We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Find centralized, trusted content and collaborate around the technologies you use most. When printing pointers, print poin In this case, re-examine your expression: is that really the address of a char you're getting? Sometimes there are valid reasons to work with addresses as integers (e.g., dealing with alignment issues in special code). Is it appropriate to ignore emails from a student asking obvious questions? Change your code as follows ( assume you are really trying to assign the pointer to the value of line[1] and line[2]). When I try to compile, I get "warning: cast to pointer from integer of different size." Do bracers of armor stack with magic armor enhancements and special abilities? Not sure if it was just me or something she sent to the whole team. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I'm not even sure if this is the correct way to go about it. If func is using signed integer types, consider the sign bit too. uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint In the first case, the return value from func will lose information , and potentially Connect and share knowledge within a single location that is structured and easy to search. What you want is probably the address of that character, which you can get by using the "address of" operator, &: which can also be written using pointer arithmetic as: Note, however, that C indexes from zero, so the first character is really at lines[0]: First, I'm sure it's just a typo, but you declared char lines[] instead of char line[]. Why should I use a pointer rather than the object itself? Can we keep alcoholic beverages indefinitely? It first casts void *to uintptr_t(same size, no warning), then uintptr_tto int(number to number, no warning). One Maybe would be better to create an array of integer to show a better way. That's the important bit. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Making statements based on opinion; back them up with references or personal experience. How to make voltage plus/minus signs bolder? In my program, I know that the value stored at ((char *)b + 4) is itself another pointer, and I want to store this pointer in 'a'. If he had met some scary fish, he would immediately return to the surface. If you have ensured that the value returned by func is correct, then you can use explicit casts, such as: some_struct *ptr = (some_struct *) (intptr_t) func();. Asking for help, clarification, or responding to other answers. This scheme is very commonly used with thread pool workers. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Irreducible representations of a product of two groups. These errors occur because the casts are not correct. I sort of hacked it up. generic programming in C with void pointer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Should teachers encourage good students to help weaker ones? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. defines an array of characters. This is wrong, since characters are not addresses this assignment makes no sense. ], int is only a 32-bit value, regardless of what architecture you're on. (i.e. What happens if you score more than 99 points in volleyball? Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? The best way to do this is by using the intptr_t type. Then you proceed to cast that char to a void* and the compiler complains. How would you create a standalone widget from this widget tree? Also note that I return a NULL at the end of the function. This is on a 64-bit system. How can I fix it? In the older compilers just doing the char *ptr = (char *)23 was good enough but the new espressif32. But using, TabBar and TabView without Scaffold and with fixed Widget. thank you, i know that line[0] is the first. i know it's weird. How to change background color of Stepper widget to transparent color? What does "assignment makes pointer from integer without a cast" mean? To learn more, see our tips on writing great answers. is a char. What is a smart pointer and when should I use one? cast from pointer to integer of different size [-Wpointer-to-int-cast]. Why my own suid-ed program still holds the original uid? Finally, your compiler is right in warning you. Warnings are issued when the compiler compiles the code and finds something unusual that should be brought to the attention of the programmer. this * fetch the value stored at b+4 address & it is assigned to a which is wrong Note the "without a cast" part. I personally prefer to make the conversion explicit and easy to verify by using macros (in the hopes that learners notice the issue); in this case, perhaps. One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address. See here: http://www.cplusplus.com/reference/cstdio/printf/. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Syntax and Sample Usage of _Generic in C11, How to use native C library in flutter package, How to call a named constructor from a generic function in Dart/Flutter, Generic TypeDef does not work with custom class, compiler warning - cast from pointer to integer of different size. Received a 'behavior reminder' from manager. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Now I understand what I did, but my goal is not for 'a' to point to an address 4 bytes greater than 'b'. Originally, that cast was direct, but the intermediate cast to intptr_twas inserted to remove the warning about the cast to pointer from integer of different size. