vector_view.hxx

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#ifndef OPENGM_VECTOR_VIEW
#define OPENGM_VECTOR_VIEW

namespace opengm{

template<class VECTOR,class INDEX_TYPE>
class VectorView{

public:



   typedef VECTOR VectorType;
   typedef INDEX_TYPE IndexType;
   typedef typename VectorType::value_type ValueType;

   typedef typename VectorType::const_iterator const_iterator;
   typedef typename VectorType::iterator iterator;

   VectorView(){}


   VectorView(
      const VectorType & vector
   ) :   vectorPtr_(&vector),
      start_(0),
      size_(0){

   }


   VectorView(
      const VectorType & vector,
      const IndexType start,
      const IndexType size
   ) :   vectorPtr_(&vector),
      start_(start),
      size_(size){

   }

   void assign(
      const VectorType & vector,
      const IndexType start,
      const IndexType size
   ){
      vectorPtr_=&vector;
      start_=start;
      size_=size;
   }


   void assignPtr(
      const VectorType & vector
   ){
      vectorPtr_=&vector;
   }


   iterator begin(){
      return vectorPtr_->begin()+start_;
   }
   iterator end(){
      return vectorPtr_->begin()+start_+size_;
   }

   const_iterator begin()const{
      return vectorPtr_->begin()+start_;
   }
   const_iterator end()const{
      return vectorPtr_->begin()+start_+size_;
   }


   const IndexType size()const{
      return size_;
   }
   const ValueType & operator[](const IndexType i)const{
      return (*vectorPtr_)[start_+i];
   }
   ValueType & operator[](const IndexType i){
      return (*vectorPtr_)[start_+i];
   }


private:
   const VectorType * vectorPtr_;
   IndexType start_;
   IndexType size_;

};

}


#endif