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#ifndef FF_FSA_DYNAMIC_H
#define FF_FSA_DYNAMIC_H
struct SentenceMetadata;
#include "ff_fsa_data.h"
#include "hg.h" // can't forward declare nested Hypergraph::Edge class
#include <sstream>
// the type-erased interface
//FIXME: diamond inheritance problem. make a copy of the fixed data? or else make the dynamic version not wrap but rather be templated CRTP base (yuck)
struct FsaFeatureFunction : public FsaFeatureFunctionData {
static const bool simple_phrase_score=false;
virtual int markov_order() const = 0;
// see ff_fsa.h - FsaFeatureFunctionBase<Impl> gives you reasonable impls of these if you override just ScanAccum
virtual void ScanAccum(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID w,void const* state,void *next_state,Accum *a) const = 0;
virtual void ScanPhraseAccum(SentenceMetadata const& smeta,Hypergraph::Edge const & edge,
WordID const* i, WordID const* end,
void const* state,void *next_state,Accum *accum) const = 0;
virtual void ScanPhraseAccumOnly(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID const* i, WordID const* end,
void const* state,Accum *accum) const = 0;
virtual void *ScanPhraseAccumBounce(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,void *cs,void *ns,Accum *accum) const = 0;
virtual int early_score_words(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,Accum *accum) const { return 0; }
// called after constructor, before use
virtual void Init() = 0;
virtual std::string usage_v(bool param,bool verbose) const {
return FeatureFunction::usage_helper("unnamed_dynamic_fsa_feature","","",param,verbose);
}
virtual void init_name_debug(std::string const& n,bool debug) {
FsaFeatureFunctionData::init_name_debug(n,debug);
}
virtual void print_state(std::ostream &o,void const*state) const {
FsaFeatureFunctionData::print_state(o,state);
}
virtual std::string describe() const { return "[FSA unnamed_dynamic_fsa_feature]"; }
//end_phrase()
virtual ~FsaFeatureFunction() {}
// no need to override:
std::string describe_state(void const* state) const {
std::ostringstream o;
print_state(o,state);
return o.str();
}
};
// conforming to above interface, type erases FsaImpl
// you might be wondering: why do this? answer: it's cool, and it means that the bottom-up ff over ff_fsa wrapper doesn't go through multiple layers of dynamic dispatch
// usage: typedef FsaFeatureFunctionDynamic<MyFsa> MyFsaDyn;
template <class Impl>
struct FsaFeatureFunctionDynamic : public FsaFeatureFunction {
static const bool simple_phrase_score=Impl::simple_phrase_score;
Impl& d() { return impl;//static_cast<Impl&>(*this);
}
Impl const& d() const { return impl;
//static_cast<Impl const&>(*this);
}
int markov_order() const { return d().markov_order(); }
std::string describe() const {
return d().describe();
}
virtual void ScanAccum(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID w,void const* state,void *next_state,Accum *a) const {
return d().ScanAccum(smeta,edge,w,state,next_state,a);
}
virtual void ScanPhraseAccum(SentenceMetadata const& smeta,Hypergraph::Edge const & edge,
WordID const* i, WordID const* end,
void const* state,void *next_state,Accum *a) const {
return d().ScanPhraseAccum(smeta,edge,i,end,state,next_state,a);
}
virtual void ScanPhraseAccumOnly(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID const* i, WordID const* end,
void const* state,Accum *a) const {
return d().ScanPhraseAccumOnly(smeta,edge,i,end,state,a);
}
virtual void *ScanPhraseAccumBounce(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,void *cs,void *ns,Accum *a) const {
return d().ScanPhraseAccumBounce(smeta,edge,i,end,cs,ns,a);
}
virtual int early_score_words(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,Accum *accum) const {
return d().early_score_words(smeta,edge,i,end,accum);
}
static std::string usage(bool param,bool verbose) {
return Impl::usage(param,verbose);
}
std::string usage_v(bool param,bool verbose) const {
return Impl::usage(param,verbose);
}
virtual void print_state(std::ostream &o,void const*state) const {
return d().print_state(o,state);
}
void init_name_debug(std::string const& n,bool debug) {
FsaFeatureFunction::init_name_debug(n,debug);
d().init_name_debug(n,debug);
}
virtual void Init() {
d().sync_to_=(FsaFeatureFunctionData*)this;
d().Init();
d().sync();
}
template <class I>
FsaFeatureFunctionDynamic(I const& param) : impl(param) {
Init();
}
private:
Impl impl;
};
// constructor takes ptr or shared_ptr to Impl, otherwise same as above - note: not virtual
template <class Impl>
struct FsaFeatureFunctionPimpl : public FsaFeatureFunctionData {
typedef boost::shared_ptr<Impl const> Pimpl;
static const bool simple_phrase_score=Impl::simple_phrase_score;
Impl const& d() const { return *p_; }
int markov_order() const { return d().markov_order(); }
std::string describe() const {
return d().describe();
}
void ScanAccum(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID w,void const* state,void *next_state,Accum *a) const {
return d().ScanAccum(smeta,edge,w,state,next_state,a);
}
void ScanPhraseAccum(SentenceMetadata const& smeta,Hypergraph::Edge const & edge,
WordID const* i, WordID const* end,
void const* state,void *next_state,Accum *a) const {
return d().ScanPhraseAccum(smeta,edge,i,end,state,next_state,a);
}
void ScanPhraseAccumOnly(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,
WordID const* i, WordID const* end,
void const* state,Accum *a) const {
return d().ScanPhraseAccumOnly(smeta,edge,i,end,state,a);
}
void *ScanPhraseAccumBounce(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,void *cs,void *ns,Accum *a) const {
return d().ScanPhraseAccumBounce(smeta,edge,i,end,cs,ns,a);
}
int early_score_words(SentenceMetadata const& smeta,Hypergraph::Edge const& edge,WordID const* i, WordID const* end,Accum *accum) const {
return d().early_score_words(smeta,edge,i,end,accum);
}
static std::string usage(bool param,bool verbose) {
return Impl::usage(param,verbose);
}
std::string usage_v(bool param,bool verbose) const {
return Impl::usage(param,verbose);
}
void print_state(std::ostream &o,void const*state) const {
return d().print_state(o,state);
}
#if 0
// this and Init() don't touch p_ because we want to leave the original alone.
void init_name_debug(std::string const& n,bool debug) {
FsaFeatureFunctionData::init_name_debug(n,debug);
}
#endif
void Init() {
p_=hold_pimpl_.get();
#if 0
d().sync_to_=static_cast<FsaFeatureFunctionData*>(this);
d().Init();
#endif
*static_cast<FsaFeatureFunctionData*>(this)=d();
}
FsaFeatureFunctionPimpl(Impl const* const p) : hold_pimpl_(p,null_deleter()) {
Init();
}
FsaFeatureFunctionPimpl(Pimpl const& p) : hold_pimpl_(p) {
Init();
}
private:
Impl const* p_;
Pimpl hold_pimpl_;
};
typedef FsaFeatureFunctionPimpl<FsaFeatureFunction> FsaFeatureFunctionFwd; // allow ff_from_fsa for an existing dynamic-type ff (as opposed to usual register a wrapped known-type FSA in ff_register, which is more efficient)
//typedef FsaFeatureFunctionDynamic<FsaFeatureFunctionFwd> DynamicFsaFeatureFunctionFwd; //if you really need to have a dynamic fsa facade that's also a dynamic fsa
//TODO: combine 2 (or N) FsaFeatureFunction (type erased)
#endif
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