Re: Multiple level inheritance in policy classes

From:
ymett <ymett.on.usenet@gmail.com>
Newsgroups:
comp.lang.c++.moderated
Date:
Thu, 26 Feb 2009 18:09:33 CST
Message-ID:
<336a700a-0fc5-456b-91ad-869dbaa010a8@j12g2000vbl.googlegroups.com>
On Feb 25, 9:51 pm, Xavier Pegenaute <xpegena...@gmail.com> wrote:
....

------------ SonPolicy ---------------
template<template <class> class FatherPolicy, class Type>
class SonPolicy : public FatherPolicy<Type> {

};

....

------------ Manager ---------------

template<template <class> class FatherPolicy, template <class> class
SonPolicy, class Type>
class Manager : public SonPolicy<FatherPolicy<Type>, Type> {


The SonPolicy you have here takes one class parameter, and you've
given two class parameters.

Judging by the rest of the code this should be:

template<
   template <class> class FatherPolicy,
   template <template <class> class, class > class SonPolicy,
   class Type>
class Manager : public SonPolicy<FatherPolicy, Type> {

(Note 'FatherPolicy' not 'FatherPolicy<Type>', but you got that right
earlier so I assume you understand the point.)

Reusing the names FatherPolicy and SonPolicy for both the actual
templates and the template parameters caused me some confusion, but
I'm not sure I could find a better way to do it.

Yechezkel Mett

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