At Fri, 25 Jun 2010 08:11:28 -0700 (PDT), gzp wrote:
My first idea was to use multiple inheritance, but it result error (ambiguous call) struct A {}; struct B : A {}; struct A2 : A {}; struct B2 : A2, B {};
void foo( A ) { alg1... } void foo( B ) { alg2... specialized for B } void foo( A2 ) { alg3... specialized for A2 } void g() { B2 b; f(b); } // error: is it f(B) or f(A2)
<snipp>
So my question is that, is it a working method, or the whole concept is wrong ?
Your best bet here is probably to use multiple _virtual_ inheritance struct A {}; struct B : virtual A {}; struct A2 : virtual A {}; struct B2 : virtual A2, virtual B {}; You might also want to check the generated code, though. It's conceivable (although probably not very important if so) that the compiler won't optimize away the tag structs. -- Dave Abrahams BoostPro Computing http://www.boostpro.com