ExplicitStorage (continous storage) of a graphical model function data. More...

#include <graphicalmodel_explicit_storage.hxx>

Collaboration diagram for opengm::ExplicitStorage< GM >:

Public Member Functions
	ExplicitStorage (const GraphicalModelType &gm)

	~ExplicitStorage ()

ValueType const *	operator[] (const FactorType &factor) const

Detailed Description

template<class GM>
class opengm::ExplicitStorage< GM >

ExplicitStorage (continous storage) of a graphical model function data.

ExplicitStorage stores all instances of all functions into a single continous stride of memory. Given a factor one gets the begin pointer of the corresponding function. The storage of the function is in last coordinate major order.

Usage:

opengm::ExplicitStorage<GmType> storage(gm);
typedef GmType::FactorType::ShapeIteratorType ShapeIteratorType;
// loop over all factors
for(size_t factor=0;factor<gmA.numberOfFactors();++factor){
   // "usual" way to iterate over the factors values with coordinates
   // is with the shapewalker class
   opengm::ShapeWalker< ShapeIteratorType > walker(gm[factor].shapeBegin(),gm[factor].numberOfVariables());
   // get the begin pointer to the storage of the factors function
   GmType::ValueType const *  ptr=storageA[gmA[factor]];
   // toy / test loop over all factors values
   // and compare (expensive) direct access via the factors
   // and cheap access via pointer
   for (size_t i = 0; i < gmA[factor].size(); ++i) {
       OPENGM_TEST_EQUAL(gmA[factor](walker.coordinateTuple().begin()),ptr[i]);
        ++walker;
   }
}