Maybe you can try this too. Api says this is how i should create thread: So if I want to pass an int what I think I should do is: The second example assumes that a pointer is wide enough to store an int. The text was updated successfully, but these errors were encountered: You signed in with another tab or window. How to use Slater Type Orbitals as a basis functions in matrix method correctly? It is purely a compile-time directive which instructs the compiler to treat expression as if it had . And then assign it to the double variable. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. The mapping in pointer<->integer casts is implementation defined, but the intent was that if the pointer type is large enough and isn't forcefully aligned (, But that's different. 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 would create a structure and pass that as void* to pthread_create. How do I force make/GCC to show me the commands? As was pointed out by Martin, this presumes that sizeof(void*)>=sizeof(int). *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 . From that point on, you are dealing with 32 bits. Whats the grammar of "For those whose stories they are"? Click to see the query in the CodeQL repository. Losing bytes like thisis called 'truncation', and that's what the first warning is telling you. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw 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 point of Thrower's Bandolier? Usually that means the pointer is allocated with. 10) A prvalue of type pointer to void (possibly cv-qualified) can be converted to pointer to any object type. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? 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. Mutually exclusive execution using std::atomic? you can just change architecture to support 32 bit compilation by all below in in Build Settings. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? There's no proper way to cast this to int in general case. The correct answer is, if one does not mind losing data precision. Sign in and how to print the thread id of 2d array argument? What video game is Charlie playing in Poker Face S01E07? If you preorder a special airline meal (e.g. @DietrichEpp can you explain what is race condition with using. Can Martian regolith be easily melted with microwaves? what happens when we typecast normal variable to void* or any pointer variable? vegan) just to try it, does this inconvenience the caterers and staff? This will only compile if the destination type is long enough. 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. Converting a pointer to an integer whose result cannot represented in the integer type is undefined behavior is C and prohibited in C++. And, most of these will not even work on gcc4. 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. 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. LLNL's tutorial is bad and they should feel bad. (int) pthread_self() 64int48intuintptr_t (unsigned int) rev2023.3.3.43278. GitHub. 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. Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul 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). How to notate a grace note at the start of a bar with lilypond? The text was updated successfully, but these errors were encountered: how to cascade 2d int array to 2d void pointer array? This is an old C callback mechanism so you can't change that. ../lib/odp-util.c:5489:33: note: expanded from macro 'SCAN_PUT_ATTR' Half your pointer will be garbage. 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. long guarantees a pointer size on Linux on any machine. Find centralized, trusted content and collaborate around the technologies you use most. It is done by the compiler on its own, without any external trigger from the user. Find centralized, trusted content and collaborate around the technologies you use most. Now, what happens when I run it with the thread sanitizer? Already on GitHub? This page was last modified on 12 February 2023, at 18:25. even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. Infact I know several systems where that does not hold. All float types are to be converted to double. ^~~~~~~~~~~~~~~~~~~~ Thanks for contributing an answer to Stack Overflow! itch" "-I..\include\windows" "-Iinclude" "-I..\include" "-I..\datapath-windows\include" "-IC:\PTHREADS-BUILT\include" "-Xclang" "-fcolor-diagnostics" "-pipe" You can convert the values from one type to another explicitly using the cast operator as follows (type_name) expression this question. "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. 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: I am using size_t here, because it is always having the same size as a pointer, no matter the platform. Actions. Bulk update symbol size units from mm to map units in rule-based symbology. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? ^~~~~~~~~~~~~~~~~~~~~ A pointer converted to an integer of sufficient size and back to the same pointer type is guaranteed to have its original value, otherwise the resulting pointer cannot be dereferenced safely ( the round-trip conversion in the opposite direction is not guaranteed [.]) It is easier to understand and write than any other assembly language. 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 ) If the original type is a void *, converting to an int may lose date on platforms where sizeof(void *) != sizeof(int) (which is true of LP64 programming model). reinterpret_cast<void *>(42)). Asking for help, clarification, or responding to other answers. If not, check the pointer size on your platform, define these typedefs accordingly yourself and use them. Fork 63. If your standard library (even if it is not C99) happens to provide these types - use them. If the sizes are different then endianess comes into play. Making statements based on opinion; back them up with references or personal experience. Have a question about this project? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. But assuming that it is, as long as the caller and the callee agree, you can do that sort of thing. Since all pointers on 64-bit Windows are 64 bits, you are growing the data size from 32 bits backto 64 bits. "I think what you should do is actually pass the address of the variable to the function" Not necessarily. Or, they are all wrong. What you do here is undefined behavior, and undefined behavior of very practical sort. C++ how to get the address stored in a void pointer? The difference between a and &a is the type. then converted back to pointer to void, and the result will compare There's no proper way to cast this to int in general case. How can this new ban on drag possibly be considered constitutional? Does melting sea ices rises global sea level? 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 Java, there are two types of casting: Widening Casting (automatically) - converting a smaller type to a larger type size. 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)). This is not even remotely "the correct answer". The preprocesor absolutely will not perform arithmetic. For the remaining integral types, the result is the value of the enum if it can be represented by the target type and unspecified otherwise. However even though their types are different, the address is going to be the same. privacy statement. 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). ", "!"? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By clicking Sign up for GitHub, you agree to our terms of service and */ >> -bool >> +enum conversion_safety >> unsafe_conversion_p (tree type, tree expr, bool . The dynamic_cast<>operator provides a way to check the actual type of a pointer to a polymorphic class. If the destination type is bool, this is a boolean conversion (see below). As for the stack, I've written a few libraries using pthreds, thus I don't agree that what you describe "is quite often the case". Put your define inside a bracket: without a problem. Is a PhD visitor considered as a visiting scholar. Making statements based on opinion; back them up with references or personal experience. Since gcc compiles that you are performing arithmetic between void* and an int (1024). The best way is, if one can, do not do such casting, instead, if the same memory address has to be shared for pointer and int (e.g. Thanks Jonathan, I was thinking about my answer in another thread: AraK is correct, passing integers a pointers are not necessarily interchangeable. return ((void **) returnPtr);} /* Matrix() */. 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. 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 By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); Where does this (supposedly) Gibson quote come from? BUT converting a pointer to void* and back again is well supported (everywhere). You are getting warnings due to casting a void* to a type of a different size. Properly casting a `void*` to an integer in C++ 24,193 Solution 1 I think using intptr_t is the correct intermediate here, since it's guaranteed to be large enough to contain the integral value of the void*, and once I have an integer value I can then truncate it without causing the compiler to complain. Find centralized, trusted content and collaborate around the technologies you use most. Once you manage to make this cast, then what?! 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! Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. Why do academics stay as adjuncts for years rather than move around? (void *)i Error: cast to 'void *' from smaller integer type 'int'. Just want to point out that the purpose of threads is, +1 absolutely true, but if you take you time to write struct {}, you can save a lot of troubles in the future when you want to receive/send more data then just an int. This forum has migrated to Microsoft Q&A. Hence there is no loss in data. A nit: in your version, the cast to void * is unnecessary. Recovering from a blunder I made while emailing a professor. Typically, long or unsigned long is . Does Counterspell prevent from any further spells being cast on a given turn? Does a summoned creature play immediately after being summoned by a ready action? My code is all over the place now but I appreciate you all helping me on my journey to mastery! For example, the main thread could wait for all of the other threads to end before terminating. eg. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? Don't do that. From the question I presume the OP does. If you are going to pass the address you typically need to exert some more control over the lifetime of the object. Use #include