Re: [boost] reinterpret_cast : differents structs or classes with identical structural type

on Fri Sep 21 2007, "Marco Servetto" <marco.servetto-AT-gmail.com> wrote:

Hello, Supposing having struct A{ int a1; double a2; int a3[3]; }; struct B{ int b1; double b2; int b3[3]; };

A and B are two structure with same strucutural type but different name, (and different name for fields...)

The question is: C++ grants that A a; a.a2=8.8; assert(reinterpret_cast<B*>(&a)->b2==8.8);

C++ guarantees very, very little about reinterpret_cast, and certainly not that. In general the results of reinterpret_cast are implementation-defined. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com