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/*
# Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
#
# This program is free software distributed under the GPL version 2.
# See http://openslx.org/COPYING
#
# If you have any feedback please consult http://openslx.org/feedback and
# send your suggestions, praise, or complaints to feedback@openslx.org
#
# General information about OpenSLX can be found at http://openslx.org/
# --------------------------------------------------------------------------
# detail/policyChain.h:
# - Tie together the different bits of policy information a handler may
# give us
# --------------------------------------------------------------------------
*/
#ifndef POLICYCHAIN_H_
#define POLICYCHAIN_H_
#include "typeList.h"
namespace input_policy
{
namespace detail
{
template<typename BaseCase, typename PolicyList>
struct PolicyChain : public PolicyList::head::template apply_<PolicyChain<BaseCase, typename PolicyList::tail> >
{
};
template<typename BaseCase>
struct PolicyChain<BaseCase, EmptyList> : public BaseCase
{
};
}
}
/////////////////////////////////////////////////////////////////////////
// Macros that enable specification of policies:
// A policy is declared like this:
// template< PARAM1, PARAM2, ... >
// BEGIN_POLICY_CLASS(MyPolicy) {
// static const int field1 = 2;
// ...
// } END_POLICY_CLASS(MyPolicy);
/////////////////////////////////////////////////////////////////////////
#define BEGIN_POLICY_CLASS(policyName) \
struct policyName { \
template<typename NextPolicy> \
struct apply_ : public NextPolicy
#define END_POLICY_CLASS \
; };
/////////////////////////////////////////////////////////////////////////
// A macro that enables us to use a template parameter list
// in a class using a policy, like this:
//
// template<POLICY_PARAMS>
// struct MyPolicyBasedClass
// {
// typedef USE_POLICY(baseCase) policy_type;
// };
//
// now, the following type is valid:
// MyPolicyBasedClass<Policy1, Policy2>
/////////////////////////////////////////////////////////////////////////
#define POLICY_PARAMS IMPLICIT_TYPE_LIST_PARAMS(Policy)
#define POLICY_PARAMS_LIST IMPLICIT_TYPE_LIST(Policy)
#define USE_POLICY(baseCase) ::input_policy::detail::PolicyChain<baseCase, POLICY_PARAMS_LIST>
#endif /* POLICYCHAIN_H_ */
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