Extract an element of the target dimension in sparse form without an oracle. More...

#include <Extractor.hpp>

Public Member Functions
virtual SparseRange< Value_, Index_ >	fetch (Index_ i, Value_ value_buffer, Index_ index_buffer)=0

Detailed Description

template<typename Value_, typename Index_>
class tatami::MyopicSparseExtractor< Value_, Index_ >

Extract an element of the target dimension in sparse form without an oracle.

Template Parameters

Value_	Data value type, should be numeric.
Index_	Row/column index type, should be integer.

Member Function Documentation

◆ fetch()

template<typename Value_ , typename Index_ >

virtual SparseRange< Value_, Index_ > tatami::MyopicSparseExtractor< Value_, Index_ >::fetch	(	Index_	i,
		Value_ *	value_buffer,
		Index_ *	index_buffer )

pure virtual

value_buffer may not necessarily be filled upon extraction if a pointer can be returned to the underlying data store. This be checked by comparing the returned SparseRange::value pointer to value_buffer; if they are the same, value_buffer has been filled with SparseRange::number values. The same applies for index_buffer and the returned SparseRange::index pointer.

If Options::sparse_extract_value was set to false during construction of this instance, value_buffer is ignored and SparseRange::value is set to NULL in the output. Similarly, if Options::sparse_extract_index was set to false during construction of this instance, index_buffer is ignored and SparseRange::index is set to NULL in the output.

Parameters

	i	Index of the target dimension element, i.e., the row or column index.
[out]	value_buffer	Pointer to an array with enough space for at least `N` values, where `N` is defined as described for `MyopicDenseExtractor::fetch()`.
[out]	index_buffer	Pointer to an array with enough space for at least `N` indices, where `N` is defined as described for `MyopicDenseExtractor::fetch()`.

Returns: A SparseRange object describing the contents of the i-th dimension element.

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

tatami/base/Extractor.hpp

Public Member Functions

Detailed Description

Member Function Documentation

◆ fetch()