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I agree passing a dynamically allocated pointer is fine (and I think the best way). Issues. Even though what you say regarding the lifetime of the object is true, integral types are too limited for a generic API. An object pointer (including void*) or function pointer can be converted to an integer type using reinterpret_cast. 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. Whats the grammar of "For those whose stories they are"? I have the following function and when I compile it under VS.NET 2005, the following compile warnings show up: Warning1warning C4311: 'type cast' : pointer truncation from 'void *' to 'long'c:\temp\testone\lib\utils.c56Warning2warning C4312: 'type cast' : conversion from 'unsigned long' to 'void *' of greater sizec:\temp\testone\lib\utils.c56, Code Snippet Maybe you can try this too. This page has been accessed 1,655,678 times. On most platforms pointers and longs are the same size, but ints and pointers often are not the same size on 64bit platforms. The only alternative is really to take time and fix all 64-bit code issues, of which there may be some non-trivial issues. ^~~~~~~~~~~~~~~~~~~~~ Wrong. What is the purpose of non-series Shimano components? Already on GitHub? The reinterpret_cast makes the int the size of a pointer and the warning will stop. This example is noncompliant on an implementation where pointers are 64 bits and unsigned integers are 32 bits because the result of converting the 64-bit ptr cannot be represented in the 32-bit integer type. 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. Remembering to delete the pointer after use so that we don't leak. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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. That's not a good idea if the original object (that was cast to void*) was an integer. We have to pass address of the variable to the function because in function definition argument is pointer variable. The most general answer is - in no way. This is not even remotely "the correct answer". Asking for help, clarification, or responding to other answers. Only the following conversions can be done with static_cast, except when such conversions would cast away constness or volatility. What you do here is undefined behavior, and undefined behavior of very practical sort. B language was designed to develop . Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? In the case of Widening Type Casting, the lower data type (having smaller size) is converted into the higher data type (having larger size). 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.. Use returnPtr[j] = (void *) ((long)ptr + i); ). Making statements based on opinion; back them up with references or personal experience. to the original pointer: The following type designates an unsigned integer type with the Making statements based on opinion; back them up with references or personal experience. return ((void **) returnPtr);} /* Matrix() */. To be honest, I think, clang is too restrictive here. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. If the original pointer value represents an address of a byte in memory that does not satisfy the alignment requirement of the target type, then the resulting pointer value is unspecified. While working with Threads in C, I'm facing the warning, "warning: cast to pointer from integer of different size". But then you need to cast your arguments inside your thread function which is quite unsafe cf. What video game is Charlie playing in Poker Face S01E07? C++ how to get the address stored in a void pointer? 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). What does casting to void* does when passing arguments to variadic functions? cast to 'void *' from smaller integer type 'int' Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. This allows you to reinterpret the void * as an int. Asking for help, clarification, or responding to other answers. In C (int)b is called an explicit conversion, i.e. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Compile error on Android ARM Issue #163 cisco/ChezScheme LLNL's tutorial is bad and they should feel bad. Connect and share knowledge within a single location that is structured and easy to search. BUT converting a pointer to void* and back again is well supported (everywhere). Can anybody explain how to pass an integer to a function which receives (void * ) as a parameter? SCAN_PUT(ATTR, NULL); There's no proper way to cast this to int in general case. Casting type void to uint8_t - Arduino Forum It generally takes place when in an expression more than one data type is present. How to correctly cast a pointer to int in a 64-bit application? Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. AC Op-amp integrator with DC Gain Control in LTspice. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? this way you won't get any warning. Not the answer you're looking for? The int data type is the primary integer data type in SQL Server. I am compiling this program in linux gcc compiler.. An open (void) pointer can hold a pointer of any type. Why is this sentence from The Great Gatsby grammatical? Casting type int to const void* - C / C++ 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. 