Reference documentation for deal.II version 9.3.3

Public Member Functions  
Reference (const Accessor *accessor, const bool dummy)  
operator number () const  
const Reference &  operator= (const number n) const 
const Reference &  operator+= (const number n) const 
const Reference &  operator= (const number n) const 
const Reference &  operator*= (const number n) const 
const Reference &  operator/= (const number n) const 
Private Attributes  
const Accessor *  accessor 
Reference class. This is what the accessor class returns when you call the value() function. The reference acts just as if it were a reference to the actual value of a matrix entry, i.e. you can read and write it, you can add and multiply to it, etc, but since the matrix does not give away the address of this matrix entry, we have to go through functions to do all this.
The constructor takes a pointer to an accessor object that describes which element of the matrix it points to. This creates an ambiguity when one writes code like iterator>value()=0 (instead of iterator>value()=0.0), since the right hand side is an integer that can both be converted to a number
(i.e., most commonly a double) or to another object of type Reference
. The compiler then complains about not knowing which conversion to take.
For some reason, adding another overload operator=(int) doesn't seem to cure the problem. We avoid it, however, by adding a second, dummy argument to the Reference constructor, that is unused, but makes sure there is no second matching conversion sequence using a oneargument right hand side.
Definition at line 185 of file chunk_sparse_matrix.h.