On 10 May 2017 at 20:15, Chris Vine <vine35792...@gmail.com> wrote: > > You can use reinterpret_cast when casting between C types which employ > "C style" inheritance (that is, where the "parent" is a struct which is > the first member of the "child" struct). This is because C structs are > of necessity standard layout types in C++ speak. More to the point, > because such inheritance is not inheritance in the C++ sense (they are > unrelated types from the C++ inheritance point of view) casting can > only be done using a C cast or a reinterpret_cast, which is guaranteed > to work by ยง9.2/20 of the C++ standard. > > If that was what your post was about, then I think you are fine. >
Thanks for the thoughts! Yeah, the cases I am pondering at the moment are casts between GObjects, using the typical mode of inheritance that you described. static_cast<> doesn't work, but reinterpret_cast<> *seems to*. It sounds like this is a case for which reinterpret_cast<> does work, and not one of the perilous ones that you mentioned later. Do you have any recommended reading on the cases which C casts can handle, and adjust as required, but reinterpret_cast<> cannot? That was surprising to me as I thought the C++ casts could cover all the angles.
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