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. Example: int x=7, y=5; float z; z=x/y; /*Here the value of z is 1*/. The result is the same as implicit conversion from the enum's underlying type to the destination type. So make sure you understand what you are doing! - the incident has nothing to do with me; can I use this this way? A cast converts an object or value from one type to another. *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 . What is "cast from integer to pointer of different size" warning? Thanks for pointing that out. arrays - I get the error: "cast to smaller integer type 'int' from How to convert a factor to integer\numeric without loss of information? If your standard library (even if it is not C99) happens to provide these types - use them. Does Counterspell prevent from any further spells being cast on a given turn? You are just making it bigger by tricking the compiler and the ABI. How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? It's an int type guaranteed to be big enough to contain a pointer. The following behavior-changing defect reports were applied retroactively to previously published C++ standards. Why do small African island nations perform better than African continental nations, considering democracy and human development? C / C++ Forums on Bytes. A long long would not work for 32bit systems and a long would not work for 64 bit Windows (while 64bit Unix and Unix-like systems like OS X use the LP64 data model, in which a long is 64bit, 64bit Windows uses the LLP64 data model, in which a long has a size of 32bit (http://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models)). Please help me compile Chez Scheme. This forum has migrated to Microsoft Q&A. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What is the purpose of non-series Shimano components? rev2023.3.3.43278. Connect and share knowledge within a single location that is structured and easy to search. 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: ids [i] = (int) (size_t)touch; Projects. linux c-pthreads: problem with local variables. However, I believe that even if the define was for the "65536", it would not be what @kaetzacoatl wanted. 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 learn more, see our tips on writing great answers. /** Dynamically allocate a 2d (x*y) array of elements of size _size_ bytes. "clang" "-Ilib\libopenvswitch.a.p" "-Ilib" "-I..\lib" "-I." The proper way is to cast it to another pointer type. (int) pthread_self() 64int48intuintptr_t (unsigned int) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~. Such pointers can be stored in 32-bit data types (for instance, int, DWORD). To learn more, see our tips on writing great answers. "-D_FILE_OFFSET_BITS=64" "-Wall" "-Winvalid-pch" "-g" "-Wthread-safety" "-Wno-microsoft-enum-forward-reference" "-Wno-unused-function" "-Wno-sometimes-unini ), Styling contours by colour and by line thickness in QGIS. There exist two main syntaxes for generic type-casting: functional and c-like: 1 2 3 4 double x = 10.3; int y; y = int (x); // functional notation y = (int) x; // c-like cast notation The functionality of these generic forms of type-casting is enough for most needs with fundamental data types. To learn more, see our tips on writing great answers. you can just change architecture to support 32 bit compilation by all below in in Build Settings. Asking for help, clarification, or responding to other answers. Casting an open pointer to other pointer types and casting other pointer types to an open pointer does not result in a compile time error. Can I tell police to wait and call a lawyer when served with a search warrant? Does Counterspell prevent from any further spells being cast on a given turn? Bulk update symbol size units from mm to map units in rule-based symbology. If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. 4. Type Conversions - C in a Nutshell [Book] - O'Reilly Online Learning See also this documentation.. From and Into are generally intended to be lossless, infalliable conversions.as on the other hand can discard data and lead to bugs in some situations, for example casting a u64 to a usize may truncate the value on a 32-bit host. Thanks for contributing an answer to Stack Overflow! vegan) just to try it, does this inconvenience the caterers and staff? Here is my code: I already tried (void*)M_TABLE_SIZE but then I get an error that I cannot use the * operator. SCAN_PUT(ATTR, NULL); Converting one datatype into another is known as type casting or, type-conversion. What is the point of Thrower's Bandolier? It is done by the compiler on its own, without any external trigger from the user. Making statements based on opinion; back them up with references or personal experience. From that point on, you are dealing with 32 bits. @Martin York: No, it doesn't depend on endiannness. 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. If any, how can the original function works without errors if we just ignore the warning. Does a summoned creature play immediately after being summoned by a ready action? STR34-C. Does melting sea ices rises global sea level? Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. You think by casting it here that you are avoiding the problem! (Also, check out how it prints "5" twice), passing a unique pointer to each thread wont race, and you can get/save any kind of information in the th struct. C - Type Casting - tutorialspoint.com 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. 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;. ^~~~~~~~~~~~~~~~~~~ Why does setupterm terminate the program? SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); Actions. Not the answer you're looking for? Then i can continue compiling. I would create a structure and pass that as void* to pthread_create. Making statements based on opinion; back them up with references or personal experience. The text was updated successfully, but these errors were encountered: You signed in with another tab or window. If that happens soon after the call to pthread_create() then you have a race condition, because there's a chance that the thread will attempt to read x's value after it's life has ended, which invokes undefined behavior. ERROR: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int', error: cast to 'string' (aka 'char *') from smaller integer type 'int' [-Werror,-Wint-to-pointer-cast], error: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int' C, warning: initialization of 'unsigned char' from 'uint8_t *' {aka 'unsigned char *'} makes integer from pointer without a cast [-Wint-conversion], Minimising the environmental effects of my dyson brain. If you call your thread creation function like this, then the void* arriving inside of myFcn has the value of the int you put into it. 