I don't see how anything bad can happen . ", "!"? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The proper way is to cast it to another pointer type. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Does Counterspell prevent from any further spells being cast on a given turn? 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. The dynamic_cast<>operator provides a way to check the actual type of a pointer to a polymorphic class. On all of them int is 32bit, not 16bit. (Also, check out how it prints "5" twice), passing a unique pointer to each thread wont race, and you can get/save any kind of information in the th struct. I get the error: "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0), How Intuit democratizes AI development across teams through reusability. static const void* M_OFFSET = (void*)64*1024; Since gcc compiles that you are performing arithmetic between void* and an int ( 1024 ). But the problem has still happened. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. what does it mean to convert int to void* or vice versa? Share Improve this answer Follow answered May 6, 2018 at 7:24 Rahul Pull requests. The value of float variable is= 37.75. Connect and share knowledge within a single location that is structured and easy to search. 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. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? SCAN_SINGLE("skb_priority(", uint32_t, u32, OVS_KEY_ATTR_PRIORITY); Getting Command /bin/sh failed with exit code 65 Error with Xcode 5.1 . long guarantees a pointer size on Linux on any machine. byte -> short -> char -> int -> long -> float -> double. If the original pointer value represents an address of a byte in memory that does not satisfy the alignment requirement of the target type, then the resulting pointer value is unspecified. Bulk update symbol size units from mm to map units in rule-based symbology. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Alternatively, if you choose to castthe ptr variableto (size_t) instead, then you don't need to worry about the pointer typeanymore. 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. Infact I know several systems where that does not hold. : iPhone Retina 4-inch 64-bit) is selected. For integer casts in specific, using into() signals that . property that any valid pointer to void can be converted to this type, Does Counterspell prevent from any further spells being cast on a given turn? The text was updated successfully, but these errors were encountered: You signed in with another tab or window. If any, how can the original function works without errors if we just ignore the warning. Typically, long or unsigned long is . You can fix this error by replacing this line of code. ), For those who are interested. If the value in a pointer is cast to a different type and it does not have the correct alignment for the new type, the behavior is undefined. I have a function with prototype void* myFcn(void* arg) which is used as the starting point for a pthread. Surely the solution is to change the type of ids from int to type that is sufficiently large to hold a pointer. [that could be a TODO - not to delay solving the ICE]. You are correct, but cocos actually only uses that address as a unique id. Connect and share knowledge within a single location that is structured and easy to search. The pointer doesn't actually point to anything, but it's the result of an earlier cast from an integer to a pointer (e.g. The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. My code is all over the place now but I appreciate you all helping me on my journey to mastery! The int data type is the primary integer data type in SQL Server. ^~~~~~~~~~~~~~~~~~~~~ Only the following conversions can be done with static_cast, except when such conversions would cast away constness or volatility. 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @Dinesh: could you please 1) show us those. to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj Error while setting app icon and launch image in xcode 5.1. Converting a void* to an int is non-portable way that may work or may not! What does it mean to convert int to void* or vice versa? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. What I am trying to do in that line of code is check to make sure each character in my string is alphabetical. A long long would not work for 32bit systems and a long would not work for 64 bit Windows (while 64bit Unix and Unix-like systems like OS X use the LP64 data model, in which a long is 64bit, 64bit Windows uses the LLP64 data model, in which a long has a size of 32bit (http://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models)). Maybe you can try this too. Using Kolmogorov complexity to measure difficulty of problems? Can anybody explain how to pass an integer to a function which receives (void * ) as a parameter? 471,961 Members | 900 Online. That's probably going to be true for most platforms you will ever encounter, but it's not a guarantee; it's implementation-dependent. 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 [.]) Once you manage to make this cast, then what?! In a 64bit build a pointer is 64bit (contrary to a 32bit build, where it is 32bit), while an int is 32bit, so this assignment stores a 64bit value in a 32bit storage, which may result in a loss of information. vegan) just to try it, does this inconvenience the caterers and staff? How to get the error message from the error code returned by GetLastError()? Why does setupterm terminate the program? Mutually exclusive execution using std::atomic? Update: Today, i download the latest version of cocos2d-x (cocos2d-x 2.2.3). Type casting is when you assign a value of one primitive data type to another type. If the destination type is bool, this is a boolean conversion (see below). Acidity of alcohols and basicity of amines. 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. 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]. Replacing broken pins/legs on a DIP IC package, AC Op-amp integrator with DC Gain Control in LTspice. This example is noncompliant on an implementation where pointers are 64 bits and unsigned integers are 32 bits because the result of converting the 64-bit ptr cannot be represented in the 32-bit integer type. 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. Linear regulator thermal information missing in datasheet. Anw, the project still build and run normally when i use Xcode 5.0 with iOS 7.0. In this case, casting the pointer back to an integer is meaningless, because . I assumed that gcc makes a 65536 out of my define, but I was wrong. What Is the Difference Between 'Man' And 'Son of Man' in Num 23:19? 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 Please note that the error I am receiving is "cast to smaller integer type 'int' from 'string' (aka 'char *')" referencing line of code: while (isalpha(residents[i].name) == 0). I am an entry level C programmer. Passing arguments to pthread_create - invalid conversion from void(*)() to void(*)(void*). A sane compiler may throw a warning on lines like this but by no way it should throw an error, because this code is NOT wrong, it is just potentially error-prone, but can be perfectly valid. Implementation-dependent. It's always a good practice to put your #define's in brackets to avoid such surprise. Well occasionally send you account related emails. ^~~~~~~~~~~~~~~~~~~~ Otherwise, if the original pointer value points to an object a, and there is an object b of the . Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? This will get you a pointer from a 32 bit offset: A function pointer is incompatible to void* (and any other non function pointer). Visit Microsoft Q&A to post new questions. ../lib/odp-util.c:5834:5: error: cast to smaller integer type 'unsigned long' from 'void *' [-Werror,-Wvoid-pointer-to-int-cast] What is the difference between const int*, const int * const, and int const *? If your standard library (even if it is not C99) happens to provide these types - use them. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Not the answer you're looking for? You can also convert values from one type to another explicitly using the cast operator (see Chapter 5 ): ( type_name) expression In the following example, the cast operator causes the division of one integer variable by another to be performed as a floating-point operation: int sum = 22, count = 5; double mean = (double)sum / count; rev2023.3.3.43278. But gcc always give me a warning, that i cannot cast an int to a void*. I think the solution 3> should be the correct one. @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. 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. A cast converts an object or value from one type to another. for (i=0, j=0; j
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