int x = 10; void *pointer = &x; And in the function you get the value of the pointer by using the dereference operator *: int y = * ( (int *) pointer); Share Improve this answer Follow edited Apr 15, 2013 at 13:58 answered Apr 15, 2013 at 13:53 Some programmer dude 394k 35 393 602 1 INT36-C. Converting a pointer to integer or integer to pointer My code is all over the place now but I appreciate you all helping me on my journey to mastery! use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD).

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cast to void *' from smaller integer type 'int