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. Can Martian regolith be easily melted with microwaves? clang11 report error: cast to smaller integer type #82 - GitHub If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. converted back to pointer to void, and the result will compare equal The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. Find centralized, trusted content and collaborate around the technologies you use most. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 4. Type Conversions - C in a Nutshell [Book] - O'Reilly Online Learning This is why you got Error 1 C2036, from your post. For a fairly recent compiler (that supports C99) you should not store or represent address as plain int value. If not, check the pointer size on your platform, define these typedefs accordingly yourself and use them. Don't pass your int as a void*, pass a int* to your int, so you can cast the void* to an int* and copy the dereferenced pointer to your int. Implicit Type Conversion in C with Examples - GeeksforGeeks However, I believe that even if the define was for the "65536", it would not be what @kaetzacoatl wanted. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Not the answer you're looking for? 471,961 Members | 900 Online. The problem was there before, you just are being notified of it. So make sure you understand what you are doing! 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. Using printf with a pointer to float gives an error, Meaning of int (*) (int *) = 5 (or any integer value), Casting int to void* loses precision, and what is the solution in required cases, Acidity of alcohols and basicity of amines. this way you won't get any warning. Where does this (supposedly) Gibson quote come from? c - Cast int to void* - Stack Overflow Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). This is a fine way to pass integers to new pthreads, if that is what you need. Thanks for contributing an answer to Stack Overflow! FAILED: lib/libopenvswitch.a.p/odp-util.c.obj Asking for help, clarification, or responding to other answers. Implicit conversions - cppreference.com Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. However the actual code in question contains an explicit c-style cast to int. */ >> -bool >> +enum conversion_safety >> unsafe_conversion_p (tree type, tree expr, bool . p-util.c.obj "-c" ../lib/odp-util.c cast to void *' from smaller integer type 'int If you need to keep the returned address, just keep it as void*. returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size);
So reinterpret_cast has casted it to long type and then static_cast safely casts long to int, if you are ready do truncte the data. Not the answer you're looking for? *sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller integer type 'enum aic32x4_type' from 'void *' @ 2022-04-22 9:48 kernel test robot 0 siblings, 0 . warning C4311: 'type cast': pointer truncation from 'void *' to 'long' in ECPG test files. Identify those arcade games from a 1983 Brazilian music video, Relation between transaction data and transaction id, The difference between the phonemes /p/ and /b/ in Japanese. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Most answers just try to extract 32 useless bits out of the argument. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? How can this new ban on drag possibly be considered constitutional? This returns the first 32 bits of the pointer which may be the top or the bottom depending on big versus little endian, as comment #2 said. Why does setupterm terminate the program? 7.1 New Cast Operations The C++ standard defines new cast operations that provide finer control than previous cast operations. 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. with ids being an array of ints and touch being a pointer. But the problem has still happened. vegan) just to try it, does this inconvenience the caterers and staff? If this is the data to a thread procedure, then you quite commonly want to pass by value. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Passing arguments to pthread_create - invalid conversion from void(*)() to void(*)(void*). ../lib/odp-util.c:5603:13: note: expanded from macro 'SCAN_PUT' (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. I agree passing a dynamically allocated pointer is fine (and I think the best way). 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;. What I am saying is that it would be safer to use new(5) rather than 5 and deal with it appropriately at the other end. If the function had the correct signature you would not need to cast it explicitly. Error while setting app icon and launch image in xcode 5.1. Basically its a better version of (void *)i. Cast Operations - Oracle The problem is not with casting, but with the target type loosing half of the pointer. A cast specifies a conversion from one type to another. From that point on, you are dealing with 32 bits. If any, how can the original function works without errors if we just ignore the warning. I have looked around and can't seem to find any information on how to do this. ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. LLNL's tutorial is bad and they should feel bad. this question. ), For those who are interested. This will get you a pointer from a 32 bit offset: A function pointer is incompatible to void* (and any other non function pointer). that any valid pointer to void can be converted to this type, then I am compiling this program in linux gcc compiler.. What is the point of Thrower's Bandolier? ", "? What is the difference between const int*, const int * const, and int const *? C99 standard library provides intptr_t and uintptr_t typedefs, which are supposed to be used whenever the need to perform such a cast comes about. The int data type is the primary integer data type in SQL Server. Projects. and how to print the thread id of 2d array argument? Thanks for contributing an answer to Stack Overflow! long guarantees a pointer size on Linux on any machine. Api says this is how i should create thread: So if I want to pass an int what I think I should do is: The second example assumes that a pointer is wide enough to store an int. How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. The cast back to int * is not, though. @kshegunov said in Number Type Cast: const void * x; int y = int (x); compiles just fine. sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller rev2023.3.3.43278. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? Just edited. */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
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