Thanks for contributing an answer to Stack Overflow! Converts between types using a combination of implicit and user-defined conversions. BUT converting a pointer to void* and back again is well supported (everywhere). Thanks Jonathan, I was thinking about my answer in another thread: AraK is correct, passing integers a pointers are not necessarily interchangeable. 1. How do I check if a string represents a number (float or int)? Even though what you say regarding the lifetime of the object is true, integral types are too limited for a generic API. There's no proper way to cast this to int in general case. how to cascade 2d int array to 2d void pointer array? Returns a value of type new-type. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, "what happen when typcating normal variable to void* or any pointer variable?" Please help me compile Chez Scheme. for (i=0, j=0; j should be the correct one. "-I.." "-Iinclude\openflow" "-I..\include\openflow" "-Iinclude\openvswitch" "-I..\include\openvsw If this is the data to a thread procedure, then you quite commonly want to pass by value. Visit Microsoft Q&A to post new questions. You can convert the values from one type to another explicitly using the cast operator as follows (type_name) expression 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. Evaluate integer expressions in a larger size before comparing or assigning to that size.Note that (time_+t)-1 also complies with INT31-C-EX3. 471,961 Members | 900 Online. You can only do this if you use a synchronization primitive to ensure that there is no race condition. 10) A prvalue of type pointer to void (possibly cv-qualified) can be converted to pointer to any object type. I recall there was a TreeNode(int) early on prior to 1.0 release I can't remember why I removed it, if I should felt it was easy enough to cast to (void*) or if it was because it created type inference conflict at the call site. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? SCAN_PUT_ATTR(mask, ATTR, smask, FUNC); SQL Server does not automatically promote . x is a local variable and its lifetime ends as soon as control leaves the scope it was defined in. rev2023.3.3.43278. ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] The correct answer is, if one does not mind losing data precision. RNINGS" "-D_CRT_SECURE_NO_DEPRECATE" -MD -MQ lib/libopenvswitch.a.p/odp-util.c.obj -MF "lib\libopenvswitch.a.p\odp-util.c.obj.d" -o lib/libopenvswitch.a.p/od But assuming that it is, as long as the caller and the callee agree, you can do that sort of thing. You cannot just cast the 32-bit variable to a pointer, because that pointer on a 64-bit machine is twice as long. A pointer converted to an integer of sufficient size and back to the same pointer type is guaranteed to have its original value, otherwise the resulting pointer cannot be dereferenced safely ( the round-trip conversion in the opposite direction is not guaranteed [.]) Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. The main point is: a pointer has a platform dependent size. I have a two functions, one that returns an int, and one that takes a const void* as an argument. 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. For a fairly recent compiler (that supports C99) you should not store or represent address as plain int value. 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. p-util.c.obj "-c" ../lib/odp-util.c If you preorder a special airline meal (e.g. Connect and share knowledge within a single location that is structured and easy to search. This page was last modified on 12 February 2023, at 18:25. Thanks for contributing an answer to Stack Overflow! The program can be set in such a way to ask the user to inform the type of data and . What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? I am an entry level C programmer. Actions. Maybe you can try this too. ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ windows meson: cast to smaller integer type 'unsigned long' from 'void *'. For the second example you can make sure that sizeof (int) <= sizeof (void *) by using a static_assert -- this way at least you'll get a notice about it. Keep in mind that thrArg should exist till the myFcn() uses it. Here is some piece of code where that error occur: /cocos2d-x-2.2.2/cocos2dx/platform/ios/EAGLView.mm:408:18: Cast from pointer to smaller type 'int' loses information. vegan) just to try it, does this inconvenience the caterers and staff? Then I build my project, I get the error "Cast from pointer to smaller type 'int' loses information" in EAGLView.mm file (line 408) when 64-bit simulators (e.g. 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;. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy.