"clang" "-Ilib\libopenvswitch.a.p" "-Ilib" "-I..\lib" "-I." p-util.c.obj "-c" ../lib/odp-util.c Sign in Infact I know several systems where that does not hold. Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? What is the correct method to cast an int to a void*? Java Type Casting (With Examples) - Programiz ../lib/odp-util.c:5601:9: note: expanded from macro 'SCAN_PUT' You can use any other pointer, or you can use (size_t), which is 64 bits. Using an integer address (like &x) is probably wrong, indeed each modification you will execute on x will affect the pass behaviour. If this is the data to a thread procedure, then you quite commonly want to pass by value. Implicit Type Conversion is also known as 'automatic type conversion'. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? 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. 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. Example: int x=7, y=5; float z; z=x/y; /*Here the value of z is 1*/. Press question mark to learn the rest of the keyboard shortcuts. So you know you can cast it back like this. Mutually exclusive execution using std::atomic? Usually that means the pointer is allocated with. ../lib/odp-util.c:5665:7: note: expanded from macro 'SCAN_SINGLE' There exist two main syntaxes for generic type-casting: functional and c-like: 1 2 3 4 double x = 10.3; int y; y = int (x); // functional notation y = (int) x; // c-like cast notation The functionality of these generic forms of type-casting is enough for most needs with fundamental data types. You are just making it bigger by tricking the compiler and the ABI. Converts between types using a combination of implicit and user-defined conversions. Why is this sentence from The Great Gatsby grammatical? to your account, [87/252] Compiling C object lib/libopenvswitch.a.p/odp-util.c.obj casting from int to void* and back to int. use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD). Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? To learn more, see our tips on writing great answers. As for the stack, I've written a few libraries using pthreds, thus I don't agree that what you describe "is quite often the case". The point is (probably) that the value passed to the thread is an integer value, not really a 'void *'. All float types are to be converted to double. Not the answer you're looking for? If that happens soon after the call to pthread_create() then you have a race condition, because there's a chance that the thread will attempt to read x's value after it's life has ended, which invokes undefined behavior. A cast is a way of explicitly informing the compiler that you intend to make the conversion and that you are aware that data loss might occur, or the cast may fail at run time. linux c-pthreads: problem with local variables. Even if you are compiling your program for a 32-bit computer, you should fix your code to remove these warnings, to ensure your code is easily portable to 64-bit. Maybe you can try this too. Please unaccept the answer you have chosen as it is wrong (as the comments below it say) and will lead to bugs. For the Nozomi from Shinagawa to Osaka, say on a Saturday afternoon, would tickets/seats typically be available - or would you need to book? Connect and share knowledge within a single location that is structured and easy to search. Where does this (supposedly) Gibson quote come from? How can this new ban on drag possibly be considered constitutional? this way you won't get any warning. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. /** Dynamically allocate a 2d (x*y) array of elements of size _size_ bytes. should we also have a diagnostic for the (presumed) user error? In the first example, the variable c1 of the char type is converted to a temporary variable of the int type, because the second operand in the division operation, the constant 2, is of the higher type int. Don't pass your int as a void*, pass a int* to your int, so you can cast the void* to an int* and copy the dereferenced pointer to your int. STR34-C. Cast characters to unsigned char before converting to larger Notifications. I'm new to coding and am trying to implement a simple program on my own, that prompts the user the number of residents in an apt complex, the prompts the user to enter the names and apt numbers of each resident. Using indicator constraint with two variables. sound/soc/codecs/tlv320aic32x4.c:1202:18: warning: cast to smaller 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). Re: [PATCH, PR 53001] Re: Patch to split out new warning flag for ^~~~~~~~~~~~~~~~~~~~ error: comparison between pointer and integer ('int' and 'string' (aka 'char *')), CS50 Caesar program is working but check50 says it isn't. equal to the original pointer: First you are using a define, which is not a variable. However, I believe that even if the define was for the "65536", it would not be what @kaetzacoatl wanted. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. As Ferruccio said, int must be replaced with intptr_t to make the program meaningful. How to correctly cast a pointer to int in a 64-bit application? If you really need such trickery, then consider one of dedicated types, which are intptr_t and uintptr_t. It is purely a compile-time directive which instructs the compiler to treat expression as if it had . Based on the design of this function, which modification is right. BUT converting a pointer to void* and back again is well supported (everywhere). 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. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. . c - How to cast an integer to void pointer? - Stack Overflow By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Then i can continue compiling. Passing arguments to pthread_create - invalid conversion from void(*)() to void(*)(void*). And then assign it to the double variable. How to correctly cast a pointer to int in a 64-bit application? "I think what you should do is actually pass the address of the variable to the function" Not necessarily. In both cases, converting the pointer to an integer type that's too small to represent all pointer values is a bug. Thanks for contributing an answer to Stack Overflow! What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? From what I read about casting in the C11 standard, my feeling is, that it is arguable to emit a warning on an explicit conversion. even though the compiler doesn't know you only ever pass myFcn to pthread_create in conjunction with an integer. What is the difference between const int*, const int * const, and int const *? What does casting to void* does when passing arguments to variadic functions? Casting type int to const void* - C / C++ void* -> integer -> void* rather than integer -> void* -> integer. LLNL's tutorial is bad and they should feel bad. */void **MatrixIB (unsigned long x, unsigned long y, int size){ void *ptr; void **returnPtr; register unsigned long i, j; returnPtr = (void **) malloc (x * sizeof(void *)); ptr = (void *) malloc (x * y * size); for (i=0, j=0; j
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