LLNL's tutorial is bad and they should feel bad. There's probably little you can do except look or hope for a fixed 2.x version or upgrade to 3.x (I would assume it's 64-bit safe but this is just a guess, do research this issue before you upgrade). Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. cast to 'double *' from smaller integer type 'unsigned int' The C compiler is gcc, clang version 3.9.1, target aarch64--linux-android, thread model posix. Type casting is when you assign a value of one primitive data type to another type. You use the address-of operator & to do that int x = 10; void *pointer = &x; And in the function you get the value of the pointer by using the dereference operator *: int y = * ( (int *) pointer); Share Improve this answer Follow edited Apr 15, 2013 at 13:58 answered Apr 15, 2013 at 13:53 Some programmer dude 394k 35 393 602 1 void* -> integer -> void* rather than integer -> void* -> integer. C/C++ , Cerror: cast to 'void *' from smaller integer type 'int'. Half your pointer will be garbage. Did i have to face to unexpected runtime issues, i guess not, i've found another discussion on this -. You can use any other pointer, or you can use (size_t), which is 64 bits. This is known as implicit type casting or type promotion, compiler automatically converts smaller data type to larger data type. Put your define inside a bracket: #define M_TABLE_SIZE (64*1024) Now, you can do: static const void* M_OFFSET = (void*) M_TABLE_SIZE; without a problem. Not the answer you're looking for? Note that it's not guaranteed that casting an, Generally this kind of type casting does not lead to any concern as long as the addresses are encoded using the same length as the "variable type" (. Disconnect between goals and daily tasksIs it me, or the industry? "because the type "int" supports only -32768 ~ 32768" This is not true for any modern desktop or mobile OS or any OS that is targeted by cocos2d-x. Casting an open pointer to other pointer types and casting other pointer types to an open pointer does not result in a compile time error. The following program casts a double to an int. If the function had the correct signature you would not need to cast it explicitly. Converting a void* to an int is non-portable way that may work or may not! Properly casting a `void*` to an integer in C++ 24,193 Solution 1 I think using intptr_t is the correct intermediate here, since it's guaranteed to be large enough to contain the integral value of the void*, and once I have an integer value I can then truncate it without causing the compiler to complain. Before I update Xcode, my project still can build and run normally with all devices. Number Type Cast | Qt Forum The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. You are getting warnings due to casting a void* to a type of a different size. FAILED: lib/libopenvswitch.a.p/odp-util.c.obj Use returnPtr[j] = (void *) ((long)ptr + i); ). But assuming that it is, as long as the caller and the callee agree, you can do that sort of thing. Mutually exclusive execution using std::atomic? I'm trying to create a void* from an int. Fork 63. pthread create managing values generated in function (in c), Establishing TCP socket connection between PHP client and C server on Ubuntu. For example, if youwrite ((int*)ptr + 1), it will add 4 bytes to the pointer, because "ints" are 4 bytes each. Otherwise, if the original pointer value points to an object a, and there is an object b of the . 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]. Functions return bigint only if the parameter expression is a bigint data type. 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. From that point on, you are dealing with 32 bits. This will only compile if the destination type is long enough. you can pass the int value as void pointer like (void *)&n where n is integer, and in the function accept void pointer as parameter like void foo(void *n);and finally inside the function convert void pointer to int like, int num = *(int *)n;. property that any valid pointer to void can be converted to this type, Please tell me error: cast from 'void*' to 'int' loses precision, How Intuit democratizes AI development across teams through reusability. @Artelius: Which, presumably, is exactly what Joshua did: A C++ reinterpret cast will not solve the problem. How to correctly type cast (void*)? - social.msdn.microsoft.com what does it mean to convert int to void* or vice versa? We have to pass address of the variable to the function because in function definition argument is pointer variable. How do I check if a string represents a number (float or int)? I have the following function and when I compile it under VS.NET 2005, the following compile warnings show up: Warning1warning C4311: 'type cast' : pointer truncation from 'void *' to 'long'c:\temp\testone\lib\utils.c56Warning2warning C4312: 'type cast' : conversion from 'unsigned long' to 'void *' of greater sizec:\temp\testone\lib\utils.c56, Code Snippet Apparently the clang version in Xcode 5.1 and above is more strict about potential 32bit vs. 64 bit incompatibilities in source code than older clang versions have been. this way you won't get any warning. rev2023.3.3.43278. You are just making it bigger by tricking the compiler and the ABI. static_cast conversion - cppreference.com Bulk update symbol size units from mm to map units in rule-based symbology. (i.e. Is it possible to create a concave light? This forum has migrated to Microsoft Q&A. You could use this code, and it would do the same thing as casting ptr to (char*). As with all cast expressions, the result is: Two objects a and b are pointer-interconvertible if: static_cast may also be used to disambiguate function overloads by performing a function-to-pointer conversion to specific type, as in. @Xax: Here's a fixed version, without the race condition: gist.github.com/depp/241d6f839b799042c409, gist.github.com/depp/3f04508a88a114734195, How Intuit democratizes AI development across teams through reusability. Well occasionally send you account related emails. If the value is ever used as pointer again that will prove to be an extremely bad idea. rev2023.3.3.43278. privacy statement. ncdu: What's going on with this second size column? Casting Pointers - IBM A nit: in your version, the cast to void * is unnecessary. The problem just occur with Xcode 5.1. use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD). Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). Whats the grammar of "For those whose stories they are"? Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Asking for help, clarification, or responding to other answers. Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). Star 675. : iPhone Retina 4-inch 64-bit) is selected. error: cast from pointer to smaller type 'unsigned int' loses information. You use the address-of operator & to do that. I have looked around and can't seem to find any information on how to do this. You are correct, but cocos actually only uses that address as a unique id. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ERROR: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int', error: cast to 'string' (aka 'char *') from smaller integer type 'int' [-Werror,-Wint-to-pointer-cast], error: incompatible integer to pointer conversion assigning to 'string' (aka 'char *') from 'int' C, warning: initialization of 'unsigned char' from 'uint8_t *' {aka 'unsigned char *'} makes integer from pointer without a cast [-Wint-conversion], Minimising the environmental effects of my dyson brain. Find centralized, trusted content and collaborate around the technologies you use most. /** Dynamically allocate a 2d (x*y) array of elements of size _size_ bytes. Why does flowing off the end of a non-void function without returning a value not produce a compiler error? error: cast from 'void*' to 'int' loses precision - Stack Overflow *sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller integer type 'enum aic32x4_type' from 'void *' @ 2022-04-22 9:48 kernel test robot 0 siblings, 0 . But then you need to cast your arguments inside your thread function which is quite unsafe cf. B programing language is a language based on basic combined programming or a BCPL, and it is the precursor of the C programming language. actually no, as int my be a smaller type than a pointer ;-) But, of course with int64_t it works fine. If you write ((char*)ptr + 1), it will advance the pointer 1 byte, because a "char" is 1 byte. For example, the main thread could wait for all of the other threads to end before terminating. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Using an integer address (like &x) is probably wrong, indeed each modification you will execute on x will affect the pass behaviour. Terrible solution. BUT converting a pointer to void* and back again is well supported (everywhere). Wrong. Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. } SCAN_END_SINGLE(ATTR) How to correctly cast a pointer to int in a 64-bit application? Java Type Casting (With Examples) - Programiz /** Dynamically allocate a 2d (x*y) array of elements of size _size_ bytes. Narrowing Casting (manually) - converting a larger type to a . ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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