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cast to void *' from smaller integer type 'int

C99 standard library provides intptr_t and uintptr_t typedefs, which are supposed to be used whenever the need to perform such a cast comes about. Not the answer you're looking for? I am compiling this program in linux gcc compiler.. B language was designed to develop . To learn more, see our tips on writing great answers. @jackdoe: It's a waste of human life to write code that "you may need in the future". 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" (. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? So,solution #3 works just fine. GitHub. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Find centralized, trusted content and collaborate around the technologies you use most. In the first example, the variable c1 of the char type is converted to a temporary variable of the int type, because the second operand in the division operation, the constant 2, is of the higher type int. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? There's no proper way to cast this to int in general case. To learn more, see our tips on writing great answers. Identify those arcade games from a 1983 Brazilian music video. Example: int x=7, y=5; float z; z=x/y; /*Here the value of z is 1*/. What I am saying is that it would be safer to use new(5) rather than 5 and deal with it appropriately at the other end. Losing bytes like thisis called 'truncation', and that's what the first warning is telling you. So make sure you understand what you are doing! Where does this (supposedly) Gibson quote come from? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If the value in a pointer is cast to a different type and it does not have the correct alignment for the new type, the behavior is undefined. ^~~~~~~~~~~~~~~~~~~~~ What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. Connect and share knowledge within a single location that is structured and easy to search. How do I check if a string represents a number (float or int)? // OK: lvalue denoting the original d object, // UB: the b subobject is not a base class subobject, // 6. array-to-pointer followed by upcast, https://en.cppreference.com/mwiki/index.php?title=cpp/language/static_cast&oldid=147983, when converting a 'pointer to object' to 'pointer to, the conversion from floating-point values, the conversion from bit-fields to rvalue references, the conversion from integral or enumeration values to enumeration, the conversion from integral or enumeration values to, the conversion from a member of base class type to, a standard-layout class object with no data members, a non-standard-layout union object and a non-static data, for base-to-derived pointer conversions and, the conversion to enumeration types with fixed underlying type, a standard-layout class might have a non-pointer-interconvertible, If the underlying type is not fixed, the behavior is undefined if the value of, If the underlying type is fixed, the result is the same as, one is a union object and the other is a non-static data member of that object, or. ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' Apparently the clang version in Xcode 5.1 and above is more strict about potential 32bit vs. 64 bit incompatibilities in source code than older clang versions have been. B Programming Language | What is the History and Concept? Find centralized, trusted content and collaborate around the technologies you use most. Asking for help, clarification, or responding to other answers. It is commonly called a pointer to T and its type is T*. In this case, casting the pointer back to an integer is meaningless, because . ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ How Intuit democratizes AI development across teams through reusability. 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. 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! SCAN_PUT_ATTR(key, ATTR, skey, FUNC); Type casting is when you assign a value of one primitive data type to another type. If that happens soon after the call to pthread_create() then you have a race condition, because there's a chance that the thread will attempt to read x's value after it's life has ended, which invokes undefined behavior. All character types are to be converted to an integer. So you know you can cast it back like this. How to use Slater Type Orbitals as a basis functions in matrix method correctly? 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 Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. vegan) just to try it, does this inconvenience the caterers and staff? long guarantees a pointer size on Linux on any machine. Making statements based on opinion; back them up with references or personal experience. 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" Bulk update symbol size units from mm to map units in rule-based symbology. [Solved] Error "Cast from pointer to smaller type 'int' | 9to5Answer INT31-C. Ensure that integer conversions do not result in lost or The high-order 9 bits of the number are used to hold a flag value, and the result is converted back into a pointer. Why does Mister Mxyzptlk need to have a weakness in the comics? Taking the above declarations of A, D, ch of the . linux c-pthreads: problem with local variables. (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. Thanks for contributing an answer to Stack Overflow! If not, check the pointer size on your platform, define these typedefs accordingly yourself and use them. The correct answer is, if one does not mind losing data precision. lexborisov Modest Public. ../lib/odp-util.c:5489:33: note: expanded from macro 'SCAN_PUT_ATTR' Fix for objc/45925 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. 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: ids [i] = (int) (size_t)touch; 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". Casting int to void* loses precision, and what is the solution in required cases, c++: cast from "const variable*" to "uint32" loses precision, Recovering from a blunder I made while emailing a professor, Relation between transaction data and transaction id. If the sizes are different then endianess comes into play. 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. Converting a void* to an int is non-portable way that may work or may not! So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. If you preorder a special airline meal (e.g. The problem was there before, you just are being notified of it. 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. Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). How to correctly type cast (void*)? - social.msdn.microsoft.com How to make compiler not show int to void pointer cast warnings, incompatible pointer types assigning to 'void (*)(void *)' from 'int (int *)'. eg. Does a summoned creature play immediately after being summoned by a ready action? This page was last modified on 12 February 2023, at 18:25. You need to pass an actual pointer. Replacing broken pins/legs on a DIP IC package, How to handle a hobby that makes income in US. How to correctly cast a pointer to int in a 64-bit application? 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 . casting from int to void* and back to int. Yeah, the tutorial is doing it wrong. then converted back to pointer to void, and the result will compare For example, if youwrite ((int*)ptr + 1), it will add 4 bytes to the pointer, because "ints" are 4 bytes each. I guess the other important fact is that the cast operator has higher precedence that the multiplication operator. reinterpret_cast is a type of casting operator used in C++. The bigint data type is intended for use when integer values might exceed the range that is supported by the int data type.. bigint fits between smallmoney and int in the data type precedence chart.. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I don't see how anything bad can happen . Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. [PATCH] platform/x86: hp-wmi: Fix cast to smaller integer type warning Why is there a voltage on my HDMI and coaxial cables? How to use Slater Type Orbitals as a basis functions in matrix method correctly? The preprocesor absolutely will not perform arithmetic. I would create a structure and pass that as void* to pthread_create. Can we typecast void into int? - Quora 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. This is known as implicit type casting or type promotion, compiler automatically converts smaller data type to larger data type. - the incident has nothing to do with me; can I use this this way? Use #include to define it. BUT converting a pointer to void* and back again is well supported (everywhere). ^~~~~~~~~~~~~~~~~~~~ Identify those arcade games from a 1983 Brazilian music video, Relation between transaction data and transaction id, The difference between the phonemes /p/ and /b/ in Japanese. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. And in this context, it is very very very common to see programmers lazily type cast the. Thanks for contributing an answer to Stack Overflow! rev2023.3.3.43278. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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. Visit Microsoft Q&A to post new questions. Find centralized, trusted content and collaborate around the technologies you use most. Keep in mind that thrArg should exist till the myFcn() uses it. 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. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. Mutually exclusive execution using std::atomic? Note the difference between the type casting of a variable and type casting of a pointer. error: cast from 'void*' to 'int' loses precision - Stack Overflow If you need to keep the returned address, just keep it as void*. (int) pthread_self() 64int48intuintptr_t (unsigned int) Implementation-dependent. Implicit Type Conversion is also known as 'automatic type conversion'. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This method will not work on 64 bit Big Endian platform, so it unnecessarily breaks portability. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. whether it was an actual problem is a different matter though. STR34-C. Cast characters to unsigned char before converting to larger p-util.c.obj "-c" ../lib/odp-util.c I wish that you write those answer first than the explanation. Press question mark to learn the rest of the keyboard shortcuts. What is the correct method to cast an int to a void*? with ids being an array of ints and touch being a pointer. RNINGS" "-D_CRT_SECURE_NO_DEPRECATE" -MD -MQ lib/libopenvswitch.a.p/odp-util.c.obj -MF "lib\libopenvswitch.a.p\odp-util.c.obj.d" -o lib/libopenvswitch.a.p/od You could use this code, and it would do the same thing as casting ptr to (char*). Hence there is no loss in data. @Xax: Here's a fixed version, without the race condition: gist.github.com/depp/241d6f839b799042c409, gist.github.com/depp/3f04508a88a114734195, How Intuit democratizes AI development across teams through reusability. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Offline ImPer Westermark over 11 years ago in reply to Andy Neil Except that you sometimes stores an integer in the pointer itself. The calculated expression consists of two operations. rev2023.3.3.43278. rev2023.3.3.43278. [] ExplanatioUnlike static_cast, but like const_cast, the reinterpret_cast expression does not compile to any CPU instructions (except when converting between integers and pointers or on obscure architectures where pointer representation depends on its type). Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? a cast of which the programmer should be aware of what (s)he is doing. Is a PhD visitor considered as a visiting scholar. How to notate a grace note at the start of a bar with lilypond? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. This page has been accessed 1,655,678 times. Based on the design of this function, which modification is right. windows meson: cast to 'HANDLE' (aka 'void *') from smaller integer ncdu: What's going on with this second size column? Well it does this because you are converting a 64 bits pointer to an 32 bits integer so you loose information. To avoid truncating your pointer, cast it to a type of identical size. There are ways to prevent this: pass a dynamic allocated argument if your not the passing thread is not static or if your argument is a local variable, otherwise there is no issue. Java Type Casting (With Examples) - Programiz There's probably little you can do except look or hope for a fixed 2.x version or upgrade to 3.x (I would assume it's 64-bit safe but this is just a guess, do research this issue before you upgrade). Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. Half your pointer will be garbage. converted back to pointer to void, and the result will compare equal 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. */ >> -bool >> +enum conversion_safety >> unsafe_conversion_p (tree type, tree expr, bool . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The only alternative is really to take time and fix all 64-bit code issues, of which there may be some non-trivial issues. Types - D Programming Language ", "!"? Put your define inside a bracket: without a problem. What is the point of Thrower's Bandolier? I recall there was a TreeNode(int) early on prior to 1.0 release I can't remember why I removed it, if I should felt it was easy enough to cast to (void*) or if it was because it created type inference conflict at the call site. To perform a cast, specify the type that you are casting to in parentheses in front of the value or variable to be converted. 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 "clang" "-Ilib\libopenvswitch.a.p" "-Ilib" "-I..\lib" "-I." LLNL's tutorial is bad and they should feel bad. Type Casting Of Pointers in C - Computer Notes 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. Thanks for pointing that out. this way I convert an int to a void* which is much better than converting a void* to an int. Number Type Cast | Qt Forum ), Styling contours by colour and by line thickness in QGIS. It modifies >> Wconversion-real.c, Wconversion-real-integer.c and pr35635.c to be more >> specific > > If the patch passes existing tests, I'd be inclined to leave them > tests alone and add new ones that are specific to what this patch > changes. 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. Linear regulator thermal information missing in datasheet. If you call your thread creation function like this, then the void* arriving inside of myFcn has the value of the int you put into it. There is no "correct" way to store a 64-bit pointer in an 32-bit integer. Windows has 32 bit long only on 64 bit as well. I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread. SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); This is what the second warning is telling you. I usually have all automatic conversion warnings effective when developing in C, and I use explicit casting in order to suppress a specific . You are getting warnings due to casting a void* to a type of a different size. To access the object value, use the * dereference operator: int * p; assert (p == null ); p = new int (5); assert (p != null ); assert (*p == 5); (*p)++; assert (*p == 6); If a pointer contains a null value, it is not pointing to a valid object. For example, the main thread could wait for all of the other threads to end before terminating. Do new devs get fired if they can't solve a certain bug? Terrible solution. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. An object pointer (including void*) or function pointer can be converted to an integer type using reinterpret_cast. Is it possible to create a concave light? Casting type int to const void* - C / C++ This is not even remotely "the correct answer". Using Kolmogorov complexity to measure difficulty of problems? In the case of Widening Type Casting, the lower data type (having smaller size) is converted into the higher data type (having larger size). ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' Again, all of the answers above missed the point badly. This is flat out wrong. 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. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Pull requests. You are just making it bigger by tricking the compiler and the ABI. The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. A void pointer can be really useful if the programmer is not sure about the data type of data inputted by the end user. My code is all over the place now but I appreciate you all helping me on my journey to mastery! Disconnect between goals and daily tasksIs it me, or the industry? I'm using cocos2d-x-2.2.2. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? What is the point of Thrower's Bandolier? You may declare a const int variable and cast its reference to the void*. Instead of using a long cast, you should cast to size_t. 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]. It is done by the compiler on its own, without any external trigger from the user. Since all pointers on 64-bit Windows are 64 bits, you are growing the data size from 32 bits backto 64 bits.

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