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blocked_range3d

[algorithms.blocked_range3d]

Class template that represents a recursively divisible three-dimensional half-open interval.

A blocked_range3d is the three-dimensional extension of blocked_range2d.

namespace oneapi {
    namespace tbb {
        template<typename PageValue, typename RowValue=PageValue, typename ColValue=RowValue>
        class blocked_range3d {
        public:
            // Types
            using page_range_type = blocked_range<PageValue>;
            using row_range_type = blocked_range<RowValue>;
            using col_range_type = blocked_range<ColValue>;

            // Constructors
            blocked_range3d(
                PageValue page_begin, PageValue page_end,
                typename page_range_type::size_type page_grainsize,
                RowValue row_begin, RowValue row_end,
                typename row_range_type::size_type row_grainsize,
                ColValue col_begin, ColValue col_end,
                typename col_range_type::size_type col_grainsize );
            blocked_range3d( PageValue page_begin, PageValue page_end
                            RowValue row_begin, RowValue row_end,
                            ColValue col_begin, ColValue col_end );
            blocked_range3d( blocked_range3d& r, split );
            blocked_range3d( blocked_range3d& r, proportional_split& proportion );

            // Capacity
            bool empty() const;

            // Access
            bool is_divisible() const;
            const page_range_type& pages() const;
            const row_range_type& rows() const;
            const col_range_type& cols() const;
        };

    } // namespace tbb
} // namespace oneapi

Requirements:

Member types

using page_range_type = blocked_range<PageValue>;

The type of the page values.

using row_range_type = blocked_range<RowValue>;

The type of the row values.

using col_range_type = blocked_range<ColValue>;

The type of the column values.

Member functions

blocked_range3d(PageValue page_begin, PageValue page_end,
    typename page_range_type::size_type page_grainsize,
    RowValue row_begin, RowValue row_end,
    typename row_range_type::size_type row_grainsize,
    ColValue col_begin, ColValue col_end,
    typename col_range_type::size_type col_grainsize);

Effects: Constructs a blocked_range3d representing a three-dimensional space of values. The space is the half-open Cartesian product [page_begin, page_end) x [row_begin, row_end) x [col_begin, col_end), with the given grain sizes for the pages, rows and columns.

Example: The statement blocked_range3d<int,char,int> r(0, 6, 2, 'a', 'z'+1, 3, 0, 10, 2 ); constructs a three-dimensional space that contains all value pairs of the form (i, j, k), where i ranges from 0 to 6 with a grain size of 2, j ranges from 'a' to 'z' with a grain size of 3, and k ranges from 0 to 9 with a grain size of 2.

blocked_range3d(PageValue page_begin, PageValue page_end,
        RowValue row_begin, RowValue row_end,
        ColValue col_begin, ColValue col_end);

Same as blocked_range3d(page_begin,page_end,1,row_begin,row_end,1,col_begin,col_end,1).

blocked_range3d( blocked_range3d& range, split );

Basic splitting constructor.

Requirements: is_divisible() is true.

Effects: Partitions range into two subranges. The newly constructed blocked_range3d is approximately the second half of the original range, and range is updated to be the remainder. Each subrange has the same grain size as the original range. Splitting is done either by pages, rows, or columns. The choice of which axis to split is intended to cause, after repeated splitting, the subranges to approach the aspect ratio of the respective page, row, and column grain sizes.

blocked_range3d( blocked_range3d& range, proportional_split proportion );

Proportional splitting constructor.

Requirements: is_divisible() is true.

Effects: Partitions range into two subranges in the given proportion across one of its axes. The choice of which axis to split is made in the same way as for the basic splitting constructor; then, proportional splitting is done for the chosen axis. The second axis and the grain sizes for each subrange remain the same as in the original range.

bool empty() const;

Effects: Determines if range is empty.

Returns: pages.empty()||rows().empty()||cols().empty()

bool is_divisible() const;

Effects: Determines if the range can be split into subranges.

Returns: pages().is_divisible()||rows().is_divisible()||cols().is_divisible()

const page_range_type& pages() const;

Returns: Range containing the pages of the value space.

const row_range_type& rows() const;

Returns: Range containing the rows of the value space.

const col_range_type& cols() const;

Returns: Range containing the columns of the value space.

See also:

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