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. ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] So you know you can cast it back like this. 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. Did i have to face to unexpected runtime issues, i guess not, i've found another discussion on this -. "because the type "int" supports only -32768 ~ 32768" This is not true for any modern desktop or mobile OS or any OS that is targeted by cocos2d-x. 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. Are there tables of wastage rates for different fruit and veg? This is what the second warning is telling you. Java Type Casting (With Examples) - Programiz You need to pass an actual pointer. This is why you got Error 1 C2036, from your post. I have looked around and can't seem to find any information on how to do this. Mutually exclusive execution using std::atomic? STR34-C. Cast characters to unsigned char before converting to larger The pointer doesn't actually point to anything, but it's the result of an earlier cast from an integer to a pointer (e.g. what happens when we typecast normal variable to void* or any pointer variable? If the source type is bool, the value false is converted to zero and the value true is converted to the value one of the destination type (note that if the destination type is int, this is an integer promotion, not an integer conversion). That could create all kinds of trouble. What happens if you typecast as unsigned first? Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? } SCAN_END_SINGLE(ATTR) C/C++ , Cerror: cast to 'void *' from smaller integer type 'int'. 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. I need to cast the int from the first function so that I can use it as an argument for the second function. sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller Not the answer you're looking for? How to correctly type cast (void*)? - social.msdn.microsoft.com XCode 5.1 is change all architecture to 64 bit. how to cascade 2d int array to 2d void pointer array? Thanks for contributing an answer to Stack Overflow! equal to the original pointer: First you are using a define, which is not a variable. [Solved] Error "Cast from pointer to smaller type 'int' | 9to5Answer 7.1 New Cast Operations The C++ standard defines new cast operations that provide finer control than previous cast operations. As was pointed out by Martin, this presumes that sizeof(void*)>=sizeof(int). Keep in mind that thrArg should exist till the myFcn() uses it. Hence there is no loss in data. You can use a 64 bits integer instead howerver I usually use a function with the right prototype and I cast the function type : windows meson: cast to smaller integer type 'unsigned long' from 'void Type Casting in C Language with Examples - Dot Net Tutorials Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Why does Mister Mxyzptlk need to have a weakness in the comics? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ lexborisov Modest Public. Put your define inside a bracket: without a problem. this way I convert an int to a void* which is much better than converting a void* to an int. Use #include to define it. In the first example, the variable c1 of the char type is converted to a temporary variable of the int type, because the second operand in the division operation, the constant 2, is of the higher type int. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Xcode 5 and iOS 7: Architecture and Valid architectures, xcode build error: Semantic issue cast from pointer to smaller type 'int' loses information, Issues in handling touches on subviews(uiviews) in UIScrollView, Architecture linking error after Xcode 5.1 upgrade, iOS 7.1 gives error after updating to Xcode 5.1, Linker error in Xcode 5.1 with cocos2d-x 3 beta 2. Is a PhD visitor considered as a visiting scholar. Then I build my project, I get the error "Cast from pointer to smaller type 'int' loses information" in EAGLView.mm file (line 408) when 64-bit simulators (e.g. 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. Re: [PATCH, PR 53001] Re: Patch to split out new warning flag for Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. rev2023.3.3.43278. 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. Before I update Xcode, my project still can build and run normally with all devices. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD). Is it possible to create a concave light? Can I tell police to wait and call a lawyer when served with a search warrant? Using an integer address (like &x) is probably wrong, indeed each modification you will execute on x will affect the pass behaviour. SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul Yesterday, I updated Xcode to the newest version (5.1 (5B130a)) to compatible with iOS 7.1. this question. The cast back to int * is not, though. Replacing broken pins/legs on a DIP IC package, AC Op-amp integrator with DC Gain Control in LTspice. ../lib/odp-util.c:5603:13: note: expanded from macro 'SCAN_PUT' How Intuit democratizes AI development across teams through reusability. Using Kolmogorov complexity to measure difficulty of problems? Bulk update symbol size units from mm to map units in rule-based symbology. Therefore it is perfectly valid for the compiler to throw an error for a line like.