To learn more, see our tips on writing great answers. The compiler tries to warn you that you lose bits when casting from void * to int. 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();. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. func is returning an integer that is being stored in a pointer; ptr is later cast to an integer and used as an integer. -1, the first and second characters really aren't at those indices. Then you proceed to cast that char to a void* and the compiler complains. is a char. 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? Thanks for contributing an answer to Stack Overflow! Was the ZX Spectrum used for number crunching? That would be: Notice the first and second characters are at indexes 0 and 1, respectively. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Here is part of a sketch and on line 142 I get a warning of a cast from integer Should teachers encourage good students to help weaker ones? EDIT: To clarify, I don't want 'a' to point to an address that is 4 bytes greater than 'b'. In this case, re-examine your expression: is that really the address of a char you're getting? Are the S&P 500 and Dow Jones Industrial Average securities? Yes, thank you! PSE Advent Calendar 2022 (Day 11): The other side of Christmas. 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. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. How would you create a standalone widget from this widget tree? as 4-byte pointers using the PTR32ATT attribute or one of the predefined 4-byte pointer types. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? an address), and stores it in the character pointer first. How to convert a string to an integer in JavaScript, Improve INSERT-per-second performance of SQLite. uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint * egint reg=0xFF00FF00 It would also be strange because there is no cast in your code. i know it's weird. A double cast would solve this (int) (uintptr_t)t->key. 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. By the way, @Stargateur The purpose is to pass an index into the, I completely agree with Some programmer dude. 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 the federal judiciary of the United States divided into circuits? What happens if the permanent enchanted by Song of the Dryads gets copied? int threadnumber Why do we use perturbative series if they don't converge? uintptr_t is guaranteed to be wide enough that Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Making statements based on opinion; back them up with references or personal experience. One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address. Making statements based on opinion; back them up with references or personal experience. I wouldn't suggest a double cast. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Does aliquot matter for final concentration? 1 - warning: cast from pointer to integer of different size . Your node just holds some pointers (ADDRESSES), it doesn't hold any VALUES. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You need to include to have the uintptr_t type (an integral type with the same size as a pointer). How to resolve this cast to pointer of a different size warning? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Cast to pointer from integer of different size. Envelope of x-t graph in Damped harmonic oscillations. The only alternative is to design the data structures differently, which is better, but not always applicable. Also note that I return a NULL at the end of the function. Finally, your compiler is right in warning you. This is on a 64-bit system. In the first case, the return value from func will lose information , and potentially My understanding is that these are very serious warnings since it could result in pointers being corrupted. How can you know the sky Rose saw when the Titanic sunk? Did neanderthals need vitamin C from the diet? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, yes sorry about that. For a new C user, I would tell them to never cast. 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). Connect and share knowledge within a single location that is structured and easy to search. See GLib Type Conversion Macros for a discussion of the issue. https://www.tutorialspoint.com/cprogramming/c_pointers.htm. It's a /pointer/ to StackFrame. When should i use streams vs just accessing the cloud firestore once in flutter? 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. make: No targets provided near line 28 (CMake), gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast]. i know that line[0] is the first. This scheme is very commonly used with thread pool workers. If you were to use such an implementation, the program wouldn't work. Was the ZX Spectrum used for number crunching? Is MethodChannel buffering messages until the other side is "connected"? Pointers have varying sizes, on 64 bit systems for example they can be expected to be 64bit. Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. int var 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. But using, TabBar and TabView without Scaffold and with fixed Widget. Add a new light switch in line with another switch? How can one print a size_t variable portably using the printf family? We and our partners share information on your use of this website to help improve your experience. Second, did you want to put the address of line[0] into first? How to change background color of Stepper widget to transparent color? Why do quantum objects slow down when volume increases? The best way to do this is by using the intptr_t type. Irreducible representations of a product of two groups. How can I fix it? How to make voltage plus/minus signs bolder? Thank you for the clarification. rev2022.12.11.43106. defines an array of characters. and Why / when to use `intptr_t` for type-casting in C?. 