SCAN_PUT_ATTR(key, ATTR, skey, FUNC); warning C4311: 'type cast': pointer truncation from 'void *' to 'long' in ECPG test files. I think the solution 3> should be the correct one. 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. c - type casting integer to void* - Stack Overflow 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 If you really need such trickery, then consider one of dedicated types, which are intptr_t and uintptr_t. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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). To learn more, see our tips on writing great answers. 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. If pointers are 64 bits and ints are 32 bits, an int is too small to hold a pointer value. I'm using cocos2d-x-2.2.2. Type Casting in C Language with Examples - Dot Net Tutorials However, you are also casting the result of this operation to (void*). Asking for help, clarification, or responding to other 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;. 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). Functions return bigint only if the parameter expression is a bigint data type. Just edited. Fork 63. This page has been accessed 1,655,678 times. I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread. 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. The calculated expression consists of two operations. 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). You are correct, but cocos actually only uses that address as a unique id. Implicit conversions - cppreference.com The correct answer is, if one does not mind losing data precision. 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. Clang warnings for an invalid casting? - The FreeBSD Forums INT31-C. Ensure that integer conversions do not result in lost or SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); However, I believe that even if the define was for the "65536", it would not be what @kaetzacoatl wanted. Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. But gcc always give me a warning, that i cannot cast an int to a void*. The text was updated successfully, but these errors were encountered: You signed in with another tab or window. How do I force make/GCC to show me the commands? Mutually exclusive execution using std::atomic? Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? rev2023.3.3.43278. Converts between types using a combination of implicit and user-defined conversions. Your first example is risky because you have to be very careful about the object lifetimes. GitHub. @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. Why is this sentence from The Great Gatsby grammatical? If the sizes are different then endianess comes into play. So,solution #3 works just fine. Use returnPtr[j] = (void *) ((long)ptr + i); ). Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? 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. Taking the above declarations of A, D, ch of the . ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' 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. 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. 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. (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. what does it mean to convert int to void* or vice versa? 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. Typecasting - Data Types - Language Basics - MQL4 Reference 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;. STR34-C. Type casting is when you assign a value of one primitive data type to another type. whether it was an actual problem is a different matter though. Number Type Cast | Qt Forum It is done by the compiler on its own, without any external trigger from the user. Why is there a voltage on my HDMI and coaxial cables? Actions. This page was last modified on 12 February 2023, at 18:25. Thanks. Whats the grammar of "For those whose stories they are"? To perform a cast, specify the type that you are casting to in parentheses in front of the value or variable to be converted. Is pthread_join a must when using pthread in linux? 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 text was updated successfully, but these errors were encountered: It generally takes place when in an expression more than one data type is present. Cast unsigned char (uint8 *) pointer to unsigned long (uint32 *) pointer And then assign it to the double variable. The problem was there before, you just are being notified of it. How to Cast a void* ponter to a char without a warning? cast operators [edit] When an expression is used in the context where a value of a different type is expected, conversionmay occur: intn =1L;// expression 1L has type long, int is expectedn =2.1;// expression 2.1 has type double, int is expectedchar*p =malloc(10);// expression malloc(10) has type void*, char* is expected The preprocessor will replace your code by this: This is unlikely what you are trying to do. You are getting warnings due to casting a void* to a type of a different size. Connect and share knowledge within a single location that is structured and easy to search. How to correctly cast a pointer to int in a 64-bit application? It's always a good practice to put your #define's in brackets to avoid such surprise. But, sure, in that specific case you can pass a local variable address, type casting integer to void* [duplicate]. Re: [PATCH, PR 53001] Re: Patch to split out new warning flag for How to correctly type cast (void*)? - social.msdn.microsoft.com It is purely a compile-time directive which instructs the compiler to treat expression as if it had . In simple example code like this it's very easy to convince yourself that there's no problem, but in more elaborate real-world scenarios it's very easy to make this mistake inadvertently. Where does this (supposedly) Gibson quote come from? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. "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. Thanks for contributing an answer to Stack Overflow! This will only compile if the destination type is long enough. Find centralized, trusted content and collaborate around the technologies you use most. You think by casting it here that you are avoiding the problem! And, most of these will not even work on gcc4. Where does this (supposedly) Gibson quote come from? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ rev2023.3.3.43278. Is it possible to create a concave light? this way you won't get any warning. converted back to pointer to void, and the result will compare equal The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. byte -> short -> char -> int -> long -> float -> double. ^~~~~~~~~~~~~~~~~~~~~ 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. The int data type is the primary integer data type in SQL Server. 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. I need to cast the int from the first function so that I can use it as an argument for the second function. So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. How to notate a grace note at the start of a bar with lilypond? Click to see the query in the CodeQL repository. On all of them int is 32bit, not 16bit.
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