Error #171 Invalid Type Conversion

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On_message Invalid Type Conversion

like you, helping each other. Join them; it only takes a minute: Sign up Casting Function Pointer to Integer in C++ up vote 4 down vote favorite I have an array of unsigned integers that need to store pointers to data and functions as well as some data. In the device I am working with, the sizeof pointer is the same as sizeof unsigned int. How can I cast pointer to function into unsigned int? I know that this makes the code not portable, but it is ucontroller specific. I tried this: stackPtr[4] = reinterpret_cast(task_ptr); but it give me an error "invalid type conversion" Casting it to void pointer and then to int is messy. stackPtr[4] = reinterpret_cast(static_cast (task_ptr)); Is there a clean way of doing it? Edit - task_ptr is function pointer void task_ptr(void) Love Barmar's answer, takes my portability shortcoming away. Also array of void pointer actually makes more sense then Unsigned Ints. Thank you Barmar and isaach1000. EDIT 2: Got it, my compiler is thinking large memory model so it is using 32 bit pointers not 16 bit that I was expecting (small micros with 17K total memory). c++ share|improve this question edited May 6 '13 at 17:46 asked May 6 '13 at 15:06 user1135541 5931521 1 Can't you make the array an array of void pointers? –isaach1000 May 6 '13 at 15:07 3 How about using a union of function pointers and data pointers? –Barmar May 6 '13 at 15:09 1 A simple reinterpret_cast should work as long as (a) the integer type is large enough and (b) it's a pointer to a normal (non-member, or static member) function. Is that the case here? What exactly is task_ptr? –Mike Seymour May 6 '13 at 15:20 Wow, Barmar, that would make my code portable! This is a major case of tunnel vision on my part. Thanks a million, your comment is worth 1000+ –user1135541 May 6 '13 at 16:10 1 void

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Invalid type conversion using static_cast, what proper http://stackoverflow.com/questions/16401639/casting-function-pointer-to-integer-in-c casting should I use? up vote 1 down vote favorite I have a type definition of typedef vector ObjList; I also have a function vector* ObjectBox::getBigObjectList();. BigObject is inhertied from Object What I wanted to do is to get a vector* from getBigObjectList() and convert it to vector*, which is an upward casting, and this type is defined as ObjList so I basically wanted to to conver http://stackoverflow.com/questions/14603546/invalid-type-conversion-using-static-cast-what-proper-casting-should-i-use that into a ObjList type I tried two ways, the first is ObjList *normalObjectList = (ObjList*) box->getBigObjectList(); This compiles and I read from this article (When should static_cast, dynamic_cast and reinterpret_cast be used?) which says C-style casting is rarely desireable since it can be develped into a reinterpret-cast Then I try to use static_cast, but I got an error saying Invalid type conversion ObjList *normalObjectList = static_cast (box->ClipObjectInRect()); Neither will this work ObjList *normalObjectList = static_cast*> (box->ClipObjectInRect()); Why isn't this working? Is this because static_cast can only be used to cast a direct class (like Object itself) instead of a nested one (I'm just totally guessing here)? What should I do in this case? c++ casting typedef static-cast share|improve this question asked Jan 30 '13 at 12:03 ryf9059 3271820 static_cast cant cast to unrelated types –Denis Ermolin Jan 30 '13 at 12:05 @DenisErmolin I don't know what you exactly mean by unrelated-types since they are vectors of inherited types and is explicitly defined using typedef. –ryf9059 Jan 30 '13 at 12:08 add a comment| 3 Answers 3 active oldest votes up vote 2 down vote accepted Your reasoning has a very usual flaw; I thin

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