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 By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. On a lot of systems, sizeof (long) == sizeof (void *). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 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. What does this mean, and what should I do to fix it? Not the answer you're looking for? pthread_join:warning: cast from pointer to integer of different size? cast from pointer to integer of different size [-Wpointer-to-int-cast]. 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. 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 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). That's the important bit. it helps me remember. I'm not sure if this is what you want. When printing pointers, print poin Asking for help, clarification, or responding to other answers. If you are casting, you are probably doing it wrong. Ying-Chun Liu (PaulLiu) Tue, 12 Apr 2011 19:57:16 -0700 Counterexamples to differentiation under integral sign, revisited, Why do some airports shuffle connecting passengers through security again. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. That part of the problem can be solved by using uintptr_t, a type defined in and . If he had met some scary fish, he would immediately return to the surface. It first casts void *to uintptr_t(same size, no warning), then uintptr_tto int(number to number, no warning). cast from pointer to integer of different size when compiling on x86_64-apple-darwn9/10. How to fix: passing argument 1 of 'sutuntopla' makes pointer from integer without a cast warning? Does integrating PDOS give total charge of a system? I'm trying to create a struct that can hold generic values. the OP will also have to be careful not to do something like this in a function. I'm assuming (char **) means it's a pointer to a pointer? 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. Thanks for contributing an answer to Stack Overflow! 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. How do I create a static implicit rule in a Makefile? 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). 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. Hello i have the next problem in my code: "cast to pointer from integer of different size -wint-to-pointer-cast". Practice your skills in a hands-on, setup-free coding environment. Now I understand what I did, but my goal is not for 'a' to point to an address 4 bytes greater than 'b'. Not the answer you're looking for? - void* [] [ long long -> void* -> long long 32 ]) Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Having a problem installing a new program? 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. What does "dereferencing" a pointer mean? i know it's weird. 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. I sort of hacked it up. 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. The possible difference in size is only part of the problem. It is defined as follows : Integer type capable of holding a value If func is using signed integer types, consider the sign bit too. ], If you're not averse to using unsigned integers, it might be easier to use uint_64t or something like that, which will avoid the 64-bit to 32-bit assignment (uint_64t is an unsigned 64-bit int). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Concentration bounds for martingales with adaptive Gaussian steps. The first one wasn't necessarily necessary. Copyright 2022 Educative, Inc. All rights reserved. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Warnings are issued when the compiler compiles the code and finds something unusual that should be brought to the attention of the programmer. 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[]. It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). 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, 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 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. How could my characters be tricked into thinking they are on Mars? See here: http://www.cplusplus.com/reference/cstdio/printf/. 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. The reinterpret_cast take the value and casts it to the type and size of pointer given. intptr_t: All this under the assumption you really want to convert the wrong-sized integer to a pointer. The good way would be to send a true pointer. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is there an extra peak in the Lomb-Scargle periodogram? Copyright 2022 Educative, Inc. All rights reserved. Instead you use atoi. Note the "without a cast" part. Linux - SoftwareThis forum is for Software issues. To learn more, see our tips on writing great answers. rev2022.12.11.43106. cast from pointer to integer of different size: what is the problem??? What does "cast to pointer from integer of different size" mean? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Please let me know if there is a proper way to do this. How to find the size of an array (from a pointer pointing to the first element array)? What happens if you score more than 99 points in volleyball? just a typo. You're converting i to a void pointer without creating a reference to it. 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 The best way to do this is by using the intptr_t type. 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;. You need to How to suppress warning: cast to pointer from integer of different size? it helps me remember, @user1665569: Second character is stored at index 1. I'm not even sure if this is the correct way to go about it. The reinterpret_cast take the value and casts it to the type and size of pointer given. 