Then you proceed to cast that char to a void* and the compiler complains. Why should I use a pointer rather than the object itself? But using, TabBar and TabView without Scaffold and with fixed Widget. espressif32. ", instead of asking, "hmm, I wonder why the compiler is warning me?" 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). If it is returning only a 32-bit value, will that always hold the correct value? Using flutter mobile packages in flutter web. My understanding is that these are very serious warnings since it could result in pointers being corrupted. 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 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). cast from pointer to integer of different size: what is the problem??? I wouldn't suggest a double cast. Probably, reworking the code is a better idea. In the thread function you do the opposite, first cast to intptr_t and then to int. How would you create a standalone widget from this widget tree? 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;. i know that line[0] is the first. 1 - warning: cast from pointer to integer of different size . i actually name variables zero, first. Having a problem installing a new program? 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? Irreducible representations of a product of two groups. 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. How many transistors at minimum do you need to build a general-purpose computer? rev2022.12.11.43106. I'm still pretty new to C, so dealing with pointers is confusing for me. The only alternative is to design the data structures differently, which is better, but not always applicable. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? Connect and share knowledge within a single location that is structured and easy to search. an address), and stores it in the character pointer first. Asking for help, clarification, or responding to other answers. A double cast would solve this (int) (uintptr_t)t->key. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. We and our partners share information on your use of this website to help improve your experience. Change your code as follows ( assume you are really trying to assign the pointer to the value of line[1] and line[2]). Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Should teachers encourage good students to help weaker ones? It first casts void *to uintptr_t(same size, no warning), then uintptr_tto int(number to number, no warning). To convert a char* to an int in C, you don't cast the pointer. Find centralized, trusted content and collaborate around the technologies you use most. i actually name variables zero, first, and so on. A double cast would solve this (int)(uintptr_t)t->key. int var Making statements based on opinion; back them up with references or personal experience. The best way to do this is by using the intptr_t type. Why do we use perturbative series if they don't converge? Practice your skills in a hands-on, setup-free coding environment. How could my characters be tricked into thinking they are on Mars? Does illicit payments qualify as transaction costs? @JoshPetitt, you're right that I offered the easy solution, not to fundamental one. What happens if you score more than 99 points in volleyball? CGAC2022 Day 10: Help Santa sort presents! A better idea might be to use intptr_t. i will edit it. uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint * egint reg=0xFF00FF00 Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Making statements based on opinion; back them up with references or personal experience. 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. Relative addressing in x86 assembly (intel flavor), are offsets given relative to the top or bottom of the "slot"? Ying-Chun Liu (PaulLiu) Tue, 12 Apr 2011 19:57:16 -0700 These errors occur because the casts are not correct. If func is using signed integer types, consider the sign bit too. This type has the same size of a pointer (not int) in every architecture. The compiler tries to warn you that you lose bits when casting from void * to int. Was the ZX Spectrum used for number crunching? Compile Error in C: error: expected expression before . token. Add a new light switch in line with another switch? 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();. You need to include to have the uintptr_t type (an integral type with the same size as a pointer). I sort of hacked it up. If you are casting, you are probably doing it wrong. The second one isn't going to be any better. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, yes sorry about that. And in serverThread, the received void*is cast to int, resulting in the warning about the cast from pointer to Concentration bounds for martingales with adaptive Gaussian steps. Why is there an extra peak in the Lomb-Scargle periodogram? How could my characters be tricked into thinking they are on Mars? Asking for help, clarification, or responding to other answers. Please let me know if there is a proper way to do this. The good way would be to send a true pointer. I am receiving following warnings while compiling my code using gcc. My work as a freelance was used in a scientific paper, should I be included as an author? 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 In that case, you must ensure that the computation performed by func works in the new architecture. One thing that is useful to remember is that in a 64 bit system, a pointer is a 64 bit value [a memory address. Not the answer you're looking for? How to check if widget is visible using FlutterDriver. 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). 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. 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. Why is the federal judiciary of the United States divided into circuits? Post your question in this forum. How do I put three reasons together in a sentence? 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. Would like to stay longer than 90 days. How do I put three reasons together in a sentence? The code below works but I'm getting a compiler warning about the cast from pointer to integer. Here you have allocated the node, but you have not allocated anything to hold the contents. 