@Martin York: No, it doesn't depend on endiannness. What is this brick with a round back and a stud on the side used for? 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. To learn more, see our tips on writing great answers. 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! Posted on Author Author 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. Which ability is most related to insanity: Wisdom, Charisma, Constitution, or Intelligence? @BlueMoon Thanks a lot! The most general answer is - in no way. There's no proper way to cast this to int in general case. ", "!"? From: Hans de Goede <hdegoede@redhat.com> To: Mark Gross <mgross@linux.intel.com> Cc: Hans de Goede <hdegoede@redhat.com>, Andy Shevchenko <andy@infradead.org>, platform-driver-x86@vger.kernel.org, kernel test robot <lkp@intel.com> Subject: [PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning Date: Mon, 23 Jan 2023 14:28:24 +0100 [thread overview] Message-ID: <20230123132824. . In C#, you can perform the following kinds of conversions: Implicit conversions: No special syntax is required because the conversion always succeeds and no data will be lost. You use the address-of operator & to do that. For more information, see How to safely cast using pattern matching and the as and is operators. Say you hack this successfully. The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. For example, if the pointers in a system are stored in 16 bits, but integers are stored in 8 bits, a total of 8 bits would be lost in the . (void *)i Error: cast to 'void *' from smaller integer type 'int' PS: UBUNTUCLANG3.5 clang -O0 -std=gnu11 -march=native -lm -lpthread pagerank.c -o pagerank c pthreads 4 10.8k 2 21 2015-06-05 Why does Acts not mention the deaths of Peter and Paul? From the question I presume the OP does. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? casting from int to void* and back to int. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. How do I count the number of sentences in C using ". And in this context, it is very very very common to see programmers lazily type cast the. MIP Model with relaxed integer constraints takes longer to solve than normal model, why? How to force Unity Editor/TestRunner to run at full speed when in background? The next Access Europe Meeting is on Wed 3 May 2023. You use the address-of operator & to do that int x = 10; void *pointer = &x; And in the function you get the value of the pointer by using the dereference operator *: int y = * ( (int *) pointer); Share Improve this answer Follow edited Apr 15, 2013 at 13:58 answered Apr 15, 2013 at 13:53 Some programmer dude 396k 35 399 609 1 User without create permission can create a custom object from Managed package using Custom Rest API. Visit Microsoft Q&A to post new questions. Explanation Only the following conversions can be done with static_cast, except when such conversions would cast away constness or volatility . to the original pointer: The following type designates an unsigned integer type with the A. if(x%2=1)y=x;B. if(sqrt(x)%2)y=x;C. if(x==1)y=x;D. if(x==1)y=&x; Cerror: cast to 'void *' from smaller integer type 'int'. Casting arguments inside the function is a lot safer. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Casting int to void* : r/C_Programming - Reddit Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? 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). I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread. One could try -fms-extensions (hopefully not -fms-compatibility), but that would bring all the shebang with it. Most answers just try to extract 32 useless bits out of the argument. Converting a void* to an int is non-portable way that may work or may not! #, In a 64 bit machine with sizeof(int) == 4. This will get you a pointer from a 32 bit offset: A function pointer is incompatible to void* (and any other non function pointer). Remembering to delete the pointer after use so that we don't leak. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Once you manage to make this cast, then what?! @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. Windows has 32 bit long only on 64 bit as well. Connect and share knowledge within a single location that is structured and easy to search. I am using the UDF of the Ansys Manual Book as a base for what I intended, but I am trying to incorporate a second component to my condensable mixture, being methanol . What is the difference between const int*, const int * const, and int const *? Find centralized, trusted content and collaborate around the technologies you use most. Making statements based on opinion; back them up with references or personal experience. If this is the data to a thread procedure, then you quite commonly want to pass by value. Why don't we use the 7805 for car phone chargers? 4. Type Conversions - C in a Nutshell [Book] - O'Reilly Online Learning rev2023.5.1.43405. Not the answer you're looking for? You might want to typedef, You should change your code to handle this. Can anybody explain how to pass an integer to a function which receives (void * ) as a parameter? u32 -> u8) will truncate Casting from a smaller integer to a larger integer (e.g. Both languages have been widely adopted by How to plot text in color? That's not a good idea if the original object (that was cast to void*) was an integer. Why does setupterm terminate the program? More info about Internet Explorer and Microsoft Edge, How to convert between hexadecimal strings and numeric types, How to safely cast using pattern matching and the as and is operators. If your code has the chance to ever be ported to some platform where this doesn't hold, this won't work. 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. Did the drapes in old theatres actually say "ASBESTOS" on them? BUT converting a pointer to void* and back again is well supported (everywhere). Casting is required when information might be lost in the conversion, or when the conversion might not succeed for other reasons. void *ptr; int n = (int)ptr; So in c++ i tried below int n = atoi (static_cast<const char*> (ptr)); This crashes when i run. In the following example, the compiler implicitly converts the value of num on the right to a type long before assigning it to bigNum. Is a downhill scooter lighter than a downhill MTB with same performance? eg. Note that it's not guaranteed that casting an, Generally this kind of type casting does not lead to any concern as long as the addresses are encoded using the same length as the "variable type" (. Asking for help, clarification, or responding to other answers. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. following block Hello, It is commonly called a pointer to T and its type is T*. If int is no larger than pointer to void then one way to store the value is by simply copying the bytes: int i . OP said he doesn't want it. If you do this, you have the thread reference a value that (hopefully still) lives in some other thread. For example, assigning an int value to a long variable. Should I re-do this cinched PEX connection? Does it effect my blogs SEO rankings? Why does flowing off the end of a non-void function without returning a value not produce a compiler error? Is "I didn't think it was serious" usually a good defence against "duty to rescue"? Why is it shorter than a normal address? Type conversions - cplusplus.com this question. It seems both static_cast and dynamic_cast can cast a base class The main point is: a pointer has a platform dependent size. I had this error while trying to cross compile the
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