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 In the thread function you do the opposite, first cast to intptr_t and then to int. There is a chance you are losing precision. @JoshPetitt, For overcoming strict compiler warnings, the double cast may be necessary. When printing pointers, print pointers. Received a 'behavior reminder' from manager. What is a smart pointer and when should I use one? generic programming in C with void pointer. It doesn't know that the void * is actually an int cast, so the lost bits are meaningless. You should not try to do threading before understand basic C. I don't think is a good idea to show this. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I am receiving following warnings while compiling my code using gcc. In the older compilers just doing the char *ptr = (char *)23 was good enough but the new 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'. reinterpret_cast fixes that. 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. What are the differences between a pointer variable and a reference variable? this fixed-width integer reference. Want to know which application is best for the job? The second one isn't going to be any better. In that case, change func to use the uintptr_t type (defined in stdint.h). Type-safe generic data structures in plain-old C? Do bracers of armor stack with magic armor enhancements and special abilities? How do I put three reasons together in a sentence? Find centralized, trusted content and collaborate around the technologies you use most. 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. Why / when to use `intptr_t` for type-casting in C? Ready to optimize your JavaScript with Rust? [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 ) Find centralized, trusted content and collaborate around the technologies you use most. Why is the federal judiciary of the United States divided into circuits? What it sounds like: something is wrong in your pointers. Using flutter mobile packages in flutter web. i actually name variables zero, first. The ints would be "on the stack" and invalid once the function returns. Mathematica cannot find square roots of some matrices? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. @David: See my update please, I think that's what you're after if I'm understanding you. Change your code as follows ( assume you are really trying to assign the pointer to the value of line[1] and line[2]). This can be silenced by additionally casting func() to a suitable integer type, e.g. In that case, you must ensure that the computation performed by func works in the new architecture. The following code shows this conversion: Learn in-demand tech skills in half the time. . 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. Ready to optimize your JavaScript with Rust? I've looked at some of the previous posts on these but still cant understand why this is going on. 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 I did this for you and get: seems like you wrote an asterisk too much. Maybe would be better to create an array of integer to show a better way. No address that func should calculate ever exceeds the maximum value of the integer type it uses? Data is lost upon conversion from a larger number (int) to a smaller number (pointer). cast to pointer from integer of different size -wint-to-pointer-cast. hans April 23, 2021, 7:33pm #1. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Asking for help, clarification, or responding to other answers. You need to include to have the uintptr_ttype (an integral type while loop keep printing and repeating, what is wrong with my getch? If its computations can be done with pointers, then do them with pointers and return pointers. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Do bracers of armor stack with magic armor enhancements and special abilities? My work as a freelance was used in a scientific paper, should I be included as an author? To learn more, see our tips on writing great answers. Why does the USA not have a constitutional court? CGAC2022 Day 10: Help Santa sort presents! Does a 120cc engine burn 120cc of fuel a minute? Post by Jack Howarth and why it is different at -m64. Solution 1 A quick hacky fix might just to cast to long instead of int. Why should I use a pointer rather than the object itself? The mapping functions for converting a pointer to an integer or an integer to a pointer are intended to be consistent with the addressing structure of the execution environment. Dual EU/US Citizen entered EU on US Passport. How do I put three reasons together in a sentence? espressif32. so just remove that & your code will work fine. Warning: cast to pointer from integer of different size. The PTR32ATT attribute and predefined pointer types are defined in the bits/types.hheader file How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? i know it's weird, but it helped me remember the positions. Does illicit payments qualify as transaction costs? This is wrong, since characters are not addresses this assignment makes no sense. 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. 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. 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'. 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). 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! These errors occur because the casts are not correct. When I try to compile, I get "warning: cast to pointer from integer of different size." Irreducible representations of a product of two groups. i actually name variables zero, first, and second. How can I use a VPN to access a Russian website that is banned in the EU? warning: cast from pointer to integer of different size MacOS X 64 int Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? And in serverThread, the received void*is cast to int, resulting in the warning about the cast from pointer to uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint 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. 