SG::IndexHolder< T > Class Template Reference

Store an ElementLink index for non-vector containers. More...

#include <IndexHolder.h>

Collaboration diagram for SG::IndexHolder< T >:

Public Member Functions
	IndexHolder ()
	Constructor. More...
	IndexHolder (const T &t)
	Copy constructor. More...
bool	isValid () const
	Return valid flag. More...
void	reset ()
	Reset the index to a null value. More...
	operator const T & () const
	Retrieve the index. More...

Private Attributes
T	m_index
	The stored index. More...
bool	m_valid
	True if the index is valid. More...

Detailed Description

template<class T>
class SG::IndexHolder< T >

Store an ElementLink index for non-vector containers.

When we store an index to a vector container, we use -1 as an invalid index value. However, in the general case where we have a container with an index of arbitrary type, we don't have a distinguished value we can use to represent invalid. So for that case, we need to store an additional valid flag along with the index. Things are factored like this so that we can avoid storing the flag for the common case of indexing a vector.

Definition at line 35 of file IndexHolder.h.

Constructor & Destructor Documentation

IndexHolder() [1/2]

template<class T >

SG::IndexHolder< T >::IndexHolder ( )

inline

Constructor.

Definition at line 39 of file IndexHolder.h.

: m_index(), m_valid(false) {}

IndexHolder() [2/2]

template<class T >

SG::IndexHolder< T >::IndexHolder ( const T &  t )

inline

Copy constructor.

Definition at line 42 of file IndexHolder.h.

: m_index(t), m_valid(true) {}

Member Function Documentation

isValid()

template<class T >

bool SG::IndexHolder< T >::isValid ( ) const

inline

Return valid flag.

Definition at line 45 of file IndexHolder.h.

{ return m_valid; }

operator const T &()

template<class T >

SG::IndexHolder< T >::operator const T & ( ) const

inline

Retrieve the index.

Definition at line 51 of file IndexHolder.h.

{ return m_index; }

reset()

template<class T >

void SG::IndexHolder< T >::reset ( )

inline

Reset the index to a null value.

Definition at line 48 of file IndexHolder.h.

{ m_valid = false; m_index = T(); }

Member Data Documentation

m_index

template<class T >

T SG::IndexHolder< T >::m_index

private

The stored index.

Definition at line 56 of file IndexHolder.h.

m_valid

template<class T >

bool SG::IndexHolder< T >::m_valid

private

True if the index is valid.

Definition at line 59 of file IndexHolder.h.

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

• IndexHolder.h