example.cc

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#include "example.h"
#include "environment-impl.h"

namespace infact {

// Normally, the various IMPLEMENT_FACTORY declarations would be
// separate from the various REGISTER_* declarations, which would
// usually appear in the separate concrete implementations' .C files.
// For compactness, we have this single .C file, so everything is
// lumped together.

IMPLEMENT_FACTORY(Date)
REGISTER_DATE(DateImpl)

IMPLEMENT_FACTORY(Person)
REGISTER_PERSON(PersonImpl)

IMPLEMENT_FACTORY(Animal)
REGISTER_ANIMAL(Cow)
REGISTER_ANIMAL(Sheep)

IMPLEMENT_FACTORY(PetOwner)
REGISTER_PET_OWNER(HumanPetOwner)

void Sheep::PostInit(const Environment *env, const string &init_str) {
  int env_age;
  // Note how we need to cast Environment down to EnvironmentImpl,
  // because only the implementation has the templated \link
  // EnvironmentImpl::Get \endlink method, because only an
  // implementation can be aware of the all the \link
  // Factory\endlink-constructible types.
  const EnvironmentImpl *env_impl = dynamic_cast<const EnvironmentImpl *>(env);
  if (env_impl != nullptr &&
      env_impl->Get("age", &env_age)) {
    age_ = env_age * 2;
  }
}

}  // namespace infact