What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Implementing From will result in the Into implementation but not vice-versa. Not the answer you're looking for? If any, how can the original function works without errors if we just ignore the warning. Based on the design of this function, which modification is right. Using Kolmogorov complexity to measure difficulty of problems? The preprocessor will replace your code by this: This is unlikely what you are trying to do. How can this new ban on drag possibly be considered constitutional? That's probably going to be true for most platforms you will ever encounter, but it's not a guarantee; it's implementation-dependent. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. Therefore, you need to change it to long long instead of long in windows for 64 bits. It is easier to understand and write than any other assembly language. This is flat out wrong. rev2023.3.3.43278. rev2023.3.3.43278. Bulk update symbol size units from mm to map units in rule-based symbology. rev2023.3.3.43278. How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. this way I convert an int to a void* which is much better than converting a void* to an int. Thanks for contributing an answer to Stack Overflow! If you do this, you have the thread reference a value that (hopefully still) lives in some other thread. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This is a fine way to pass integers to new pthreads, if that is what you need. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. A cast specifies a conversion from one type to another. Sign in what happens when we typecast normal variable to void* or any pointer variable? How to tell which packages are held back due to phased updates, Identify those arcade games from a 1983 Brazilian music video. LLNL's tutorial is bad and they should feel bad. Casting int to void* loses precision, and what is the solution in required cases, c++: cast from "const variable*" to "uint32" loses precision, Recovering from a blunder I made while emailing a professor, Relation between transaction data and transaction id. Can Martian regolith be easily melted with microwaves? Implementation-dependent. How to use Slater Type Orbitals as a basis functions in matrix method correctly? Please help me compile Chez Scheme. A nit: in your version, the cast to void * is unnecessary. Disconnect between goals and daily tasksIs it me, or the industry? @Martin York: No, it doesn't depend on endiannness. 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. So the compiler is very picky here and the correct solution to make the code compile again and still let it show the exact same behavior like in Xcode 5.0 is to first cast to an integer type with a size that matches the one of a pointer and to then do a second cast to the int that we actually want: I am using size_t here, because it is always having the same size as a pointer, no matter the platform. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Unless you have a valid address at that value, you are going to invoke undefined behaviour when try to use that pointer. The OP wanted to convert a pointer value to a int value, instead, most the answers, one way or the other, tried to wrongly convert the content of arg points to to a int value. rev2023.3.3.43278. Does melting sea ices rises global sea level? whether it was an actual problem is a different matter though. If it's anything like cocos2d-iphone v2.x and just based on this slice of code in a core class I wager it's safe to say that cocos2d-x 2.x also is not compatible with 64 bit code, and you can expect all kinds of issues (not just compile-time but also runtime). C / C++ Forums on Bytes. 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". You should perform type conversion based on 64bit build system because the type "int" supports only -32768 ~ 32768. If we want to get the exact value of 7/5 then we need explicit casting from int to float: Example: int x=7, y=5; The calculated expression consists of two operations. Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul Linear regulator thermal information missing in datasheet. Type casting is when you assign a value of one primitive data type to another type. how to cascade 2d int array to 2d void pointer array? void* to an array - C++ Forum - cplusplus.com Asking for help, clarification, or responding to other answers. You think by casting it here that you are avoiding the problem! /** Dynamically allocate a 2d (x*y) array of elements of size _size_ bytes. 471,961 Members | 900 Online. 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. Floating-point conversions Fix for objc/45925 You can use a 64 bits integer instead howerver I usually use a function with the right prototype and I cast the function type : To learn more, see our tips on writing great answers. Fork 63. The difference between the phonemes /p/ and /b/ in Japanese. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? This page has been accessed 1,655,678 times. You can only do this if you use a synchronization primitive to ensure that there is no race condition. 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. Notifications. As Ferruccio said, int must be replaced with intptr_t to make the program meaningful. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I am an entry level C programmer. Or, they are all wrong. ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' What happens if you typecast as unsigned first? Pd = Pa; Similarly, Pc may be type cast to type int and assigned the value Pa. 1. It is commonly called a pointer to T and its type is T*. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Note the difference between the type casting of a variable and type casting of a pointer. reinterpret_cast conversion - cppreference.com Casting and type conversions - C# Programming Guide 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. Is pthread_join a must when using pthread in linux? How to notate a grace note at the start of a bar with lilypond? When is casting void pointer needed in C? However even though their types are different, the address is going to be the same. Casting arguments inside the function is a lot safer. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. C++ how to get the address stored in a void pointer? Typecasting - Data Types - Language Basics - MQL4 Reference Using indicator constraint with two variables. SCAN_PUT(ATTR, NULL); Mutually exclusive execution using std::atomic? ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' What is the difference between const int*, const int * const, and int const *? Thanks for contributing an answer to Stack Overflow! Making statements based on opinion; back them up with references or personal experience. SCAN_PUT(ATTR, NULL); It's always a good practice to put your #define's in brackets to avoid such surprise. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? If you preorder a special airline meal (e.g. [PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning For the remaining integral types, the result is the value of the enum if it can be represented by the target type and unspecified otherwise. 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. 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. equal to the original pointer: First you are using a define, which is not a variable. and how to print the thread id of 2d array argument? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Noncompliant Code Example (memset())For historical reasons, certain C Standard functions accept an argument of type int and convert it to either unsigned char or plain char. In both cases, converting the pointer to an integer type that's too small to represent all pointer values is a bug. *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 . If your standard library (even if it is not C99) happens to provide these types - use them. 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. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. iphone - Error "Cast from pointer to smaller type 'int' loses Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? It generally takes place when in an expression more than one data type is present. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to correctly cast a pointer to int in a 64-bit application? *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 . Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Get the address of a callback function to call dynamically in C++, error: call of overloaded function ambiguous, error: cast from to unsigned int loses precision [-fpermissive]. Is it possible to create a concave light? Error while setting app icon and launch image in xcode 5.1. And, most of these will not even work on gcc4. static_cast on the other hand should deny your stripping away the const qualifier. On all of them int is 32bit, not 16bit. ", "!"? If the destination type is bool, this is a boolean conversion (see below). To learn more, see our tips on writing great answers. The problem was there before, you just are being notified of it. This is not a conversion at all. error: cast from pointer to smaller type 'unsigned int' loses information. In this case, casting the pointer back to an integer is meaningless, because . Now, what happens when I run it with the thread sanitizer? . Asking for help, clarification, or responding to other answers. Converts between types using a combination of implicit and user-defined conversions. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Making statements based on opinion; back them up with references or personal experience. ^~~~~~~~~~~~~~~~~~~~~ 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. Whats the grammar of "For those whose stories they are"? You can use any other pointer, or you can use (size_t), which is 64 bits. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Why did Ukraine abstain from the UNHRC vote on China? should we also have a diagnostic for the (presumed) user error? Using Kolmogorov complexity to measure difficulty of problems? You just need to suppress the warning, and this will do it: This may offend your sensibilities, but it's very short and has no race conditions (as you'd have if you used &i). You are getting warnings due to casting a void* to a type of a different size. @jackdoe: It's a waste of human life to write code that "you may need in the future". The cast back to int * is not, though. (i.e. Java Type Casting (With Examples) - Programiz What is the point of Thrower's Bandolier? How do I check if a string represents a number (float or int)? Replacing broken pins/legs on a DIP IC package, AC Op-amp integrator with DC Gain Control in LTspice. pthread create managing values generated in function (in c), Establishing TCP socket connection between PHP client and C server on Ubuntu. Java Type Casting. Click to see the query in the CodeQL repository. To perform a cast, specify the type that you are casting to in parentheses in front of the value or variable to be converted. clang11 report error: cast to smaller integer type #82 - GitHub ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] Actions. [Solved] Error "Cast from pointer to smaller type 'int' | 9to5Answer Thanks for contributing an answer to Stack Overflow! This is memory reinterpretation - a completely unacceptable way to do what the OP is trying to do. Otherwise, if the original pointer value points to an object a, and there is an object b of the . Disconnect between goals and daily tasksIs it me, or the industry? 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). arrays - I get the error: "cast to smaller integer type 'int' from Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Yeah, the tutorial is doing it wrong. Connect and share knowledge within a single location that is structured and easy to search. 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. C99 defines the types "intptr_t" and "uintptr_t" which do . How create a simple program using threads in C? To learn more, see our tips on writing great answers. However the actual code in question contains an explicit c-style cast to int. : iPhone Retina 4-inch 64-bit) is selected. So you could do this: Note: As sbi points out this would require a change on the OP call to create the thread. It solved my problem too. I have looked around and can't seem to find any information on how to do this. I don't see how anything bad can happen . Cast unsigned char (uint8 *) pointer to unsigned long (uint32 *) pointer Thanks for pointing that out. Referring to N1570 7.20.1.4/p1 (Integer types capable of holding object pointers): The following type designates a signed integer type with the property 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! What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? 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. Not the answer you're looking for? privacy statement. actually no, as int my be a smaller type than a pointer ;-) But, of course with int64_t it works fine. 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. Cast a smaller integer to a larger integer - community - The Rust 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. 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 integer casts in specific, using into() signals that . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. Implicit conversions - cppreference.com Where does this (supposedly) Gibson quote come from? Recovering from a blunder I made while emailing a professor. static_cast conversion - cppreference.com . How to use Slater Type Orbitals as a basis functions in matrix method correctly? STR34-C. Cast characters to unsigned char before converting to larger In such condition type conversion (type promotion) takes place to avoid loss of data. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Setting a buffer of char* with intermediate casting to int*. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Usually that means the pointer is allocated with. So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. 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. property that any valid pointer to void can be converted to this type, This explicit cast clearly tells the compiler "Shut up, I know that this code does not look correct, but I do know what I am doing". The subreddit for the C programming language, Press J to jump to the feed. Using an integer address (like &x) is probably wrong, indeed each modification you will execute on x will affect the pass behaviour. By clicking Sign up for GitHub, you agree to our terms of service and From what I read about casting in the C11 standard, my feeling is, that it is arguable to emit a warning on an explicit conversion. The code ((void*)ptr + 1) does not work, because the compiler has no idea what size "void" is, and therefore doesn't know how many bytes to add. Casting Pointers - IBM 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. Implicit Type Conversion in C with Examples - GeeksforGeeks I usually have all automatic conversion warnings effective when developing in C, and I use explicit casting in order to suppress a specific . */void **MatrixIB (unsigned long x, unsigned long y, int size){ void *ptr; void **returnPtr; register unsigned long i, j; The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. Can Martian regolith be easily melted with microwaves? Implicit Type Conversion is also known as 'automatic type conversion'. Identify those arcade games from a 1983 Brazilian music video. All float types are to be converted to double. ", "? Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. Find centralized, trusted content and collaborate around the technologies you use most. The difference between a and &a is the type. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? How to use Slater Type Orbitals as a basis functions in matrix method correctly? Remarks. Casting type void to uint8_t - Arduino Forum By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Thanks Jonathan, I was thinking about my answer in another thread: AraK is correct, passing integers a pointers are not necessarily interchangeable. Narrowing Casting (manually) - converting a larger type to a . To access the object value, use the * dereference operator: int * p; assert (p == null ); p = new int (5); assert (p != null ); assert (*p == 5); (*p)++; assert (*p == 6); If a pointer contains a null value, it is not pointing to a valid object. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @Dinesh: could you please 1) show us those.
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