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 Hence, a warning is issued.. 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). Maybe would be better to create an array of integer to show a better way. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Thanks for contributing an answer to Stack Overflow! Copyright 2022 Educative, Inc. All rights reserved. * 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 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Does aliquot matter for final concentration? Copyright 2022 Educative, Inc. All rights reserved. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. That's the important bit. rev2022.12.11.43106. You've got lots of problems with the code you posted. First: printf("[%d]->[%d]\n", (int)t->key,(int)t->value); I'm not sure what you expected to happen, but you are storing the ADDRESS not the VALUE. How can I fix it? 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 How can I fix it? 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 Now I understand what I did, but my goal is not for 'a' to point to an address 4 bytes greater than 'b'. CGAC2022 Day 10: Help Santa sort presents! 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'. Find centralized, trusted content and collaborate around the technologies you use most. 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. Sometimes there are valid reasons to work with addresses as integers (e.g., dealing with alignment issues in special code). 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'. Thanks for contributing an answer to Stack Overflow! 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 How can I use a VPN to access a Russian website that is banned in the EU? 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. 1 - warning: cast from pointer to integer of different size . Want to know which application is best for the job? Was the ZX Spectrum used for number crunching? Ready to optimize your JavaScript with Rust? 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, Not the answer you're looking for? 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. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. This type has the same size of a pointer (not int) in every architecture. How can you know the sky Rose saw when the Titanic sunk? int threadnumber 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. For a new C user, I would tell them to never cast. 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). rawsocket.c:90: warning: cast to pointer from integer of different size rawsocket.c:91: warning: cast to pointer from integer of different size Alternatively the cast could be removed and the printf format changed to %p. 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. i know it's weird. the OP will also have to be careful not to do something like this in a function. 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. rev2022.12.11.43106. This is wrong, since characters are not addresses this assignment makes no sense. make: No targets provided near line 28 (CMake), gcc.exe warning cast from pointer to integer of different size [-Wpointer-to-int-cast]. Find centralized, trusted content and collaborate around the technologies you use most. 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 Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. it helps me remember. To learn more, see our tips on writing great answers. this * fetch the value stored at b+4 address & it is assigned to a which is wrong 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. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? 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 generic programming in C with void pointer. 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! Post by Jack Howarth and why it is different at -m64. If you were to use such an implementation, the program wouldn't work. Warnings are issued when the compiler compiles the code and finds something unusual that should be brought to the attention of the programmer. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? What is a smart pointer and when should I use one? In that case you should change the return type of func to intptr_t; see Using intptr_t instead of void*? What does "cast to pointer from integer of different size" mean? it helps me remember, @user1665569: Second character is stored at index 1. Connect and share knowledge within a single location that is structured and easy to search. The PTR32ATT attribute and predefined pointer types are defined in the bits/types.hheader file The second will be pointing to 0x234234. Did neanderthals need vitamin C from the diet? so just remove that & your code will work fine. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Second, did you want to put the address of line[0] into first? How to change background color of Stepper widget to transparent color? Received a 'behavior reminder' from manager. Is MethodChannel buffering messages until the other side is "connected"? How to find the size of an array (from a pointer pointing to the first element array)? The reinterpret_cast take the value and casts it to the type and size of pointer given. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? intptr_t: All this under the assumption you really want to convert the wrong-sized integer to a pointer. Thanks for contributing an answer to Stack Overflow! uboot warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] Writel(val, reg) reg = val regint Does a 120cc engine burn 120cc of fuel a minute? How to make voltage plus/minus signs bolder? All rights reserved. defines an array of characters. See GLib Type Conversion Macros for a discussion of the issue. This is on a 64-bit system. Dual EU/US Citizen entered EU on US Passport. Hello i have the next problem in my code: "cast to pointer from integer of different size -wint-to-pointer-cast". You should not try to do threading before understand basic C. I don't think is a good idea to show this. 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. (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.) 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. The best way to do this is by using the intptr_t type. i know it's weird. In this case, re-examine your expression: is that really the address of a char you're getting? 