xAOD::AddDVProxy::Helper< T > Struct Template Reference

Helper structure implementing the resize(...) function. More...

Collaboration diagram for xAOD::AddDVProxy::Helper< T >:

Public Types
typedef T	Cont_t
	Type of the DataVector container.
typedef Cont_t::base_value_type	Value_t
	Type of the elements in the DataVector.

Static Public Member Functions
static void	resize (void *obj, size_t size)
	Function taking care of resizing DataVector<T> objects in memory.

Detailed Description

template<class T>
struct xAOD::AddDVProxy::Helper< T >

Helper structure implementing the resize(...) function.

When reading a branch of DataVector<T>, one needs to use a non-generic version of the resize(...) function. This implementation should work fine for all DataVector<T> types.

Author

Attila Krasznahorkay Attil.nosp@m.a.Kr.nosp@m.aszna.nosp@m.hork.nosp@m.ay@ce.nosp@m.rn.c.nosp@m.h

Definition at line 99 of file AddDVProxy.h.

Member Typedef Documentation

Cont_t

template<class T>

typedef T xAOD::AddDVProxy::Helper< T >::Cont_t

Type of the DataVector container.

Definition at line 102 of file AddDVProxy.h.

Value_t

template<class T>

typedef Cont_t::base_value_type xAOD::AddDVProxy::Helper< T >::Value_t

Type of the elements in the DataVector.

Definition at line 104 of file AddDVProxy.h.

Member Function Documentation

resize()

template<class T>

void xAOD::AddDVProxy::Helper< T >::resize ( void * obj, size_t size )

inlinestatic

Function taking care of resizing DataVector<T> objects in memory.

when branches are read from a TTree.

Parameters

obj	A pointer to the full-blown DataVector object
size	The size to re-size the vector to

Definition at line 111 of file AddDVProxy.h.

                                                       {
 
            // Cast the container to the right type:
            Cont_t* c = reinterpret_cast< Cont_t* >( obj );
 
            // Detach the DataVector from its auxiliary store:
            c->setStore( ( SG::IAuxStore* ) 0 );
 
            // Resize the container:
            c->resize( size );
 
            // Make sure that all elements exist and are usable:
            for( size_t i = 0; i < size; ++i ) {
 
               // If the element already exists, we're done:
               if( ( *c )[ i ] ) continue;
 
               // Create a new element:
               ( *c )[ i ] = new Value_t();
            }
 
            return;
         }

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The documentation for this struct was generated from the following file:

• AddDVProxy.h