cast to void *' from smaller integer type 'int

Star 675. Maybe you can try this too. warning C4311: 'type cast': pointer truncation from 'void *' to 'long' in ECPG test files. 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. For the Nozomi from Shinagawa to Osaka, say on a Saturday afternoon, would tickets/seats typically be available - or would you need to book? The program can be set in such a way to ask the user to inform the type of data and . Replacing broken pins/legs on a DIP IC package, How to handle a hobby that makes income in US. For example, the main thread could wait for all of the other threads to end before terminating. The result is the same as implicit conversion from the enum's underlying type to the destination type. for saving RAM), use union, and make sure, if the mem address is treated as an int only if you know it was last set as an int. Can Martian regolith be easily melted with microwaves? You use the address-of operator & to do that. The most general answer is - in no way. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Why is there a voltage on my HDMI and coaxial cables? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, error: cast from void* to int loses precision, cast to pointer from integer of different size, pthread code. cast to void *' from smaller integer type 'int [Solved] Error "Cast from pointer to smaller type 'int' | 9to5Answer *PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning @ 2023-01-23 13:28 Hans de Goede 2023-01-23 13:56 ` Hans de Goede 0 siblings, 1 reply; 2+ messages in thread From: Hans de Goede @ 2023-01-23 13:28 UTC (permalink / raw) To: Mark Gross Cc: Hans de Goede, Andy Shevchenko, platform-driver-x86, kernel test robot Fix the following . There's no proper way to cast this to int in general case. Thanks for contributing an answer to Stack Overflow! A cast specifies a conversion from one type to another. All character types are to be converted to an integer. Asking for help, clarification, or responding to other answers. However, you are also casting the result of this operation to (void*). On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. Visit Microsoft Q&A to post new questions. If this is the data to a thread procedure, then you quite commonly want to pass by value. vegan) just to try it, does this inconvenience the caterers and staff? A sane compiler may throw a warning on lines like this but by no way it should throw an error, because this code is NOT wrong, it is just potentially error-prone, but can be perfectly valid. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Please note that the error I am receiving is "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0). Converting one datatype into another is known as type casting or, type-conversion. 4. Type Conversions - C in a Nutshell [Book] - O'Reilly Online Learning Unless you have a valid address at that value, you are going to invoke undefined behaviour when try to use that pointer. 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. Disconnect between goals and daily tasksIs it me, or the industry? But this code pass the normal variable .. 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. casting from int to void* and back to int. The problem just occur with Xcode 5.1. 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;. This is flat out wrong. Notifications. Making statements based on opinion; back them up with references or personal experience. This forum has migrated to Microsoft Q&A. To learn more, see our tips on writing great answers. For example, if youwrite ((int*)ptr + 1), it will add 4 bytes to the pointer, because "ints" are 4 bytes each. that any valid pointer to void can be converted to this type, then Remembering to delete the pointer after use so that we don't leak. Why is there a voltage on my HDMI and coaxial cables? Changing the type of ids would be the cleanest solution, but I decided against it when being confronted with this issue myself, as it only introduced a lot of issues with other code that is relying on ids being an int-array. In a 64bit build a pointer is 64bit (contrary to a 32bit build, where it is 32bit), while an int is 32bit, so this assignment stores a 64bit value in a 32bit storage, which may result in a loss of information. So you know you can cast it back like this. to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj I think the solution 3> should be the correct one. rev2023.3.3.43278. This is memory reinterpretation - a completely unacceptable way to do what the OP is trying to do. */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. The compiler issues the "cast from integer to pointer of different size" warning whenever the value of an integer is converted to a pointer, especially when the memory allocated to a pointer is smaller than the memory allocated to an integer data type. Put your define inside a bracket: without a problem. Compile error on Android ARM Issue #163 cisco/ChezScheme Number Type Cast | Qt Forum Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Offline ImPer Westermark over 11 years ago in reply to Andy Neil Except that you sometimes stores an integer in the pointer itself. What you do here is undefined behavior, and undefined behavior of very practical sort. If the value is ever used as pointer again that will prove to be an extremely bad idea. I get the error: "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0), How Intuit democratizes AI development across teams through reusability. */ >> -bool >> +enum conversion_safety >> unsafe_conversion_p (tree type, tree expr, bool . SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); Can we typecast void into int? - Quora you can just change architecture to support 32 bit compilation by all below in in Build Settings. Don't do that. Asking for help, clarification, or responding to other answers. This is what the second warning is telling you. On most platforms pointers and longs are the same size, but ints and pointers often are not the same size on 64bit platforms. 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! But you seem to suggest by your answer that the user can pass 5 to pthread_create and then perform the above cast to get it back. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. Alternatively, if you choose to castthe ptr variableto (size_t) instead, then you don't need to worry about the pointer typeanymore. This is why you got Error 1 C2036, from your post. } SCAN_END_SINGLE(ATTR) static_cast conversion - cppreference.com returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size); The text was updated successfully, but these errors were encountered: You signed in with another tab or window. Most answers just try to extract 32 useless bits out of the argument. To cast such pointers to 32-bit types and vice versa special functions are used: void * Handle64ToHandle ( const void * POINTER_64 h ) void * POINTER_64 HandleToHandle64 ( const void *h ) long HandleToLong ( const void *h ) unsigned long HandleToUlong ( const void *h ) You can convert the values from one type to another explicitly using the cast operator as follows (type_name) expression Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. - the incident has nothing to do with me; can I use this this way? error: cast from pointer to smaller type 'unsigned int' loses Find centralized, trusted content and collaborate around the technologies you use most. void* -> integer -> void* rather than integer -> void* -> integer. error: cast from 'void*' to 'int' loses precision - Stack Overflow [that could be a TODO - not to delay solving the ICE]. Use returnPtr[j] = (void *) ((long)ptr + i); ). Bulk update symbol size units from mm to map units in rule-based symbology. Otherwise, if the original pointer value points to an object a, and there is an object b of the . even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. [PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Java Type Casting (With Examples) - Programiz Issues. You are correct, but cocos actually only uses that address as a unique id. Wrong. Does melting sea ices rises global sea level? cast to 'double *' from smaller integer type 'unsigned int' The C compiler is gcc, clang version 3.9.1, target aarch64--linux-android, thread model posix. C/C++ , Cerror: cast to 'void *' from smaller integer type 'int'. 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. I have a two functions, one that returns an int, and one that takes a const void* as an argument.

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