next

Single Point of Decision (SPoD)

Create a Header MyRepository.h with the following definitions:

just define a List of Types you want to visit:

#include<visitor/cyclic/Repository.h>
#include<visitor/acyclic/Repository.h>

class E1; class E2; class NonVisitable;
using typelist = VisitorFramework::Typelist<E1, E2, NonVisitable>;

You only need forward declarations of the types. If a type is not Visitable, use an Adapter.

and define (instantiate) a Repository:

with the properties you want your Implementations to have

//CAR = shortcut for CyclicAcyclicRepository
//namespace CAR = VisitorFramework::Cyclic;
namespace CAR = VisitorFramework::Acyclic;

using Repository = CAR::Repository
<
  VisitorFramework::EmptyLoggingPolicy, // logs nothing
  BaseKind::Abstract,                   // no default methods
  typelist                              // the types you want to visit
>;

switch between cyclic and acyclic by exchanging namespace CAR = .

switch between different types of DefaultPolicies by choosing the one you want

switch between different BaseKind by choosing BaseKind::Abstract or BaseKind::Default

You can also specifiy a comma separated list of types as an argument instead of typelist.

see also SwitchCyclicAcyclicRepository.h

next