This is what the second warning is telling you. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw Asking for help, clarification, or responding to other answers. Notifications. 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. Actions. ../lib/odp-util.c:5603:13: note: expanded from macro 'SCAN_PUT' Connect and share knowledge within a single location that is structured and easy to search. If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. Can I tell police to wait and call a lawyer when served with a search warrant? Fork 63. Connect and share knowledge within a single location that is structured and easy to search. (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. Then i can continue compiling. : iPhone Retina 4-inch 64-bit) is selected. How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. But this code pass the normal variable .. Yeah, the tutorial is doing it wrong. rev2023.3.3.43278. You can use a 64 bits integer instead howerver I usually use a function with the right prototype and I cast the function type : As was pointed out by Martin, this presumes that sizeof(void*)>=sizeof(int). Why does Mister Mxyzptlk need to have a weakness in the comics? There is no "correct" way to store a 64-bit pointer in an 32-bit integer. 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]. 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. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? How to notate a grace note at the start of a bar with lilypond? 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You should be doing int x = *((int *)arg); You are casting from void * to int that is why you get the warning. to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, "what happen when typcating normal variable to void* or any pointer variable?" For example, if you want to store a 'long' value into a simple integer then you can type cast 'long' to 'int'. @kshegunov said in Number Type Cast: const void * x; int y = int (x); compiles just fine. Error while setting app icon and launch image in xcode 5.1. How Intuit democratizes AI development across teams through reusability. B programing language is a language based on basic combined programming or a BCPL, and it is the precursor of the C programming language. However, you are also casting the result of this operation to (void*). This is memory reinterpretation - a completely unacceptable way to do what the OP is trying to do. warning C4311: 'type cast': pointer truncation from 'void *' to 'long' in ECPG test files. Find centralized, trusted content and collaborate around the technologies you use most. How do I align things in the following tabular environment? 1. (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 10.3k 2 21 2015-06-05 By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. A cast specifies a conversion from one type to another. But gcc always give me a warning, that i cannot cast an int to a void*. In my case, I was using a 32-bit value that needed to be passed to an OpenGL function as a void * representing an offset into a buffer. Java Type Casting. @Martin York: No, it doesn't depend on endiannness. A nit: in your version, the cast to void * is unnecessary. Disconnect between goals and daily tasksIs it me, or the industry? Terrible solution. This is not even remotely "the correct answer". Sign in what does it mean to convert int to void* or vice versa? I don't see how anything bad can happen . 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. You should perform type conversion based on 64bit build system because the type "int" supports only -32768 ~ 32768. 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. This will only compile if the destination type is long enough. If you do this, you have the thread reference a value that (hopefully still) lives in some other thread. No sense in writing a few dozen lines of extra code just to get a bunch of numbered threads. The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. 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. Find centralized, trusted content and collaborate around the technologies you use most. rev2023.3.3.43278. } SCAN_END_SINGLE(ATTR) Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). We have to pass address of the variable to the function because in function definition argument is pointer variable. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. what does it mean to convert int to void* or vice versa? As a result of the integer division 3/2 we get the value 1, which is of the int type. It is easier to understand and write than any other assembly language. If the destination type is bool, this is a boolean conversion (see below). Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Just edited. Functions return bigint only if the parameter expression is a bigint data type. To cast such pointers to 32-bit types and vice versa special functions are used: void * Handle64ToHandle ( const void * POINTER_64 h ) void * POINTER_64 HandleToHandle64 ( const void *h ) long HandleToLong ( const void *h ) unsigned long HandleToUlong ( const void *h ) Any help with this is appreciated. GitHub Skip to content Product Solutions Open Source Pricing Sign in Sign up smadaminov / ovs-dpdk-meson-issues Public Notifications Fork 1 Star 1 Code Issues 66 Pull requests Actions Projects 1 Security Insights New issue Asking for help, clarification, or responding to other answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Since the 'size' argument for your function is the number of bytes each element in the array needs, I think casting the pointerto (char*) is appropriate. Maybe you can try this too. Here is my code: I already tried (void*)M_TABLE_SIZE but then I get an error that I cannot use the * operator. (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. Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul "After the incident", I started to be more careful not to trip over things. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I cannot reverse my upvote of user384706's answer, but it's wrong. The problem was there before, you just are being notified of it. Typically, long or unsigned long is . The high-order 9 bits of the number are used to hold a flag value, and the result is converted back into a pointer. The compiler issues the "cast from integer to pointer of different size" warning whenever the value of an integer is converted to a pointer, especially when the memory allocated to a pointer is smaller than the memory allocated to an integer data type. Put your define inside a bracket: #define M_TABLE_SIZE (64*1024) Now, you can do: static const void* M_OFFSET = (void*) M_TABLE_SIZE; without a problem. In the case of Widening Type Casting, the lower data type (having smaller size) is converted into the higher data type (having larger size). 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. Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. Use returnPtr[j] = (void *) ((long)ptr + i); ). 7.1 New Cast Operations The C++ standard defines new cast operations that provide finer control than previous cast operations. You can only do this if you use a synchronization primitive to ensure that there is no race condition. I need to cast the int from the first function so that I can use it as an argument for the second function. Don't do that. If int is no larger than pointer to void then one way to store the value is by simply copying the bytes: int i . equal to the original pointer: First you are using a define, which is not a variable. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Making statements based on opinion; back them up with references or personal experience. @LearnCocos2D: so, how can i "overcome" the error without editing any not-my-code or in-library-file lines? And when assigning to a void pointer, all type information is lost. Infact I know several systems where that does not hold. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide.

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