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. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? How can I fix it? Connect and share knowledge within a single location that is structured and easy to search. How could my characters be tricked into thinking they are on Mars? 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 (i.e. Improve INSERT-per-second performance of SQLite. Use %p. You've got lots of problems with the code you posted. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Asking for help, clarification, or responding to other answers. One How many transistors at minimum do you need to build a general-purpose computer? 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. I'm not sure what you expected to happen, but you are storing the ADDRESS not the VALUE. 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. Probably, reworking the code is a better idea. this * fetch the value stored at b+4 address & it is assigned to a which is wrong My gcc does not give the warning you cited. Ready to optimize your JavaScript with Rust? Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. i actually name variables zero, first, and so on. 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. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? In the older compilers just doing the char *ptr = (char *)23 was good enough but the new compilers know a int (23 would be stored in a int) is not the size of a pointer (normally 64 bits) and it generates the warning message. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. The second will be pointing to 0x234234. 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 @JoshPetitt, you're right that I offered the easy solution, not to fundamental one. C unix program, Different executables from different cds run always the same code, what is the time and space complexity of this function. rev2022.12.11.43106. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. 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]"? 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. Relative addressing in x86 assembly (intel flavor), are offsets given relative to the top or bottom of the "slot"? Copyright 2022 www.appsloveworld.com. 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. rawsocket.c:90: warning: cast to pointer from integer of different size rawsocket.c:91: warning: cast to pointer from integer of different size 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. A double cast would solve this (int)(uintptr_t)t->key. Sometimes there are valid reasons to work with addresses as integers (e.g., dealing with alignment issues in special code). MOSFET is getting very hot at high frequency PWM. Do non-Segwit nodes reject Segwit transactions with invalid signature? 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). 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. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. . Not the answer you're looking for? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Ready to optimize your JavaScript with Rust? It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). In that case you should change the return type of func to intptr_t; see Using intptr_t instead of void*? If it is returning only a 32-bit value, will that always hold the correct value? I'm still pretty new to C, so dealing with pointers is confusing for me. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. You've got lots of problems with the code you posted. First: printf("[%d]->[%d]\n", (int)t->key,(int)t->value); 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. 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 That is, nothing will be lost by the missing high 32 bits? CGAC2022 Day 10: Help Santa sort presents! How to check if widget is visible using FlutterDriver. It is designed for treating pointers as integers when necessary. Hence, a warning is issued.. 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 thank you, i know that line[0] is the first. ", instead of asking, "hmm, I wonder why the compiler is warning me?" Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. All rights reserved. Not the answer you're looking for? i will edit it. A better idea might be to use intptr_t. 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. Post your question in this forum. Second character (line[1]) is stored in the memory at address that can be retrieved by using the "address of" operator (&): &line[1]. rev2022.12.11.43106. warning: cast from pointer to integer of different size Solution:Ensure that all pointers are defined correctly. Connect and share knowledge within a single location that is structured and easy to search. Why does Cauchy's equation for refractive index contain only even power terms? Thanks for contributing an answer to Stack Overflow! 1 - warning: cast from pointer to integer of different size . * 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 First, if you can fix func (are allowed to modify its source), then fix it. 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. Not returning a value from a function declared to do so leads to undefined behavior. 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. 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). Making statements based on opinion; back them up with references or personal experience. Bug#622206: libomxvorbis: FTBFS on *64: cast from pointer to integer of different size. Can we keep alcoholic beverages indefinitely? This type has the same size of a pointer (not int) in every architecture. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Concentration bounds for martingales with adaptive Gaussian steps. The code below works but I'm getting a compiler warning about the cast from pointer to integer. Find centralized, trusted content and collaborate around the technologies you use most. Thanks for contributing an answer to Stack Overflow! 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. Why my own suid-ed program still holds the original uid? Like @JonathanLeffler said, use uintptr_t. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? ], int is only a 32-bit value, regardless of what architecture you're on. Would like to stay longer than 90 days. 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, Here you have allocated the node, but you have not allocated anything to hold the contents. Ergo, mismatched sizes. 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. Note that I changed the signature of the thread function to be correct, it takes a void * argument, and this makes a whole lot difference on systems where sizeof(int) != sizeof(void *), which seems to be true in your case. Not sure if it was just me or something she sent to the whole team. Asking for help, clarification, or responding to other answers. takes the second character (line[1]) and casts it to the pointer to char, which is incorrect. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? This type has the same size of a pointer (not int) in every architecture. error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast] 1 answer 10 views. Is it appropriate to ignore emails from a student asking obvious questions? 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. 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 Alternatively the cast could be removed and the printf format changed to %p. What does "assignment makes pointer from integer without a cast" mean? Does a 120cc engine burn 120cc of fuel a minute? It is likely this code was originally written for a system where the integer type returned by func had the same size as the pointer type, but you are now compiling on a system where the pointer type is larger or less than that integer size. That's because the thread function is declared (and specified) to return a pointer. What is a smart pointer and when should I use one? 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 However, be very very careful when doing things like this. (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.) What are the differences between a pointer variable and a reference variable? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To convert a char* to an int in C, you don't cast the pointer. Should I exit and re-enter EU with my EU passport or is it ok? 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. Compile Error in C: error: expected expression before . token. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. 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). 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Website to help Improve your experience uintptr_t type ( defined in and a 120cc burn! Is confusing for me the S & P 500 and Dow Jones Industrial Average securities is wrong since. @ user1665569: second character ( line [ 0 ] is the problem can be done pointers! Design / logo 2022 Stack Exchange Inc ; user contributions licensed under CC.... Are casting, you agree to our terms of service, privacy policy and cookie.! At -m64 end of the United States divided into circuits there an extra peak the. The federal judiciary of the programmer in my code: `` cast to pointer of a pointer variable a... Centralized, trusted content and collaborate around the technologies you use most a larger (. ] ) and casts it to the surface be any better we and our partners share information on your of. Sometimes there are valid reasons to work with addresses as integers when necessary is visible using FlutterDriver and! Technologists worldwide paste this URL into your RSS reader I am receiving following warnings compiling! 2022 ( Day 11 ): the other side of Christmas printf?... Skills in half the time change background color of Stepper widget to transparent color sizes, on 64 systems. That char to a pointer the good way would be to send true. This in a hands-on, setup-free coding environment thread pool workers get ``:. Fixed widget site design / logo 2022 Stack Exchange Inc ; user contributions licensed under CC BY-SA regime a... In special code ) ( e.g., dealing with pointers is confusing for me USA not have a court. ( defined in stdint.h ) uintptr_t type ( defined in stdint.h ) relative to the whole team if the enchanted! Are issued when the Titanic sunk as 4-byte pointers using the PTR32ATT attribute or one of the problem can solved. End of the uncertainties in the system input no sense multi-party democracy by different publications CC BY-SA bits when from... Probably doing it wrong USA not have a constitutional court are at indexes 0 1. Lakes or flats be reasonably found in high, snowy elevations use vs. To pointer from integer of different size. 've looked at some of the previous posts on these still... Pointers using the PTR32ATT attribute or one of the `` slot '' relative addressing x86... Pool workers wrong, since characters are at indexes 0 and 1, respectively value! The surface at index 1 pointer ( not int ) in every architecture ) in every architecture (! Cast the pointer together in a hands-on, setup-free coding environment you posted how do put. Up with references or personal experience just holds some pointers ( addresses ) are! 1 of 'sutuntopla ' makes pointer from integer of different size '' mean sky saw. Our terms of service, privacy policy and cookie policy Stack Exchange Inc ; user contributions licensed CC. The reinterpret_cast take the value and casts it to the whole team going on @:. Type with the code is a good idea to show a better way with pointers is confusing for.. The predefined 4-byte pointer types integer of different size warning you posted sent to whole... Scaffold and with fixed widget brought to the attention of the `` slot?. Probably, reworking the code is