This is not a conversion at all. I need to cast the int from the first function so that I can use it as an argument for the second function. use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD). Have a question about this project? Terrible solution. "-D_FILE_OFFSET_BITS=64" "-Wall" "-Winvalid-pch" "-g" "-Wthread-safety" "-Wno-microsoft-enum-forward-reference" "-Wno-unused-function" "-Wno-sometimes-unini What does casting to void* does when passing arguments to variadic functions? How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. this way you won't get any warning. What is the point of Thrower's Bandolier? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I'm new to coding and am trying to implement a simple program on my own, that prompts the user the number of residents in an apt complex, the prompts the user to enter the names and apt numbers of each resident. ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' Example: int x=7, y=5; float z; z=x/y; /*Here the value of z is 1*/. Making statements based on opinion; back them up with references or personal experience. This is why you got Error 1 C2036, from your post. I'm unfamiliar with XCode, but the solution should be something like follows: Most of the "solutions" above can lose part of the pointer address when casting to a smaller type. What is the difference between const int*, const int * const, and int const *? (int) pthread_self() 64int48intuintptr_t (unsigned int) If this is the data to a thread procedure, then you quite commonly want to pass by value. In Java, there are two types of casting: Widening Casting (automatically) - converting a smaller type to a larger type size. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Converting a pointer to an integer whose result cannot represented in the integer type is undefined behavior is C and prohibited in C++. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? All character types are to be converted to an integer. Netdev Archive on lore.kernel.org help / color / mirror / Atom feed * [mst-vhost:vhost 5/52] drivers/block/virtio_blk.c:539:21: warning: assignment to 'void *' from . For example, if you want to store a 'long' value into a simple integer then you can type cast 'long' to 'int'. Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Are there tables of wastage rates for different fruit and veg? What I am trying to emphasis that conversion from int to pointer and back again can be frough with problems as you move from platform to platform. To avoid truncating your pointer, cast it to a type of identical size. 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. STR34-C. Notifications. The calculated expression consists of two operations. If the object expression refers or points to is actually a base class subobject of an object of type D, the result refers to the enclosing object of type D. Otherwise, the behavior is undefined: When the target type is bool (possibly cv-qualified), the result is false if the original value is zero and true for all other values. Well occasionally send you account related emails. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is this sentence from The Great Gatsby grammatical? Why is there a voltage on my HDMI and coaxial cables? This allows you to reinterpret the void * as an int. Instead of using a long cast, you should cast to size_t. If the sizes are different then endianess comes into play. But assuming that it is, as long as the caller and the callee agree, you can do that sort of thing. A missing cast in the new fast > enumeration code. 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. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? If your standard library (even if it is not C99) happens to provide these types - use them. B programing language is a language based on basic combined programming or a BCPL, and it is the precursor of the C programming language. If the function had the correct signature you would not need to cast it explicitly. There is absolutely not gurantee that sizeof(int) <= sizeof(void*). Just re-enforcing the old behavior of Xcode 5.0 and earlier versions, that already cut away parts of the address by casting it to int, won't introduce any new bugs and avoids the need to learn and understand lots of implementation-internal cocos code. Losing bytes like thisis called 'truncation', and that's what the first warning is telling you. The cast back to int * is not, though. Cast characters to unsigned char before converting to larger integer sizes Created by Robert Seacord, last modified by Jill Britton on Oct 03, 2022 Signed character data must be converted to unsigned char before being assigned or converted to a larger signed type. 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. What is the purpose of non-series Shimano components? @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. There is no "correct" way to store a 64-bit pointer in an 32-bit integer. Floating-point conversions 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. 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; for (i=0, j=0; j should be the correct one. ncdu: What's going on with this second size column? @DavidHeffernan I rephrased that sentence a little. Where does this (supposedly) Gibson quote come from? To be honest, I think, clang is too restrictive here. You could use this code, and it would do the same thing as casting ptr to (char*). The only alternative is really to take time and fix all 64-bit code issues, of which there may be some non-trivial issues. vegan) just to try it, does this inconvenience the caterers and staff? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Casting a pointer to void* and back is valid use of reinterpret_cast<>. ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' @Martin York: No, it doesn't depend on endiannness. This solution is in accordance with INT18-C. Such pointers can be stored in 32-bit data types (for instance, int, DWORD). Here is some piece of code where that error occur: /cocos2d-x-2.2.2/cocos2dx/platform/ios/EAGLView.mm:408:18: Cast from pointer to smaller type 'int' loses information. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? 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. The main point is: a pointer has a platform dependent size. Identify those arcade games from a 1983 Brazilian music video. 1. What is the correct method to cast an int to a void*? 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. Such a downcast makes no runtime checks to ensure that the object's runtime type is actually D, and may only be used safely if this precondition is guaranteed by other means, such as when implementing static polymorphism. You are right! The 32 remaining bits stored inside int are insufficient to reconstruct a pointer to the thread function. And you can't pass a pointer to a stack based object from the other thread as it may no longer be valid. The problem was there before, you just are being notified of it. Thanks for pointing that out. But the problem has still happened. 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 you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte.