template<typename TAR>
struct lib::factory::Build< TAR >
Policy: use a custom functor to finish the generated product.
Remarks
the nested structure allows to define both the raw type and the wrapped type. On instantiation of the MultiFact, pass the nested Wrapper struct template param.
Warning
the RAW type must match the result type of the MultiFac SIG. Beware of passing references or pointers to local data.