If any, how can the original function works without errors if we just ignore the warning. 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" (. I am compiling this program in linux gcc compiler.. What is the correct method to cast an int to a void*? ../lib/odp-util.c:5603:13: note: expanded from macro 'SCAN_PUT' Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~. You should perform type conversion based on 64bit build system because the type "int" supports only -32768 ~ 32768. Did i have to face to unexpected runtime issues, i guess not, i've found another discussion on this -. pthread create managing values generated in function (in c), Establishing TCP socket connection between PHP client and C server on Ubuntu. Getting Command /bin/sh failed with exit code 65 Error with Xcode 5.1 . this question. Converts between types using a combination of implicit and user-defined conversions. Such pointers can be stored in 32-bit data types (for instance, int, DWORD). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @Dinesh: could you please 1) show us those. I cannot reverse my upvote of user384706's answer, but it's wrong. Asking for help, clarification, or responding to other answers. If you are going to pass the address you typically need to exert some more control over the lifetime of the object. Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' It's an int type guaranteed to be big enough to contain a pointer. This solution is in accordance with INT18-C. Only the following conversions can be done with static_cast, except when such conversions would cast away constness or volatility. SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? You can only do this if you use a synchronization primitive to ensure that there is no race condition. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? You need to pass an actual pointer. reinterpret_cast is a type of casting operator used in C++. I agree passing a dynamically allocated pointer is fine (and I think the best way). that any valid pointer to void can be converted to this type, then Why is there a voltage on my HDMI and coaxial cables? "After the incident", I started to be more careful not to trip over things. windows meson: cast to smaller integer type 'unsigned long' from 'void *'. From the question I presume the OP does. And then assign it to the double variable. That's not a good idea if the original object (that was cast to void*) was an integer. By clicking Sign up for GitHub, you agree to our terms of service and No idea how it amassed 27 upvotes?! Does Counterspell prevent from any further spells being cast on a given turn? 471,961 Members | 900 Online. Type casting is when you assign a value of one primitive data type to another type. You could use this code, and it would do the same thing as casting ptr to (char*). itch" "-I..\include\windows" "-Iinclude" "-I..\include" "-I..\datapath-windows\include" "-IC:\PTHREADS-BUILT\include" "-Xclang" "-fcolor-diagnostics" "-pipe" ", "? LLNL's tutorial is bad and they should feel bad. return ((void **) returnPtr);} /* Matrix() */. Making statements based on opinion; back them up with references or personal experience. this way you won't get any warning. Mutually exclusive execution using std::atomic? BUT converting a pointer to void* and back again is well supported (everywhere). Here, the Java first converts the int type data into the double type. Returns a value of type new-type. If you need to keep the returned address, just keep it as void*. Does a summoned creature play immediately after being summoned by a ready action? 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.. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Find centralized, trusted content and collaborate around the technologies you use most. *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 . 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. */void **MatrixIB (unsigned long x, unsigned long y, int size){ void *ptr; void **returnPtr; register unsigned long i, j; returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size); for (i=0, j=0; j returnPtr[j] = (void *) (ptr + i); // <<< Compile Errors, Error1error C2036: 'void *' : unknown sizec:\temp\testone\lib\utils.c57, 2> returnPtr[j] = (void *) ((long*)ptr + i); // <<< No compile errors, 3> returnPtr[j] = (void *) ((char*)ptr + i); // <<< No compile errors. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. The cast back to int * is not, though. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? rev2023.3.3.43278. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The int data type is the primary integer data type in SQL Server. The problem just occur with Xcode 5.1. Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. @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. Connect and share knowledge within a single location that is structured and easy to search. To learn more, see our tips on writing great answers. A nit: in your version, the cast to void * is unnecessary. for saving RAM), use union, and make sure, if the mem address is treated as an int only if you know it was last set as an int. error: cast from pointer to smaller type 'unsigned int' loses information. Casting arguments inside the function is a lot safer. Thanks for contributing an answer to Stack Overflow! 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. How do I set, clear, and toggle a single bit? @jackdoe: It's a waste of human life to write code that "you may need in the future". 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. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw p-util.c.obj "-c" ../lib/odp-util.c What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? It is purely a compile-time directive which instructs the compiler to treat expression as if it had . 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 is not a conversion at all. The reinterpret_cast makes the int the size of a pointer and the warning will stop. Connect and share knowledge within a single location that is structured and easy to search. Can Martian regolith be easily melted with microwaves? The high-order 9 bits of the number are used to hold a flag value, and the result is converted back into a pointer. If the destination type is bool, this is a boolean conversion (see below). This is known as implicit type casting or type promotion, compiler automatically converts smaller data type to larger data type. casting from int to void* and back to int. 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 How do I check if a string represents a number (float or int)? SQL Server does not automatically promote . even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. Offline ImPer Westermark over 11 years ago in reply to Andy Neil Except that you sometimes stores an integer in the pointer itself. Thank you all for your feedback. Basically its a better version of (void *)i. The text was updated successfully, but these errors were encountered: ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' 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. 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. Why do small African island nations perform better than African continental nations, considering democracy and human development? 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 ) Whats the grammar of "For those whose stories they are"? Mutually exclusive execution using std::atomic? I get the error: "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0), How Intuit democratizes AI development across teams through reusability. The main point is: a pointer has a platform dependent size. Alternatively, if you choose to castthe ptr variableto (size_t) instead, then you don't need to worry about the pointer typeanymore. My code is all over the place now but I appreciate you all helping me on my journey to mastery! GitHub. Why is this sentence from The Great Gatsby grammatical? Pd = Pa; Similarly, Pc may be type cast to type int and assigned the value Pa. 1. STR34-C. You may declare a const int variable and cast its reference to the void*. Not the answer you're looking for? The program can be set in such a way to ask the user to inform the type of data and . I have looked around and can't seem to find any information on how to do this. Find centralized, trusted content and collaborate around the technologies you use most. 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). That could create all kinds of trouble. Safe downcast may be done with dynamic_cast. 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. Are there tables of wastage rates for different fruit and veg? (i.e. 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. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? Brent Saunders Wife Amy,
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