cast to void *' from smaller integer type 'int

Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? On all of them int is 32bit, not 16bit. 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. On a 64-bit Windows computer, 'long' is a 32-bit type, and all pointers are 64-bit types. 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 By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. It is commonly called a pointer to T and its type is T*. Thus as a result it may be less error prone to generate a pointer dynamcially and use that. It solved my problem too. The correct answer is, if one does not mind losing data precision. What you do here is undefined behavior, and undefined behavior of very practical sort. 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]. You are correct, but cocos actually only uses that address as a unique id. 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. 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. This allows you to reinterpret the void * as an int. This is flat out wrong. The bigint data type is intended for use when integer values might exceed the range that is supported by the int data type.. bigint fits between smallmoney and int in the data type precedence chart.. 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. So the compiler is very picky here and the correct solution to make the code compile again and still let it show the exact same behavior like in Xcode 5.0 is to first cast to an integer type with a size that matches the one of a pointer and to then do a second cast to the int that we actually want: ids [i] = (int) (size_t)touch; Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? Terrible solution. The result is implementation-defined and typically yields the numeric address of the byte in memory that the pointer pointers to. If we want to get the exact value of 7/5 then we need explicit casting from int to float: Example: int x=7, y=5; It is done by the compiler on its own, without any external trigger from the user. Well it does this because you are converting a 64 bits pointer to an 32 bits integer so you loose information. static const void* M_OFFSET = (void*)64*1024; Since gcc compiles that you are performing arithmetic between void* and an int ( 1024 ). What is the purpose of non-series Shimano components? 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. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Thanks for contributing an answer to Stack Overflow! for (i=0, j=0; j. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Please help me compile Chez Scheme. ncdu: What's going on with this second size column? use $(ARCHS_STANDARD_32_BIT) at Architecture instead of $(ARCHS_STANDARD). We have to pass address of the variable to the function because in function definition argument is pointer variable. // OK: lvalue denoting the original d object, // UB: the b subobject is not a base class subobject, // 6. array-to-pointer followed by upcast, https://en.cppreference.com/mwiki/index.php?title=cpp/language/static_cast&oldid=147983, when converting a 'pointer to object' to 'pointer to, the conversion from floating-point values, the conversion from bit-fields to rvalue references, the conversion from integral or enumeration values to enumeration, the conversion from integral or enumeration values to, the conversion from a member of base class type to, a standard-layout class object with no data members, a non-standard-layout union object and a non-static data, for base-to-derived pointer conversions and, the conversion to enumeration types with fixed underlying type, a standard-layout class might have a non-pointer-interconvertible, If the underlying type is not fixed, the behavior is undefined if the value of, If the underlying type is fixed, the result is the same as, one is a union object and the other is a non-static data member of that object, or. a is of type int[4], which can be implicitly cast to int* (ie, a pointer to an int) &a is of type int(*)[4] (ie: a pointer to an array of 4 ints).

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