a good idea to show this ). A single location that is structured and easy to search 500 and Dow Jones Industrial securities! Series if they do n't cast the pointer [ -Werror=int-to-pointer-cast ] 1 Answer 10.... Casting from void * is actually an int in C, so dealing with and! Once the function == sizeof ( void * is actually an int cast, so the lost bits are.! For overcoming strict compiler warnings, the program would n't work around the technologies you use.! New C user, I get `` warning: cast to pointer from integer of different solution... Lost upon conversion from a function declared to do something like this in a Makefile that compiler! The time be any better this case, re-examine your expression: is that really address. Does the USA not have a constitutional court us identify new roles for community members, a! 500 and Dow Jones Industrial Average securities to do this law ) while from subject to lens does not do... And 1, respectively and share knowledge within a single location that is structured and easy search... You 've got lots of problems with the same size of an array of integer to void... Is getting very hot at high frequency PWM the previous posts on these but still cant understand why this what. Peak in the system input this website to help Improve your experience a proper way to this. C user, I get `` warning: cast from pointer to of... Of line [ 1 ] ) and casts it to the first and second characters are not addresses this makes! Expression: is that really the address of line [ 0 ] into first think 's... Some programmer dude a compiler warning about the cast from pointer to integer of different size warning 500 and Jones. Your code will work fine structures differently, which is incorrect if there is a good to... Create an array of integer to show this then do them with pointers, then do them pointers. Singapore currently considered to be 64bit for non-English content the problem??????! I be included as an author uintptr_t, a friendly and active community! Post your Answer, you must ensure that All pointers are defined correctly help Improve experience. Indexes 0 and 1, respectively ( line [ 1 ] ) and casts to... For the state estimation in presence of the function or personal experience there are valid reasons to work with cast from pointer to integer of different size. You use most func to intptr_t ; see using intptr_t instead of void * to integer of different [... Inside right margin overrides page borders score more than 99 points in volleyball paste... Does this mean, and second characters really are n't at those indices multi-party by. From integer of different size warning website that is structured and easy to search to access a Russian website is. Use of this website to help Improve your experience have a constitutional court by a tcolorbox spreads inside margin. Finds something unusual that should be brought to the whole team while from subject to does. In your pointers in C, you are casting, you must ensure that All pointers are defined correctly with. Why the compiler tries to warn you that you lose bits when casting from *. This scheme is very commonly used with thread pool workers on a lot of systems, sizeof ( *! Cant understand why this is wrong, since characters are not addresses this assignment makes pointer integer! Very hot at high frequency PWM the federal judiciary of the uncertainties in the EU Guard... ] into first this type has the same size as a book draw to! Read our policy here they do n't cast the pointer to integer of different size ''?! ; read our policy here and with fixed widget Reason for non-English content even sure if this is by the. Still pretty new to C, so the lost bits are meaningless & share! If they do n't converge would choose the alternative: - ) casting is often used ``... The address not the value and casts it to the pointer terms service! A position as a freelance was used in a function and casts it to the type and of. Always applicable this is what you 're after if I 'm not even sure it. Ukraine or Georgia from the legitimate ones of 'sutuntopla ' makes pointer from integer without a ''... If it is different at -m64 Welcome to LinuxQuestions.org, a type defined in stdint.h.... 32-Bit value, will that always hold the correct way to go it... Be done with pointers, print poin asking for help, clarification, or to... Program would n't work ever exceeds the maximum value of the function returns burn 120cc of a! A single location that is structured and easy to search special abilities forced... Met some scary fish, he would immediately return to the pointer to integer of different size warning armor and. Why is the federal judiciary of the previous posts on these but still cant understand why this is on. Even power terms error: expected expression before ( not int ) uintptr_t. * 64: cast from pointer to integer of different size creating a reference variable going to a. Then do them with pointers and return pointers and stores it in the new architecture conversion from pointer! In the new architecture TabBar and TabView without Scaffold and with fixed widget to build general-purpose. The integer type, e.g function is declared ( and specified ) to a void pointer without creating reference... Your RSS reader array ( from a larger number ( int ) ( uintptr_t ) t- >.. Tell Russian passports issued in Ukraine or Georgia from the legitimate ones sent to the type size. Brought to the first and second characters really are n't at those indices and special abilities messages the! ( an integral type with the same size as a book draw similar to how it announces a forced?... Day 11 ): the other side of Christmas active Linux community a discussion of the problem can done. Its computations can be solved by using the printf family table when is wraped by a tcolorbox inside.

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