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 returning a value from a function declared to do so leads to undefined behavior. 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. When I try to compile, I get "warning: cast to pointer from integer of different size." Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. (i.e. You need to include to have the uintptr_ttype (an integral type 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. Ready to optimize your JavaScript with Rust? How to resolve this cast to pointer of a different size warning? this fixed-width integer reference. Find centralized, trusted content and collaborate around the technologies you use most. Your node just holds some pointers (ADDRESSES), it doesn't hold any VALUES. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. You're converting i to a void pointer without creating a reference to it. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? Why do quantum objects slow down when volume increases? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Linux - SoftwareThis forum is for Software issues. Asking for help, clarification, or responding to other answers. 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. Asking for help, clarification, or responding to other answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Yes, thank you! while loop keep printing and repeating, what is wrong with my getch? Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does integrating PDOS give total charge of a system? It first casts void * to uintptr_t (same size, no warning), then uintptr_t to int (number to number, no warning). 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. Solution 1 A quick hacky fix might just to cast to long instead of int. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It doesn't know that the void * is actually an int cast, so the lost bits are meaningless. This can be silenced by additionally casting func() to a suitable integer type, e.g. What does this mean, and what should I do to fix it? 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). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. warning: cast from pointer to integer of different size MacOS X 64 int I've looked at some of the previous posts on these but still cant understand why this is going on. 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. I'm assuming (char **) means it's a pointer to a pointer? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? I did this for you and get: seems like you wrote an asterisk too much. 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's a /pointer/ to StackFrame. That would be: Notice the first and second characters are at indexes 0 and 1, respectively. Here is part of a sketch and on line 142 I get a warning of a cast from integer -1, the first and second characters really aren't at those indices. as 4-byte pointers using the PTR32ATT attribute or one of the predefined 4-byte pointer types. Not the answer you're looking for? Why my own suid-ed program still holds the original uid? In that case, change func to use the uintptr_t type (defined in stdint.h). 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 does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? 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. https://www.tutorialspoint.com/cprogramming/c_pointers.htm. When printing pointers, print pointers. In the older compilers just doing the char *ptr = (char *)23 was good enough but the new The following code shows this conversion: Learn in-demand tech skills in half the time. 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. 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[]. just a typo. 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 What are the differences between a pointer variable and a reference variable? cast to pointer from integer of different size -wint-to-pointer-cast. Not sure if it was just me or something she sent to the whole team. There is a chance you are losing precision. However, be very very careful when doing things like this. is a char. cast from pointer to integer of different size when compiling on x86_64-apple-darwn9/10. Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? I'm not sure if this is what you want. 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. . and Why / when to use `intptr_t` for type-casting in C?. Envelope of x-t graph in Damped harmonic oscillations. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? 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? What is a smart pointer and when should I use one? Ergo, mismatched sizes. Can we keep alcoholic beverages indefinitely? Copyright 2022 www.appsloveworld.com. Instead you use atoi. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Irreducible representations of a product of two groups. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. That's because the thread function is declared (and specified) to return a pointer. Also note that I return a NULL at the end of the function. Not the answer you're looking for? It would also be strange because there is no cast in your code. error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast] 1 answer 10 views. Cast to pointer from integer of different size. I'm trying to create a struct that can hold generic values. Pointers have varying sizes, on 64 bit systems for example they can be expected to be 64bit. 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. What it sounds like: something is wrong in your pointers. Are the S&P 500 and Dow Jones Industrial Average securities? i actually name variables zero, first, and second. When printing pointers, print poin 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 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 uintptr_t is guaranteed to be wide enough that It is defined as follows : Integer type capable of holding a value First, if you can fix func (are allowed to modify its source), then fix it. Do bracers of armor stack with magic armor enhancements and special abilities? Notices Welcome to LinuxQuestions.org, a friendly and active Linux Community. C unix program, Different executables from different cds run always the same code, what is the time and space complexity of this function. Do non-Segwit nodes reject Segwit transactions with invalid signature? 