Message du 02/05/11 22:50 De : "Thorsten Ottosen" A : boost@lists.boost.org Copie à : Objet : Re: [boost] [BOOST CORE C++ Feature] the super or base keyword for C++
Den 01-05-2011 07:54, tymofey skrev:
I was wondering if it makes sense to add the well known super or base keyword to the C++ language in a generic way. C++ has multiple inheritance, while java and C# do not, so super would be ambigous.
Please see
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2881.html
It will be great if this technique could be used to emulate single inheritance base class aliases, so instead of duplicating the base type template class bitset : private _Base_bitset < ((_Nb) < 1 ? 0 : ((_Nb) + numeric_limits::digits - 1) / numeric_limits::digits)
{ private: typedef _Base_bitset < ((_Nb) < 1 ? 0 : ((_Nb) + numeric_limits::digits - 1) / numeric_limits::digits)
_Base; // [...] }; we could just name it through a base typedef. template class bitset : public private_base<_Base_bitset < ((_Nb) < 1 ? 0 : ((_Nb) + numeric_limits::digits - 1) / numeric_limits::digits)
{ // private_base introduce base_type in scope here }; The single remaining problem is the forward constructor. We could add a macro that generates base like classes with specific names and have template class bitset : PRIVATE_BASE_ALIAS(_Base, (_Base_bitset < ((_Nb) < 1 ? 0 : ((_Nb) + numeric_limits::digits - 1) / numeric_limits::digits)
)) { // private_base introduce _Base type in scope here }; Of course macros are ugly and needs to double braquets. Best, Vicente