stateiterator-class.h
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
#ifndef FST_SCRIPT_STATEITERATOR_CLASS_H_
#define FST_SCRIPT_STATEITERATOR_CLASS_H_
#include <memory>
#include <fst/fstlib.h>
#include <fst/script/fst-class.h>
// Scripting API support for StateIterator.
namespace fst {
namespace script {
// Virtual interface implemented by each concrete StateIteratorImpl<F>.
class StateIteratorImplBase {
public:
virtual bool Done() const = 0;
virtual int64 Value() const = 0;
virtual void Next() = 0;
virtual void Reset() = 0;
virtual ~StateIteratorImplBase() {}
};
// Templated implementation.
template <class Arc>
class StateIteratorClassImpl : public StateIteratorImplBase {
public:
explicit StateIteratorClassImpl(const Fst<Arc> &fst) : siter_(fst) {}
bool Done() const final { return siter_.Done(); }
int64 Value() const final { return siter_.Value(); }
void Next() final { siter_.Next(); }
void Reset() final { siter_.Reset(); }
~StateIteratorClassImpl() override {}
private:
StateIterator<Fst<Arc>> siter_;
};
class StateIteratorClass;
using InitStateIteratorClassArgs =
std::pair<const FstClass &, StateIteratorClass *>;
// Untemplated user-facing class holding a templated pimpl.
class StateIteratorClass {
public:
explicit StateIteratorClass(const FstClass &fst);
template <class Arc>
explicit StateIteratorClass(const Fst<Arc> &fst)
: impl_(new StateIteratorClassImpl<Arc>(fst)) {}
bool Done() const { return impl_->Done(); }
int64 Value() const { return impl_->Value(); }
void Next() { impl_->Next(); }
void Reset() { impl_->Reset(); }
template <class Arc>
friend void InitStateIteratorClass(InitStateIteratorClassArgs *args);
private:
std::unique_ptr<StateIteratorImplBase> impl_;
};
template <class Arc>
void InitStateIteratorClass(InitStateIteratorClassArgs *args) {
const Fst<Arc> &fst = *(std::get<0>(*args).GetFst<Arc>());
std::get<1>(*args)->impl_.reset(new StateIteratorClassImpl<Arc>(fst));
}
} // namespace script
} // namespace fst
#endif // FST_SCRIPT_STATEITERATOR_CLASS_H_