By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I would create a structure and pass that as void* to pthread_create. The correct answer is, if one does not mind losing data precision. 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. You should perform type conversion based on 64bit build system because the type "int" supports only -32768 ~ 32768. INT31-C. Ensure that integer conversions do not result in lost or In C (int)b is called an explicit conversion, i.e. By clicking Sign up for GitHub, you agree to our terms of service and You are correct, but cocos actually only uses that address as a unique id. Fix for objc/45925 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. All character types are to be converted to an integer. Asking for help, clarification, or responding to other answers. Find centralized, trusted content and collaborate around the technologies you use most. Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul What is the point of Thrower's Bandolier? How do I force make/GCC to show me the commands? Is a PhD visitor considered as a visiting scholar. How to use Slater Type Orbitals as a basis functions in matrix method correctly? Yeah, the tutorial is doing it wrong. Projects. Wrong. even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. Why is this sentence from The Great Gatsby grammatical? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Please tell me error: cast from 'void*' to 'int' loses precision, How Intuit democratizes AI development across teams through reusability. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? For example, if youwrite ((int*)ptr + 1), it will add 4 bytes to the pointer, because "ints" are 4 bytes each. You think by casting it here that you are avoiding the problem! 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 Maybe you can try this too. pthread passes the argument as a void*. Making statements based on opinion; back them up with references or personal experience. Re: [PATCH, PR 53001] Re: Patch to split out new warning flag for Please help me compile Chez Scheme. How can this new ban on drag possibly be considered constitutional? What is the purpose of non-series Shimano components? So you know you can cast it back like this. The code ((void*)ptr + 1) does not work, because the compiler has no idea what size "void" is, and therefore doesn't know how many bytes to add. Thank you all for your feedback. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? To learn more, see our tips on writing great answers. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? If int is no larger than pointer to void then one way to store the value is by simply copying the bytes: int i . Once you manage to make this cast, then what?! From what I read about casting in the C11 standard, my feeling is, that it is arguable to emit a warning on an explicit conversion. Does melting sea ices rises global sea level? This page was last modified on 12 February 2023, at 18:25. a is of type int[4], which can be implicitly cast to int* (ie, a pointer to an int) &a is of type int(*)[4] (ie: a pointer to an array of 4 ints). As with all cast expressions, the result is: Two objects a and b are pointer-interconvertible if: static_cast may also be used to disambiguate function overloads by performing a function-to-pointer conversion to specific type, as in. (i.e. error: cast from pointer to smaller type 'unsigned int' loses information. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. what does it mean to convert int to void* or vice versa? */ >> -bool >> +enum conversion_safety >> unsafe_conversion_p (tree type, tree expr, bool . Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Xcode 5 and iOS 7: Architecture and Valid architectures, xcode build error: Semantic issue cast from pointer to smaller type 'int' loses information, Issues in handling touches on subviews(uiviews) in UIScrollView, Architecture linking error after Xcode 5.1 upgrade, iOS 7.1 gives error after updating to Xcode 5.1, Linker error in Xcode 5.1 with cocos2d-x 3 beta 2. Using Kolmogorov complexity to measure difficulty of problems? Your first example is risky because you have to be very careful about the object lifetimes. 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]. And then assign it to the double variable. 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. 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. You need to pass an actual pointer. In such condition type conversion (type promotion) takes place to avoid loss of data. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. then converted back to pointer to void, and the result will compare Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. reinterpret_cast is a type of casting operator used in C++. If you really need such trickery, then consider one of dedicated types, which are intptr_t and uintptr_t. ../lib/odp-util.c:5658:9: note: expanded from macro 'SCAN_END_SINGLE' For example, if you want to store a 'long' value into a simple integer then you can type cast 'long' to 'int'. But I don't want to edit code in "EAGLView.mm" because it's a "library file". Thanks for contributing an answer to Stack Overflow! 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. What is "cast from integer to pointer of different size" warning? 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 guess the other important fact is that the cast operator has higher precedence that the multiplication operator. 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. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? You can fix this error by replacing this line of code. The int data type is the primary integer data type in SQL Server. what happens when we typecast normal variable to void* or any pointer variable? GitHub. Does Counterspell prevent from any further spells being cast on a given turn? 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. Referring to N1570 7.20.1.4/p1 (Integer types capable of holding object pointers): The following type designates a signed integer type with the property Here is my code: I already tried (void*)M_TABLE_SIZE but then I get an error that I cannot use the * operator. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ncdu: What's going on with this second size column? On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. void* -> integer -> void* rather than integer -> void* -> integer. ncdu: What's going on with this second size column? What happens if you typecast as unsigned first? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Setting a buffer of char* with intermediate casting to int*. So you could do this: Note: As sbi points out this would require a change on the OP call to create the thread. equal to the original pointer: First you are using a define, which is not a variable. What is the purpose of non-series Shimano components? You just need to suppress the warning, and this will do it: This may offend your sensibilities, but it's very short and has no race conditions (as you'd have if you used &i). Cast Operations - Oracle Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, "what happen when typcating normal variable to void* or any pointer variable?" This is known as implicit type casting or type promotion, compiler automatically converts smaller data type to larger data type. Number Type Cast | Qt Forum 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. Does a summoned creature play immediately after being summoned by a ready action? What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. 4. Type Conversions - C in a Nutshell [Book] - O'Reilly Online Learning What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? Have a question about this project? The difference between the phonemes /p/ and /b/ in Japanese, Styling contours by colour and by line thickness in QGIS, AC Op-amp integrator with DC Gain Control in LTspice, Identify those arcade games from a 1983 Brazilian music video. There is absolutely not gurantee that sizeof(int) <= sizeof(void*). Thanks for pointing that out. Implicit Type Conversion in C with Examples - GeeksforGeeks and how to print the thread id of 2d array argument? Replacing broken pins/legs on a DIP IC package, How to handle a hobby that makes income in US. This solution is in accordance with INT18-C. @Shahbaz you could but I will not suggest to a C newbie to use globals. You may declare a const int variable and cast its reference to the void*. Floating-point conversions Yeah, the tutorial is doing it wrong. You are getting warnings due to casting a void* to a type of a different size. In the best case this will give the same results as the original code, with no advantages, but in the worst case it will fail in multiple catastrophic ways (type punning, endianness, less efficient, etc. 471,961 Members | 900 Online. I wish that you write those answer first than the explanation. If your code has the chance to ever be ported to some platform where this doesn't hold, this won't work. Note:You might receive a runtime exception if the pointer contains a value unsuitable for the context. @DietrichEpp can you explain what is race condition with using. 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. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). Converting one datatype into another is known as type casting or, type-conversion. How do I align things in the following tabular environment? Note the difference between the type casting of a variable and type casting of a pointer. AC Op-amp integrator with DC Gain Control in LTspice. B Programming Language | What is the History and Concept? Connect and share knowledge within a single location that is structured and easy to search. C/C++ , Cerror: cast to 'void *' from smaller integer type 'int'. From the question I presume the OP does. On all of them int is 32bit, not 16bit. My code is all over the place now but I appreciate you all helping me on my journey to mastery! What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? It's an int type guaranteed to be big enough to contain a pointer. I'm using cocos2d-x-2.2.2. Implicit Type Conversion is also known as 'automatic type conversion'. Linear regulator thermal information missing in datasheet. What does casting to void* does when passing arguments to variadic functions? 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.