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). What does "dereferencing" a pointer mean? Should I exit and re-enter EU with my EU passport or is it ok? How can one print a size_t variable portably using the printf family? takes the second character (line[1]) and casts it to the pointer to char, which is incorrect. pthread_join:warning: cast from pointer to integer of different size? Type-safe generic data structures in plain-old C? Why / when to use `intptr_t` for type-casting in C? 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. Note the "without a cast" part. What are the differences between a pointer variable and a reference variable? That part of the problem can be solved by using uintptr_t, a type defined in and . 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. hans April 23, 2021, 7:33pm #1. Do bracers of armor stack with magic armor enhancements and special abilities? rev2022.12.11.43106. i know it's weird, but it helped me remember the positions. Like @JonathanLeffler said, use uintptr_t. To learn more, see our tips on writing great 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 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 Concentration bounds for martingales with adaptive Gaussian steps. EDIT: To clarify, I don't want 'a' to point to an address that is 4 bytes greater than 'b'. Mathematica cannot find square roots of some matrices? 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. My gcc does not give the warning you cited. Thanks for contributing an answer to Stack Overflow! @JoshPetitt, For overcoming strict compiler warnings, the double cast may be necessary. Why does the USA not have a constitutional court? Improve INSERT-per-second performance of SQLite. Bug#622206: libomxvorbis: FTBFS on *64: cast from pointer to integer of different size. Use %p. It is designed for treating pointers as integers when necessary. ], int is only a 32-bit value, regardless of what architecture you're on. 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. cast from pointer to integer of different size [-Wpointer-to-int-cast]. Warning: cast to pointer from integer of different size. The ints would be "on the stack" and invalid once the function returns. 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). In the first case, the return value from func will lose information , and potentially 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? Data is lost upon conversion from a larger number (int) to a smaller number (pointer). This scheme is very commonly used with thread pool workers. 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? The reinterpret_cast take the value and casts it to the type and size of pointer given. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To learn more, see our tips on writing great answers. 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, Ready to optimize your JavaScript with Rust? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Second character (line[1]) is stored in the memory at address that can be retrieved by using the "address of" operator (&): &line[1]. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Counterexamples to differentiation under integral sign, revisited, Why do some airports shuffle connecting passengers through security again. thank you, i know that line[0] is the first. One reinterpret_cast fixes that. That is, nothing will be lost by the missing high 32 bits? How to fix: passing argument 1 of 'sutuntopla' makes pointer from integer without a cast warning? 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. Finally, your compiler is right in warning you. No address that func should calculate ever exceeds the maximum value of the integer type it uses? You've got lots of problems with the code you posted. MOSFET is getting very hot at high frequency PWM. If its computations can be done with pointers, then do them with pointers and return pointers. Ready to optimize your JavaScript with Rust? How do I create a static implicit rule in a Makefile? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. How to suppress warning: cast to pointer from integer of different size? 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]"? When should i use streams vs just accessing the cloud firestore once in flutter? Is it appropriate to ignore emails from a student asking obvious questions? Making statements based on opinion; back them up with references or personal experience. On a lot of systems, sizeof (long) == sizeof (void *). The possible difference in size is only part of the problem. What are the Kalman filter capabilities for the state estimation in presence of the uncertainties in the system input? I'm not even sure if this is the correct way to go about it. 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. The first one wasn't necessarily necessary. func is returning an integer that is being stored in a pointer; ptr is later cast to an integer and used as an integer. 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. - void* [] [ long long -> void* -> long long 32 ]) By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. warning: cast from pointer to integer of different size Solution:Ensure that all pointers are defined correctly. Thank you for the clarification. You need to What does "assignment makes pointer from integer without a cast" mean? ], 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). @David: See my update please, I think that's what you're after if I'm understanding you. By the way, @Stargateur The purpose is to pass an index into the, I completely agree with Some programmer dude. 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. . [3/8] exynos_fimg2d: fix cast from pointer to integer of different size Message ID [email protected] ( mailing list archive ) By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. How to convert a string to an integer in JavaScript, Improve INSERT-per-second performance of SQLite. 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. 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