The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. { Can you please explain it with suitable example. Im using Ubuntu with G++ installed. It is a valid use case to cast things from void* to integer types if you have a generic function that takes (void *) because the a user can pass their own data which may be a pointer or an integer into it. However there were several warning messages that kick out. We are migrating our c-code to 10.2.0.3.0. But you seem to suggest by your answer that the user can pass 5 to pthread_create and then perform the above cast to get it back. How to cast an int unique_ptr into a void unique_ptr? testhandlerint4 At what point in the prequels is it revealed that Palpatine is Darth Sidious? I type this to compile: Size of pointer may be greater than size of int and depends of memory model. This allows you to reinterpret the void * as an int. +1 for referencing intptr_t. The 32 remaining bits stored inside int are insufficient to reconstruct a pointer to the thread function. Like it or not, English is the predominant language for programming and you make live easier for any non-hispanophone We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. To learn more, see our tips on writing great answers. Again, all of the answers above missed the point badly. On your platform, a pointer does not fit in an int. public: Why cast a float to an integer? You could use this code, and it would do the same thing as casting ptr to (char*) returnPtr [j] = Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? 5() But that doesn't change the fact that this. c++ error when converting from hex string to int. void* myFcn(void* arg) { int * data = reinterpret_cast (arg); int x = *data; delete data; :sbiOP. C99 standard library provides intptr_t and uintptr_t typedefs, which are supposed to be used whenever the need to perform such a cast comes about. Making statements based on opinion; back them up with references or personal experience. If you call your thread creation function like this, then the void* arriving inside of myFcn has the value of the int you put into it. The error has nothing to do with the makefile. class base cast from jobject to jboolean loses precision, C++ typecast: cast a pointer from void pointer to class pointer. this question. Hi guys linux c-pthreads: problem with local variables. @jogjopan: What is said by you is perfectly right. How do I work around the GCC "error: cast from SourceLocation* to int loses precision" error when compiling cmockery.c? Well it does this because you are converting a 64 bits pointer to an 32 bits integer so you loose information. printf("%d",c); Man Pages, All hi, You can't just cast a string to a numeric type - C just doesn't work that way. What you should do is modify any int that can hold a pointer to intptr_t. If those types are not available, size_t or ptrdiff_t are also large enough to hold a pointer on most (not all) platforms. {cout<<"from der\n";} # I have used My question is simple: When should I use a long, int, char, unsigned/signed variables?? What I am saying is that you shouldn't convert 64-bit pointers to 32-bit integers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The bug is in the source, on the line shown by the error. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? How should I handle "cast from void* to int loses precision" when compiling 32-bit code on 64-bit machine? Compile error: cast from void* to int loses precision [-fpermissive] While compiling the current HEAD (17b63fda) on Linux, I receive an error while compiling wx-podule { Why would I delcare an integer "long" or "short" ( unsigned or signed)?? { Any examples of when things like "unsigned", "long", "short" etc Hi guys unsigned int b=10; I see there may be other reasons. Andrey Karpov. Instead of using a long cast, you should cast to size_t. Man Pages, All For C++ I'd normally advise using C++ I/O with the << operator (and for pointers you have to be careful with char*, which has an overload treating it as a pointer to a string), but that might not be available in this case. #include C++ deleting children basing on parent's pointer, Sending files over TCP sockets C++ | Windows. In my case, I was using a 32-bit value that needed to be passed to an OpenGL function as a void * representing an offset into a buffer. If you see the "cross", you're on the right track. In the United States, must state courts follow rulings by federal courts of appeals? This returns the first 32 bits of the pointer which may be the top or the bottom depending on big versus little endian, as comment #2 said. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. if, so how can I printf it to stdout? ), For those who are interested. The programs compiled clean. Casting a pointer to void* and back is valid use of reinterpret_cast<>. make install Suppressing the warnings are a bad idea, but there may be a compiler flag to use 64-bit ints, depending on your compiler and architecture, and this is a safe way to fix the problem (assuming of course that the code didn't also assume ints are 32-bit). C++ typecast: cast a pointer from void pointer to class pointer; srand (time (null)) causes compiler warning: implicit conversion loses integer precision; Why does Visual C++ warn on implicit cast from const void ** to void * in C, but not in C++? int c1; Some platforms will have an intptr_t, but this is not a standard feature of C++. Copyright 2022 www.appsloveworld.com. Aug 27, 2016 at 9:39am. You think by casting it here that you are avoiding the problem! Why would I delcare an integer "long" or "short" ( unsigned or signed)?? char d1; How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? The mapping in pointer<->integer casts is implementation defined, but the intent was that if the pointer type is large enough and isn't forcefully aligned (, But that's different. Discussion at stackoverflow.com. }. Thanks for contributing an answer to Stack Overflow! Undefined behavior of constexpr static cast from int to scoped enum with non-fixed underlying type compiles in C++17, retrieving int value from void sub function to function in C++, Compile error : cast void * failed in C/C++. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? d=dynamic_cast(b); Connect and share knowledge within a single location that is structured and easy to search. If the reason for the cast is to do pointer arithmetic with byte granularity, then the best way is probably to cast to a (char const *) and do the math with that. How many transistors at minimum do you need to build a general-purpose computer? Do bracers of armor stack with magic armor enhancements and special abilities? }; But the base *b=new derv; It's an int type guaranteed to be big enough to contain a pointer. if( (. fileDescriptor = What does the warning message 724 "Cast converts default int return type to." is int64_t or u_int64_t what I need ? Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? He should pass the address of the integer, the thread should get that address, Note: This is only appropriate is you cast the. But once you get an address > 4GB, your code will start 'mysteriously' not working. If your code has the chance to ever be ported to some platform where this doesn't hold, this won't work. Hi, 1*pa*p, qq_38690888: fileDescriptor = Hi, This is not a conversion at all. Keep in mind that thrArg should exist till the myFcn() uses it. If you convert ( void*) to ( long) no precision is lost, then by assigning the ( long) to an ( int ), it properly Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Where does the idea of selling dragon parts come from? Is it safe to delete a pointer that was cast from void in C++? For example: You will get an error: cast from char* to int loses precision [-fpermissive]. Devesh. using namespace std; @Wexxor: No, the point is that the a pointer has a different size than an. There is absolutely not gurantee that sizeof(int) <= sizeof(void*). Should my function return a pointer to std::vector, or a reference to std::vector? Find centralized, trusted content and collaborate around the technologies you use most. Your code is broken. }; Definitely don't cast pointers to ints in any of your new code, though. "No appropriate default constructor available"--Why is the default constructor even called? How to get the error message from the error code returned by GetLastError()? The correct answer is, if one does not mind losing data precision. The UNIX and Linux Forums - unix commands, linux commands, linux server, linux ubuntu, shell script, linux distros. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). {cout<<"from base\n";} Because the system I compiled is linux64-bit, the pointer type and the long type are equal in size (8B) and the int type is 4B, so there will be: lost precision. About size_t and ptrdiff_t. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? int main() { int* pi = const_cast(&CA::i); Asking for help, clarification, or responding to other answers. int b1; int is not, and converting a pointer to int can easily lose information. I want to create a file with permissions for read, write, and execute to everybody using C, so I write this code: . It seems you have a definition of size_t that is incorrect, you should fix it. Or stay on the 32-bit platform that the code currently works on. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. https://bbs.csdn.net/topics/603958740 Casting a pointer to an int is horrible from a portability perspective. This is flat out wrong. using namespace std; do This will get you a pointer from a 32 bit offset: A function pointer is incompatible to void* (and any other non function pointer). In the best case this will give the same results as the original code, with no advantages, but in the worst case it will fail in multiple catastrophic ways (type punning, endianness, less efficient, etc. What you're actually casting is the address in memory that the string resides at.. https://bbs.csdn.net/topics/603958740 cast from const void* to unsigned int loses precision. There are ways to prevent this: pass a dynamic allocated argument if your not the passing thread is not static or if your argument is a local variable, otherwise there is no issue. unsigned int c; b->disp(); At what point in the prequels is it revealed that Palpatine is Darth Sidious? Why does Visual C++ warn on implicit cast from const void ** to void * in C, but not in C++? Hello everey one, here i am attempting to compile a c++ project .it's throughing the following errors. Pointer packing. Any examples of when things like "unsigned", "long", "short" etc Hi, 5() All rights reserved. I know that is unsafe and one must consider his/her logic before thinking of it. int x = (int)arg; use: int x = (long)arg; On most platforms pointers and longs are the same size, but ints and pointers often are not the same size on 64bit platforms. public: Actually, it's only likely to work well if it's in the first 2G - from 2~4G sign extension will get you :). But the usual way to print a pointer address with printf is to pass the pointer as void* and use the %p format specifier. If you do this, you have the thread reference a value that (hopefully still) lives in some other thread. Can any one tell me why my following program is crashing? Making statements based on opinion; back them up with references or personal experience. }; On 32-bit systems, ints and pointers are both four bytes, so the cast works even though it is bad form. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). How can i get the What is the difference between int** func() and int*& func(). # sign.sh The best answer is still to fix the code, I suppose, but if it's legacy third-party code and these warnings are rampant, I can't see this refactoring as being a very efficient use of your time. Suppressing the warnings are a bad idea, but there may be a compiler flag to use 64-bit ints, depending on your compiler and architecture, and th Change jdk path in IntelliJ 13 when compiling from 32 bit program file folder to 64 bit one, Ignore [clang-diagnostic-error] clang-tidy caused by 3rd party headers, c++: cast from "const variable*" to "uint32" loses precision. static const int in switch statement from another class cause error C2051: case expression not constant, Explicit cast from int to a user defined class, c++, error while trying to get the int from a string, Calling a Derived Class method from a Void Pointer cast to a Base Object. # Unsign to sign int fileDescriptor; I provide the solution if there is a dire need to cast pointer into integer. The OP wanted to convert a pointer value to a int value, instead, most the answers, one way or the other, tried to wrongly convert the content of arg points to to a int value. This is an old C callback mechanism so you can't change that. Reinterpret cast from pointer to integer is defined only in the case where the integer can represent all of the Better way to check if an element only exists in one array. The rubber protection cover does not pass through the hole in the rim. Do bracers of armor stack with magic armor enhancements and special abilities? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Why is cast from X* to Y loses precision a hard error and what is suitable fix for legacy code, error: cast from 'void*' to 'int' loses precision, Missing include "bits/c++config.h" when cross compiling 64 bit program on 32 bit in Ubuntu. The example piece code below works perfectly except {cout<<"from base\n";} If I set backlog to 128, is it means no more than 128 packets can be handled by server? Casting from pointer to any data maybe useful in user-defined callbacks. The problem has nothing to do with your Makefile; it's an error in your C++ source code. Handle int listen(int sockfd, int backlog) in TCP, C++ program is crashing on re-assigning const static member variable using an int pointer, Help with understanding ( int, char, long, short, signed, unsigned etc. ). The example piece code below works perfectly except Would salt mines, lakes or flats be reasonably found in high, snowy elevations? Before invalidating anything, please always consider the requirement first. As defined by the current C++ standard, there is no integer type which is guaranteed to hold a pointer. The issue is that, in 32bits, an int (which is a 32bit integer) will hold a pointer value. When you move to 64bit, you can no longer store a poin How to get duration, as int milli's and float seconds from ? I agree passing a dynamically allocated pointer is fine (and I think the best way). Better way to check if an element only exists in one array. A WORD is 16 bits, and a size_t is usually 32 or 64 bits depending on the compiler options, the same size as a pointer with the same options. . They're not god's law engraved in stone, and treating like they are isn't helping. If you cast a pointer to an integer, you should probably use intptr_t or uintptr_t from stdint.h which are guaranteed to be big enough. Casting a pointer to an int is horrible from a portability perspective. The size of int is defined by the mix of compiler and architecture. This is What I am saying is that it would be safer to use new(5) rather than 5 and deal with it appropriately at the other end. Therefore: first Is this an at-all realistic configuration for a DHC-2 Beaver? Why is reading lines from stdin much slower in C++ than Python? testhandlerint46484int8handler84int64l : Something can be done or not a fit? my machine details are How does the Chameleon's Arcane/Divine focus interact with magic item crafting? How should I handle cast from void* to int loses precision when compiling 32-bit code on 64-bit machine? const int CA::i = 10; When it is cast to an integer (int)OriginalChar the result is the address of the array, as an int. Explanation . The size of int is defined by the mix of compiler and architecture. Thanks, So, solution #3 works just fine. }; How is the merkle root verified if the mempools may be different? #include How do I dynamically cast from a void * pointer generically? Making statements based on opinion; back them up with references or personal experience. rev2022.12.9.43105. Does the collective noun "parliament of owls" originate in "parliament of fowls"? Not the answer you're looking for? The meaning of the sentence is from void* to int conversion loss Precision, I believe see explanation some people understand, This problem only occurs on Linux with the X64 bit, because the pointer occupies 8 bytes on a 64-bit machine, and int occupies four bytes, so this problem occurs. If he had met some scary fish, he would immediately return to the surface. return(0); What is the difference between int** func() and int*& func(). You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. class base You'd be better off casting to a uintptr_t or intptr_t (from stdint.h, and choose the one that best matches the signedness you need). The code needs to be changed and reviewed for 64bit compatibility. Where does the idea of selling dragon parts come from? -1, Uggh. Error: cast from void* to int loses precision. The best way is, if one can, do not do such casting, instead, if the same memory address has to be shared for pointer and int (e.g. void disp() Counterexamples to differentiation under integral sign, revisited. const static int i; for saving RAM), use union, and make sure, if the mem address is treated as an int only if you know it was last set as an int. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? You need to pass an actual pointer. Devesh. int i; i = (int)(tulong)ptr; I think, the problem is of typecasting a pointer to a shorter data type. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Easiest way to convert int to string in C++. So you could do this: Note: As sbi points out this would require a change on the OP call to create the thread. { Is Most answers just try to extract 32 useless bits out of the argument. public: Did neanderthals need vitamin C from the diet? What I am trying to emphasis that conversion from int to pointer and back again can be frough with problems as you move from platform to platform. https://www.cnblogs.com/wajika/p/6516379.html, : If the sizes are different then endianess comes into play. Sometimes it is sensible to want to split up a 64-bit item into 2 32-bit items. Infact I know several systems where that does not hold. char *ptr; // Int argument passed from C to Assembly loses its sign; What happens when a int list is cast as a char list in C? #include It has a parameter called backlog and it limits the maximum length of queue of pending list. Insertion will be allowed, but accessing or searching may be problematic due to compilation error. int main() { This detail is the reason why the conversion isn't allowed. That's perfectly fine. Asking for help, clarification, or responding to other answers. int. Windows has 32 bit long only on 64 bit as well. Ready to optimize your JavaScript with Rust? My question is simple: When should I use a long, int, char, unsigned/signed variables?? Do non-Segwit nodes reject Segwit transactions with invalid signature? If you convert (void*) to (long) no precision is lost, then by assigning the (long) to an (int), it properly truncates the number to fit. Please help me with the following code to get the difference in values. { Are the S&P 500 and Dow Jones Industrial Average securities? That could create all kinds of trouble. cannot convert argument 1 from int to int && error. error: cast from 'void*' to 'int' loses precision. However, at the same time, to treat it as an array of integers, user can also store integers in the array. I am sorry, but this is not a valid solution. I would create a structure and pass that as void* to pthread_create. virtual void disp() I want to create a file with permissions for read, write, and execute to everybody using C, so I write this code: Is there a higher analog of "category with all same side inverses is a groupoid"? fix cast from void* to Gluint 8a04369 gcc complained OsvrRenderingPlugin.cpp:788:44: error: cast from 'void*' to 'GLuint {aka unsigned int}' loses precision [-fpermissive] If your standard library (even if it is not C99) happens to provide these types - use them. This means you. [1/1] Cythonizing thinc/api.pyx Compiling thinc/features.pyx Examples of frauds discovered because someone tried to mimic a random sequence. Half your pointer will be garbage. Why doesn't my cast from enum to int work in release builds? Therefore, you need to change it to long long instead of long in windows for 64 bits. Why does a C/C++ program often have optimization turned off in debug mode? Why is cast from X* to Y loses precision a hard error and what is suitable fix for legacy code. So you know you can cast it back like this. tell me. VSVShttps://docs.microsoft.com/zh-cn/visualstudio/ide/?view=vs-2022, xingblog: So reinterpret_cast has casted it to long type and then static_cast safely casts long to int, if you are ready do truncte the data. How could my characters be tricked into thinking they are on Mars? It has a parameter called backlog and it limits the maximum length of queue of pending list. I just came across some code doing the same thing - yeah, its not great but needed a solution to get it compiling on 64 bit machines - thanks for the heads-up! I don't know what TThread::Printf is, it's not standard. #/bin/bash @jogojapan: You are right. c = b - (unsigned int )sizeof(a); From the question I presume the OP does. How do you exit from a void function in C++? Is it appropriate to ignore emails from a student asking obvious questions? You do not want to suppress these errors because most likely, they are indicating a problem with the code logic. main() is int64_t or u_int64_t what I need ? } Ready to optimize your JavaScript with Rust? If I have three hello everybody! The correct way to print a pointer value in C is to use the %p specifier, which requires an argument of type void*: ptr apparently is already of type void*, so the cast isn't necessary, but it's needed for other pointer types. Received a 'behavior reminder' from manager. mHandle should not be a WORD - this is completely wrong. The most prominent warning is: hi, I am new to C. (used it some in college). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please tell me We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. But for a larger type to int, it works fine. #/bin/bash If you cast a pointer to an integer, you should probably use intptr_t or uintptr_t from stdint.h which are guaranteed to be big enough. You can try to use intptr_t for best portability instead of int where pointer casts are required, such as callbacks. There is no "correct" way to store a 64-bit pointer in an 32-bit integer. This is not even remotely "the correct answer". { long guarantees a pointer size on Linux on any machine. We are migrating our c-code to 10.2.0.3.0. If the latter, then you need to 'downcast' that pointer back to an integer. Why is apparent power not measured in watts? I can't imagine many cases where that is the correct thing to do, or where it won't cause errors. Casting arguments inside the function is a lot safer. 8 seconds for regex_match("", regex(".{40000}"));? Japanese girlfriend visiting me in Canada - questions at border control? On a slightly related note, embedding Python is not a suitable beginner's project. Is energy "equal" to the curvature of spacetime? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How long does SHA-1 take to create hashes? How can I remove a key from a Python dictionary? What you do here is undefined behavior, and undefined behavior of very practical sort. But there be some circumstances where one can safely downcast pointer (e.g. D:\\Dev\\3rdparty\\thinc>python setup.py build_ext --inplace Compiling thinc/api.pyx because it changed. While the pointer points to an address in the first 4 GB, the upper 32 bits will be 0 and you won't lose any data. Add a new light switch in line with another switch? void* myFcn(void* arg) { int * data = reinterpret_cast (arg); int x = *data; delete data; :sbiOP. int b1; Package: vlc Version: 0.8.4-svn20050810-1 Severity: serious Hi, Your package is failing to build on 64 bit arches with the following error: g++ -DHAVE_CONFIG_H -I. What is the maximum size of the map object in c++ and java? virtual void disp() error: cast from void* to int loses precision. It's an error for a reason: int is only half as big as void* on your machine, so you can't just store a void* in an int. Is it safe to cast to int from std::round? Fix your code. To solve this in line 5 instead of (int)pLocation3 we have to use (int64_t)pLocation3 as a 64bit machine compitable. Connect and share knowledge within a single location that is structured and easy to search. C++ how to get the address stored in a void pointer? void disp() Asking for help, clarification, or responding to other answers. Not the answer you're looking for? warning: cast from void* to int loses precision [-fpermissive] warning:implicit conversion loses integer precision:int to unsigned short -- C integer promotion cast from pointer to smaller type int loses information NDK He's down-casting, this is commonly used when you need to pass either a bunch of data via a pointer, or just an integer argument. And, most of these will not even work on gcc4. There's no proper way to cast this to int in general case. #include And how to get the value they. The issue is that, in 32bits, an int (which is a 32bit integer) will hold a pointer value. I am still in the search of a compiler option in GCC/Clang. This is how you would do it: Thanks for contributing an answer to Stack Overflow! Since 32 and 64 are both greater than 16, the compiler is complaining and rightly so. Yes, the code is not 64-bit clean. d->disp(); To respond: What I am saying is not that you shouldn't convert pointers to integers. { This assumes that TThread::Printf works like printf; given the name it certainly should, but it's not guarantee. this way I convert an int to a void* which is much better than converting a void* to an int. Terrible solution. Should this static cast from int to double be avoided? As was pointed out by Martin, this presumes that sizeof(void*)>=sizeof(int). derv *d; Rvalue Reference is Treated as an Lvalue? Fortunately, you've shown us the line with the error. from the manual When I declare a variable "unsigned;" what did I do it??? It won't become any less broken by ignoring the warnings the compiler gives you. How can i get the What does the warning message 724 "Cast converts default int return type to." The OP tried this directly, and your answer still does it, except that it converts to 64-bit integer first, and then to 32-bit integer. Add a new light switch in line with another switch? I personally upvoted this answer because by it's first line of text it helped me to understand the reason of this strange error message and what am I, poor idiot, doing :D. Not valid on Windows 64 - long is still 32-bit but pointers are 64-bit. main() You guys are all missing the point. from the manual I would guess it's because you are making your variables "unsigned int", when they should be "unsigned char". eg. Or use long (is typically 64-bit on 64-bit platforms on the GCC compiler) or long long (a C99 types which most, but not all compilers, support in C++), or some other implementation-defined integral type that is at least 64 bits wide on a 64-bit platform. But I have a suggestion to bypass the compiler. Cast from void* to int; Andrey Karpov, Evgeniy Ryzhkov. I solved it in the following way: I think, the problem is of typecasting a pointer to a shorter data type. Real-world advantage of namespace aliases vs defines, C++ expected primary-expression before "int", generating random numbers in C++ using TR1 /dev/random (resilient to <1 second runs). while true Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You should be doing int x = *((int *)arg); You are casting from void * to int that is why you get the warning. Discussion at bytes.com. Please help me with the following code to get the difference in values. You do not want to suppress these errors because most likely, they are indicating a problem with the code logic. If you suppresses the errors, this And you can't pass a pointer to a stack based object from the other thread as it may no longer be valid. }; derv *d; I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread. Why does the USA not have a constitutional court? How can I randomly select an item from a list? If you suppresses the errors, this could even work for a while. Something else about the call, typically another argument, tells the function if the pointer argument is actually a pointer to some data, or just an integer that has been 'upcast' to a pointer. Last Activity: 1 September 2009, 9:07 AM EDT. int main() cast from const void* to unsigned int loses precision. 1. Is there a higher analog of "category with all same side inverses is a groupoid"? difference between two pointers). class derv : public base my solution is using "long long" instead of "int". *pi = 9; d=dynamic_cast(b); int open(const char *pathname, int flags, mode_t mode) doubt Help - Cast converts default int return type, to get the correct value with unsigned int, difference between int ** func() and int *& func(). int main() class CA { That's not a good idea if the original object (that was cast to void*) was an integer. Thus as a result it may be less error prone to generate a pointer dynamcially and use that. A typedef might make this a little nicer in the code. Your code is broken. It won't become any less broken by ignoring the warnings the compiler gives you. What do you think will happen when you try The meaning of the sentence is from void* to int conversion loss Precision, I believe see explanation some people understand, This problem only occurs on Linux with the X64 bit, even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. You have to manually edit those files in order to replace them with code that isn't likely to be buggy and nonportable. #include struct a{ It's an error for a reason: int is only half as big as void* on your machine, so you can't just store a void* in an int . You would loose ha There is an option to let the Can any one tell me why my following program is crashing? For a 64bit machine, it's tricky to cast an int pointer(hex format) to int value or char pointer to int value because each block of memory for an int variable is 32 bit and for char it's 8 bit. Pattern 7. Something can be done or not a fit? What is the POINTER_32 macro? Test.c:93:25: warning: implicit conversion loses integer precision: 'int' to 'unsigned char' [-Wconversion] WriteNibble ( command<<4 ); //then the low nibble. Login or Register to Ask a Question and Join Our Community, Login to Discuss or Reply to this Discussion in Our Community, All UNIX cout << CA::i << endl; Get the address of a callback function to call dynamically in C++, error: call of overloaded function ambiguous, error: cast from to unsigned int loses precision [-fpermissive]. int main(){ if, so how can I printf it to stdout? } I don't know what TThread::Printf is, it's not standard. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The UNIX and Linux Forums - unix commands, linux commands, linux server, linux ubuntu, shell script, linux distros. tell me. Partitioning/batch/chunk a container into equal sized pieces using std algorithms. You will get an error: cast from char* to int loses precision [-fpermissive] To solve this in line 5 instead of (int)pLocation3 we have to use (int64_t)pLocation3 as a 64bit machine testhandlerint4. How can I store and/or print() a number that is larger than 4 294 967 295 in C? You first convert to an integer type large enough to hold the pointer, and then you narrow it anyway. Is energy "equal" to the curvature of spacetime? Linux Man Pages, cast from const void* to unsigned int loses precision, difference between int ** func() and int *& func(), to get the correct value with unsigned int, Help - Cast converts default int return type. CGAC2022 Day 10: Help Santa sort presents! while true Then in such case, user can use void pointers to store any object. int fileDescriptor; class derv : public base #include Remembering to delete the pointer after use so that we don't leak. 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