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? This type has the same size of a pointer (not int) in every architecture. i know that line[0] is the first. Connect and share knowledge within a single location that is structured and easy to search. @ugoren, I would choose the alternative :-) Casting is often used to "hush that pesky compiler! A double cast would solve this (int)(uintptr_t)t->key. How can one print a size_t variable portably using the printf family? Mathematica cannot find square roots of some matrices? while loop keep printing and repeating, what is wrong with my getch? How to check if widget is visible using FlutterDriver. i actually name variables zero, first, and second. For example, if the pointers in a system are stored in 16 bits, but integers are stored in 8 bits, a total of 8 bits would be lost in the given conversion. reinterpret_cast fixes that. That's because the thread function is declared (and specified) to return a pointer. What happens if the permanent enchanted by Song of the Dryads gets copied? Add a new light switch in line with another switch? Should I exit and re-enter EU with my EU passport or is it ok? If its computations can be done with pointers, then do them with pointers and return pointers. The reinterpret_cast take the value and casts it to the type and size of pointer given. You're converting i to a void pointer without creating a reference to it. Instead you use atoi. takes the second character (line[1]) and casts it to the pointer to char, which is incorrect. Making statements based on opinion; back them up with references or personal experience. It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). Here you have allocated the node, but you have not allocated anything to hold the contents. In that case, you must ensure that the computation performed by func works in the new architecture. No address that func should calculate ever exceeds the maximum value of the integer type it uses? How to resolve this cast to pointer of a different size warning? You've got lots of problems with the code you posted. First: printf("[%d]->[%d]\n", (int)t->key,(int)t->value); Yes, thank you! Dual EU/US Citizen entered EU on US Passport. I'm trying to create a struct that can hold generic values. . Ergo, mismatched sizes. cast to pointer from integer of different size -wint-to-pointer-cast. Relative addressing in x86 assembly (intel flavor), are offsets given relative to the top or bottom of the "slot"? What does "dereferencing" a pointer mean? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It would also be strange because there is no cast in your code. i actually name variables zero, first, and so on. Concentration bounds for martingales with adaptive Gaussian steps. Not returning a value from a function declared to do so leads to undefined behavior. What does this mean, and what should I do to fix it? I'm not a spanish speaker, but I can assume you meant to do: Otherwise, you've created a reference to memory address i, and there's nothing you can touch in memory with such a low address :P. Also, casting explicitly to and from void pointers is a something to avoid. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Was the ZX Spectrum used for number crunching? We and our partners share information on your use of this website to help improve your experience. an address), and stores it in the character pointer first. Thanks for contributing an answer to Stack Overflow! func is returning an integer that is being stored in a pointer; ptr is later cast to an integer and used as an integer. warning: cast from pointer to integer of different size Solution:Ensure that all pointers are defined correctly. cast to pointer from integer of different size [-Wint-to-pointer-cast] Submitted: 2018-02-27 18:22 UTC: Modified: 2018-02-27 18:45 UTC: Votes: 4: Avg. i know it's weird. Hello i have the next problem in my code: "cast to pointer from integer of different size -wint-to-pointer-cast". Thus you can make gcc silent by casting (without changing the behaviour): Then, you will get your warning ("cast to pointer from integer of different size") iff the return type of func does not fit for addresses. Asking for help, clarification, or responding to other answers. I've patched off of the warnings on x86_64 darwin with the changes below --- openmotif-2.3.2/lib/Xm/DragBS.c.org 2009-08-29 10:27:40.000000000 -0400 warning: cast from pointer to integer of different size MacOS X 64 int Was the ZX Spectrum used for number crunching? -1, the first and second characters really aren't at those indices. Connect and share knowledge within a single location that is structured and easy to search. Why / when to use `intptr_t` for type-casting in C? Why is the federal judiciary of the United States divided into circuits? @David: See my update please, I think that's what you're after if I'm understanding you. I've looked at some of the previous posts on these but still cant understand why this is going on. Here is part of a sketch and on line 142 I get a warning of a cast from integer Not the answer you're looking for? Making statements based on opinion; back them up with references or personal experience. However, be very very careful when doing things like this. One such type, designed for the very purpose of being large enough to hold any integer or pointer, is intptr_t, described in e.g. To learn more, see our tips on writing great answers. Copyright 2022 Educative, Inc. All rights reserved. If you cannot fix func, then you can use casts to tell the compiler that you intend to do the conversions that are being performed. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Thanks for contributing an answer to Stack Overflow! rev2022.12.11.43106. Counterexamples to differentiation under integral sign, revisited, Why do some airports shuffle connecting passengers through security again. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. To learn more, see our tips on writing great answers. Assuming it's the cast of the i variable that causes the problem, first cast it to an integer type that is larger than int and at the same time large enough to hold a pointer. Warning in C: assignment makes integer from pointer without a cast, "assignment makes integer from pointer without a cast " warning in c, Assignment makes integer from pointer without a cast warning, I'm getting warning "cast to pointer from integer of different size", How to fix " assignment makes pointer from integer without a cast [-Wint-conversion]"? This can be silenced by additionally casting func() to a suitable integer type, e.g. as 4-byte pointers using the PTR32ATT attribute or one of the predefined 4-byte pointer types. Is MethodChannel buffering messages until the other side is "connected"? PSE Advent Calendar 2022 (Day 11): The other side of Christmas. There is a chance you are losing precision. You need to We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Pointer to the second character should be initialized by using the address, where this character resides: takes the character at lines[1], converts it through a forced cast to char * (pointer to character, i.e. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. That would be: Notice the first and second characters are at indexes 0 and 1, respectively. Not the answer you're looking for? Cast to pointer from integer of different size. The reinterpret_cast take the value and casts it to the type and size of pointer given. pthread_join:warning: cast from pointer to integer of different size? That part of the problem can be solved by using uintptr_t, a type defined in and . Because at -m32, you have ILP32, and at -m64, you get LP64, and it's only when pointers are bigger than ints that you'll get the warning, and longs are the same size as pointers in both cases. It doesn't know that the void * is actually an int cast, so the lost bits are meaningless. How do I put three reasons together in a sentence? If you want to point the the address of line[1] and line[2] you would do the &line[] as describe above and you will not have to use reinterpret_cast to stop the warning messages about size: The first will be pointing to 0x000002 but then *((char *)b+4) is dereferencing (char *)b+4, so that's type char -- and you're then trying to cast that thing, which is probably 1 byte, into a 4 or 8 byte address. If you were to use such an implementation, the program wouldn't work. rev2022.12.11.43106. The compiler tries to warn you that you lose bits when casting from void * to int. Fixed by #9125 Contributor mbiebl commented on Jan 2, 2018 Submission type Bug report systemd version the issue has been seen with v236 Used distribution When compiling systemd on i386 I get the following warnings That's fact that should be known by everyone, so calling it "first" character and then calling first character "zero" character might be confusing, I wouldn't do that :), i know that line[0] is the first. I want to calculate the image size in colors in (Mo) and in black and white in (Ko) so for this I'm using a parameters that are past in a terminal command which are (image length and width). Concentration bounds for martingales with adaptive Gaussian steps. Data is lost upon conversion from a larger number (int) to a smaller number (pointer). Cast to pointer from integer of different size, Cast to pointer from integer of different size (passing int as a const void * parameter), Avoid "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] " in a _generic macro. In the second case, it's less of an issue but to deal with endianness issues you should cast through intptr_t: some_struct *ptr = (some_struct *)(intptr_t)func(); and later int value = (int)(intptr_t)ptr;. The compiler tries to warn you that you lose bits when casting from void * to int . It doesn't know that the void * is actually an int cast, My work as a freelance was used in a scientific paper, should I be included as an author? Asking for help, clarification, or responding to other answers. You don't have to manually cast to void* in C so just this should do: Update for comments: Sounds like you're after this: it would improve the readability, if you wrote the statements apart My understanding is that these are very serious warnings since it could result in pointers being corrupted. cast from pointer to integer of different size when compiling on x86_64-apple-darwn9/10. Using flutter mobile packages in flutter web. it helps me remember, @user1665569: Second character is stored at index 1. The first one wasn't necessarily necessary. Thanks for contributing an answer to Stack Overflow! Copyright 2022 www.appsloveworld.com. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Would like to stay longer than 90 days. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Ying-Chun Liu (PaulLiu) Tue, 12 Apr 2011 19:57:16 -0700 Ready to optimize your JavaScript with Rust? Warning: cast to pointer from integer of different size. MOSFET is getting very hot at high frequency PWM. Hence, a warning is issued.. Does a 120cc engine burn 120cc of fuel a minute? For those curious, while I would normally not recommend casting an integer to a pointer like this, there are exceptions to everything and this is one of the few cases (if not the only one) where such a cast is acceptable. Alternatively the cast could be removed and the printf format changed to %p. cast to pointer from integer of different size, Counterexamples to differentiation under integral sign, revisited, If he had met some scary fish, he would immediately return to the surface. Ready to optimize your JavaScript with Rust? cast to pointer from integer of different size [-Wint-to-pointer-cast] hashibiro 10 3 0 0 7033 2021/05/22 17:59 intpointercastreturnvoid *cast c To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Irreducible representations of a product of two groups. Bug#622206: libomxvorbis: FTBFS on *64: cast from pointer to integer of different size. getting the warning : cast from pointer to integer of different size while cnverting string to integer array and printing unrelated numbers, cast to pointer from integer of different size warning when assigning pointer to function, gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast], pthread_exit() throws warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] warning. I did this for you and get: seems like you wrote an asterisk too much. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It is defined as follows : Integer type capable of holding a value Please let me know if there is a proper way to do this. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In the first case, the return value from func will lose information, and potentially crash or worse, if int is smaller than the size of a data pointer, which it will be on most 64-bit memory models (including Windows and Linux). Did neanderthals need vitamin C from the diet? Find centralized, trusted content and collaborate around the technologies you use most. Find centralized, trusted content and collaborate around the technologies you use most. The code below works but I'm getting a compiler warning about the cast from pointer to integer. I'm not sure if this is what you want. Cast from a pointer to an integer of a different size Problem: I received the following warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] Solution: The GNU I'm assuming (char **) means it's a pointer to a pointer? It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). Asking for help, clarification, or responding to other answers. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Do bracers of armor stack with magic armor enhancements and special abilities? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? make: No targets provided near line 28 (CMake), gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast]. Preferably, func should convert the uintptr_t to a pointer when returning it, so the return type of func would be a pointer (to something, perhaps some_struct or void). You need to include to have the uintptr_ttype (an integral type When should i use streams vs just accessing the cloud firestore once in flutter? C unix program, Different executables from different cds run always the same code, what is the time and space complexity of this function. ", instead of asking, "hmm, I wonder why the compiler is warning me?" rev2022.12.11.43106. cast from pointer to integer of different size: what is the problem??? 1 - warning: cast from pointer to integer of different size . The possible difference in size is only part of the problem. error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast] 1 answer 10 views. The PTR32ATT attribute and predefined pointer types are defined in the bits/types.hheader file This is an example of what my code looks like: The value that (b+4) is pointing to is an address that I want to store in a. How can you know the sky Rose saw when the Titanic sunk? Does a 120cc engine burn 120cc of fuel a minute? Compile Error in C: error: expected expression before . token. Reassigning const char array with unknown size, Modular programming in C (nested headers), While loop runs automatically after calling a method with a switch statement in C, Want to notedown CPU usage and Memory Usage of my C program, why does this error occur: 'conio.h' file not found. Why is the federal judiciary of the United States divided into circuits? Bug #76021: cast to pointer from integer of different size [-Wint-to-pointer-cast] Submitted: 2018-02-27 18:22 UTC: Modified: 2021-08-18 10:54 UTC Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? you are setting your key as a pointer to the contents of address 3, and the value as a pointer to the contents of address 5). Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? My gcc does not give the warning you cited. so just remove that & your code will work fine. How to convert a string to an integer in JavaScript, Improve INSERT-per-second performance of SQLite. Not the answer you're looking for? . i actually name variables zero, first. When printing pointers, print pointers. And in serverThread, the received void*is cast to int, resulting in the warning about the cast from pointer to By the way, @Stargateur The purpose is to pass an index into the, I completely agree with Some programmer dude. Anytime you try to assign a 64-bit value in to a 32-bit value without explicitly casting it the compiler will throw a warning [granted, it could still work but in general is not good practice. hans April 23, 2021, 7:33pm #1. EDIT: To clarify, I don't want 'a' to point to an address that is 4 bytes greater than 'b'. Second character (line[1]) is stored in the memory at address that can be retrieved by using the "address of" operator (&): &line[1]. Error in ./thrash: free(): invalid pointer, C Reading input into an char array in loop, Programmatically populate a uint8_t array, I need to get the directory as a command-line argument using getopt in c. Why is the first value of the array being replaced? cast from pointer to integer of different size [-Wpointer-to-int-cast] I want to calculate the image size in colors in (Mo) and in black and white in (Ko) so for this I'm using a Pointers have varying sizes, on 64 bit systems for example they can be expected to be 64bit. See GLib Type Conversion Macros for a discussion of the issue. Post by Jack Howarth and why it is different at -m64. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. i will edit it. Having a problem installing a new program? 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 A better idea might be to use intptr_t. This type has the same size of a pointer (not int) in every architecture. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? is a pointer to char, as is (char *)b+4 but then * ( (char *)b+4) is dereferencing (char *)b+4, so that's type char -- and you're then trying to cast that thing, which is probably 1 byte, Second, did you want to put the address of line[0] into first? Practice your skills in a hands-on, setup-free coding environment. Like @JonathanLeffler said, use uintptr_t. 1 - warning: cast from pointer to integer of different size . How can I fix it? How could my characters be tricked into thinking they are on Mars? [3/8] exynos_fimg2d: fix cast from pointer to integer of different size Message ID 1393995704-29184-4-git-send-email-djkurtz@chromium.org ( mailing list archive ) On a lot of systems, sizeof (long) == sizeof (void *). Improve INSERT-per-second performance of SQLite. How many transistors at minimum do you need to build a general-purpose computer? Envelope of x-t graph in Damped harmonic oscillations. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? To convert a char* to an int in C, you don't cast the pointer. How could my characters be tricked into thinking they are on Mars? Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? then I try to call the function client_create_no_window by first doing, I keep getting the error casting to pointer from integer of different size. In the thread function you do the opposite, first cast to intptr_t and then to int. Does integrating PDOS give total charge of a system? In that case, change func to use the uintptr_t type (defined in stdint.h). Does illicit payments qualify as transaction costs? Assuming it's the cast of the i variable that causes the problem, first cast it to an integer type that is larger than int and at the same time large enough to hold a pointer. just a typo. One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address.] int is only a 32-bit value, regard int threadnumber To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You've got lots of problems with the code you posted. The second one isn't going to be any better. The warning of cast from pointer to integer of different size occurs when you try to save the value of an integer to a pointer variable, as demonstrated in the code below. To learn more, see our tips on writing great answers. (There is also intptr_t if signed arithmetic is better for some reason, but I generally find the unsigned uintptr_t to be less troublesome.) Your node just holds some pointers (ADDRESSES), it doesn't hold any VALUES. Why does Cauchy's equation for refractive index contain only even power terms? Cast from a pointer to an integer of a different size Problem: I received the following warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] Solution: The GNU Compiler Collection (GCC) 4.6.3 issues a warning when you cast a - void* [] [ long long -> void* -> long long 32 ]) int var We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. How to fix: passing argument 1 of 'sutuntopla' makes pointer from integer without a cast warning? If it is returning only a 32-bit value, will that always hold the correct value? Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Year-End Discount: 10% OFF 1-year and 20% OFF 2-year subscriptions!Get Premium, Learn the 24 patterns to solve any coding interview question without getting lost in a maze of LeetCode-style practice problems. It is defined as follows : Integer type capable of holding a value converted from a void pointer and then be converted back to that type with a value that compares equal to the original pointer. What it sounds like: something is wrong in your pointers. Unless you add an enum field or something that stores the type of value stored at the pointer location-- but that kind of defeats the purpose. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, yes sorry about that. In my program, I know that the value stored at ((char *)b +4) is itself another pointer, and I want to store this pointer in 'a'. Cast to pointer from integer of different size error, Passing argument as int to thread - Warning: cast to pointer from integer different size, Dlsym: cast to pointer from integer of different size, compilation error: cast from pointer to integer of different size, cast to pointer from integer of different size, mud compile - warning: cast from pointer to integer of different size, Warning: cast to pointer from integer of different size, cast to pointer from integer of different size [-Wint-to-pointer-cast], converting argv[3] to int for port number: cast from pointer to integer of different size, Pro*C to C: cast to pointer from integer of different size [-Wint-to-pointer-cast] and note: in definition of macro 'TEND', Passing Argument 1 makes integer from pointer without a cast warning, Using function pointer, but got warning makes pointer from integer without a cast [-Wint-conversion], Different size pointer cast warning in ARM64 system, format %lu expects argument of type 'long unsigned int' but argument 3 has type long long unsigned int, cast from printer to integer of different size. How to find the size of an array (from a pointer pointing to the first element array)? Ready to optimize your JavaScript with Rust? Incompatible types with pointer and linked list remove function, How to use cp (Copy) command in system function in native C code on Android, for, if in assembly language (bubble sort), memcpy() to copy integer value to char buffer. The second will be pointing to 0x234234. What are the differences between a pointer variable and a reference variable? Does aliquot matter for final concentration? @JoshPetitt, you're right that I offered the easy solution, not to fundamental one. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. intptr_t: All this under the assumption you really want to convert the wrong-sized integer to a pointer. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. What does "cast to pointer from integer of different size" mean? uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint * egint reg=0xFF00FF00 uintptr_t is guaranteed to be wide enough that That is, nothing will be lost by the missing high 32 bits? For a new C user, I would tell them to never cast. CGAC2022 Day 10: Help Santa sort presents! Copyright 2022 Educative, Inc. All rights reserved. i2c_arm bus initialization and device-tree overlay, Why do some airports shuffle connecting passengers through security again, Counterexamples to differentiation under integral sign, revisited. I'm still pretty new to C, so dealing with pointers is confusing for me. Linux - SoftwareThis forum is for Software issues. Why does the USA not have a constitutional court? Concentration bounds for martingales with adaptive Gaussian steps, Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup), Central limit theorem replacing radical n with n. Is energy "equal" to the curvature of spacetime? Why is there an extra peak in the Lomb-Scargle periodogram? rev2022.12.11.43106. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. I wouldn't suggest a double cast. First, if you can fix func (are allowed to modify its source), then fix it. https://www.tutorialspoint.com/cprogramming/c_pointers.htm. The only alternative is to design the data structures differently, which is better, but not always applicable. Solution 1 A quick hacky fix might just to cast to long instead of int. Type-safe generic data structures in plain-old C? Post your question in this forum. i know it's weird, but it helped me remember the positions. It's impossible to absolutely know what the value being stored by that pointer is unless you can guarantee that you set the pointer and it's value/type is unchanged. 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. Want to know which application is best for the job? and Why / when to use `intptr_t` for type-casting in C?. A solution using dynamic allocated memory for the value would look something like this: While this solution is more "correct", it is less readable which means it's less maintainable; It has more code which means more chances of errors; And it has the possibility of a memory leak if the free call is forgotten (which sooner or later will happen). I'm not sure what you expected to happen, but you are storing the ADDRESS not the VALUE. The message in codeblocks is: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast] note: my compiler options are -std=c99 -Werror -save What are the differences between a pointer variable and a reference variable? Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, The most efficient way to implement an integer based power function pow(int, int). rawsocket.c:90: warning: cast to pointer from integer of different size rawsocket.c:91: warning: cast to pointer from integer of different size Do non-Segwit nodes reject Segwit transactions with invalid signature? It is designed for treating pointers as integers when necessary. Probably, reworking the code is a better idea. Find centralized, trusted content and collaborate around the technologies you use most. You need to include to have the uintptr_t type (an integral type with the same size as a pointer). The best way to do this is by using the intptr_t type. * Re: [PATCH] efifb: Fix "cast to pointer from integer of different size" 2011-04-19 20:38 [PATCH] efifb: Fix "cast to pointer from integer of different size" Mike Waychison @ 2011-04 Many still look down on such a solution, but still use it since it's easier than the whole malloc-copy-free circus that's otherwise needed. this fixed-width integer reference. It's a /pointer/ to StackFrame. You should not try to do threading before understand basic C. I don't think is a good idea to show this. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. it helps me remember. Connect and share knowledge within a single location that is structured and easy to search. If you are casting, you are probably doing it wrong. Are the S&P 500 and Dow Jones Industrial Average securities? However, this particular error message is telling you that you are not merely converting an integer to a pointer, but that you are converting an integer of one size (e.g., four bytes) to a pointer of another size (e.g., eight bytes). Thank you for the clarification. In that case you should change the return type of func to intptr_t; see Using intptr_t instead of void*? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, cast to pointer from integer of different size [-Wint-to-pointer-cast], warning: cast to pointer from integer of different size [-Wint-to-pointer-cast], assignment makes integer from pointer without a cast [-Wint-conversion], warning: assignment from incompatible pointer type [enabled by default] and cast to pointer from integer of different size [-Wint-to-pointer-cast], Avoid "warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] " in a _generic macro, pthread_exit() throws warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] warning. 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