c++ Programming Glossary: vptr

Storing boost::function objects in a container

http://stackoverflow.com/questions/13094720/storing-boostfunction-objects-in-a-container

function pointer instead of allocation abstract class vptr . So it has one less inderection it easier to manage. Cons If..

How to pass a C++ class with array of pointers to CUDA?

http://stackoverflow.com/questions/14790999/how-to-pass-a-c-class-with-array-of-pointers-to-cuda

v vecptr 0 a v vecptr 1 b v dim 0 3 v dim 1 4 int vptr N cudaMalloc void dev_v sizeof vecarray cudaCheckErrors cudaMalloc1.. cudaMemcpy1 fail for int i 0 i N i cudaMalloc void vptr i v dim i sizeof int cudaCheckErrors cudaMalloc2 fail cudaMemcpy.. cudaCheckErrors cudaMalloc2 fail cudaMemcpy dev_v vecptr i vptr i sizeof int cudaMemcpyHostToDevice cudaCheckErrors cudaMemcpy2..

void pointers: difference between C and C++

http://stackoverflow.com/questions/1736833/void-pointers-difference-between-c-and-c

to assign to int while C does. However here void foo void vptr int main int p int malloc sizeof int foo p return 0 Both C and..

object size with virtual

http://stackoverflow.com/questions/2038717/object-size-with-virtual

using sizeof B it prints 12 Does it mean that only one vptr is there even both of class B and class A have virtual function.. B and class A have virtual function Why there is only one vptr class A public int a virtual void v class B public int b virtual.. The sizeof C is 20........ It seems that in this case two vptrs are in the layout.....How does this happen I think the two..

how c++ implements the polymorphism internally?

http://stackoverflow.com/questions/2171081/how-c-implements-the-polymorphism-internally

for person and teacher name type_info for person __vptr__person person ~person person p person show person.. show person subobject type_info for teacher __vptr__teacher teacher ~teacher teacher t teacher show In.. the compiler to internally transform the call into ptr vptr 2 ptr In this transformation vptr represents the internally..

Should every class have a virtual destructor?

http://stackoverflow.com/questions/353817/should-every-class-have-a-virtual-destructor

8 on 64 bit machines additional bytes per object for the vptr . On the other hand if someone later derives from this class..

Alternative virtual mechanism implementations?

http://stackoverflow.com/questions/4352032/alternative-virtual-mechanism-implementations

with just a virtual function will be size of an pointer vptr inside this on that compiler So given that virtual ptr and tbl..

At as deep of a level as possible, how are virtual functions implemented?

http://stackoverflow.com/questions/99297/at-as-deep-of-a-level-as-possible-how-are-virtual-functions-implemented

virtual functions contains a virtual pointer called the vptr at the very beginning of the object in the memory. Hence the.. in this case increases by the size of the pointer. This vptr contains the base address of the virtual table in memory. Note.. time when a virtual function is called on an object the vptr of that object provides the base address of the virtual table..