cast to void *' from smaller integer type 'int cast to void *' from smaller integer type 'int

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. GitHub. Fork 63. SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? In such a case the programmer can use a void pointer to point to the location of the unknown data type. Hence there is no loss in data. ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' Put your define inside a bracket: without a problem. There is absolutely not gurantee that sizeof(int) <= sizeof(void*). privacy statement. To learn more, see our tips on writing great answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Connect and share knowledge within a single location that is structured and easy to search. In 64-bit programs, the size of the pointer is 64 bits, and cannot be put into the int type, which remains 32-bit in almost all systems. 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; Thanks. Is it possible to create a concave light? Create an account to follow your favorite communities and start taking part in conversations. [] 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). I cannot reverse my upvote of user384706's answer, but it's wrong. For example, the main thread could wait for all of the other threads to end before terminating. Asking for help, clarification, or responding to other answers. [that could be a TODO - not to delay solving the ICE]. 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). 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. Why is there a voltage on my HDMI and coaxial cables? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Using indicator constraint with two variables. What video game is Charlie playing in Poker Face S01E07? However, I believe that even if the define was for the "65536", it would not be what @kaetzacoatl wanted. lexborisov Modest Public. Converts between types using a combination of implicit and user-defined conversions. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Can Martian regolith be easily melted with microwaves? 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 [.]) 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. How to correctly cast a pointer to int in a 64-bit application? All character types are to be converted to an integer. Connect and share knowledge within a single location that is structured and easy to search. *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 . ), For those who are interested. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. If your code has the chance to ever be ported to some platform where this doesn't hold, this won't work. But I'm nitpicking .. No sense in writing a few dozen lines of extra code just to get a bunch of numbered threads. SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); 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. Converting a void* to an int is non-portable way that may work or may not! tialized" "-Wno-format" "-Wno-incompatible-pointer-types" "-Werror" "-dM" "-U_MSC_VER" "-D_TIMESPEC_DEFINED" "-D_CRT_NONSTDC_NO_DEPRECATE -D_CRT_SECURE_NO_WA Acidity of alcohols and basicity of amines. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. There exist two main syntaxes for generic type-casting: functional and c-like: 1 2 3 4 double x = 10.3; int y; y = int (x); // functional notation y = (int) x; // c-like cast notation The functionality of these generic forms of type-casting is enough for most needs with fundamental data types. The main point is: a pointer has a platform dependent size. I guess the other important fact is that the cast operator has higher precedence that the multiplication operator. So, when you cast a (void*) to (long), you are losing 32 bits of data in the conversion. 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. Why do academics stay as adjuncts for years rather than move around? Why does Mister Mxyzptlk need to have a weakness in the comics? Disconnect between goals and daily tasksIs it me, or the industry? @DavidHeffernan I rephrased that sentence a little. rev2023.3.3.43278. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? 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. This will only compile if the destination type is long enough. C99 defines the types "intptr_t" and "uintptr_t" which do . Therefore, you need to change it to long long instead of long in windows for 64 bits. what happens when we typecast normal variable to void* or any pointer variable? BUT converting a pointer to void* and back again is well supported (everywhere). If your standard library (even if it is not C99) happens to provide these types - use them. 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. This example is noncompliant on an implementation where pointers are 64 bits and unsigned integers are 32 bits because the result of converting the 64-bit ptr cannot be represented in the 32-bit integer type. If your standard library (even if it is not C99) happens to provide these types - use them. 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. 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 can pass the int value as void pointer like (void *)&n where n is integer, and in the function accept void pointer as parameter like void foo (void *n); and finally inside the function convert void pointer to int like, int num = * (int *)n;. Sign in Bulk update symbol size units from mm to map units in rule-based symbology. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? 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.. Any help with this is appreciated. Please help me compile Chez Scheme. Connect and share knowledge within a single location that is structured and easy to search. The only alternative is really to take time and fix all 64-bit code issues, of which there may be some non-trivial issues. How do I force make/GCC to show me the commands? That could create all kinds of trouble. Since gcc compiles that you are performing arithmetic between void* and an int (1024). Keep in mind that thrArg should exist till the myFcn() uses it. 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]. Otherwise, if the original pointer value points to an object a, and there is an object b of the . 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. 10) A prvalue of type pointer to void (possibly cv-qualified) can be converted to pointer to any object type. Safe downcast may be done with dynamic_cast. Then i can continue compiling. 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. In a 64bit build a pointer is 64bit (contrary to a 32bit build, where it is 32bit), while an int is 32bit, so this assignment stores a 64bit value in a 32bit storage, which may result in a loss of information. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. An open (void) pointer can hold a pointer of any type. So you know you can cast it back like this. casting from int to void* and back to int. Asking for help, clarification, or responding to other answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? unsigned long call_fn = (unsigned long)FUNC; The dynamic_cast<>operator provides a way to check the actual type of a pointer to a polymorphic class. ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] It is purely a compile-time directive which instructs the compiler to treat expression as if it had . Disconnect between goals and daily tasksIs it me, or the industry? Yeah, the tutorial is doing it wrong. whether it was an actual problem is a different matter though. I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread.