109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/*
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Copyright (c) 2005-2017 Intel Corporation
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef __TBB_blocked_range2d_H
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#define __TBB_blocked_range2d_H
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#include "tbb_stddef.h"
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#include "blocked_range.h"
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namespace tbb {
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//! A 2-dimensional range that models the Range concept.
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/** @ingroup algorithms */
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template<typename RowValue, typename ColValue=RowValue>
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class blocked_range2d {
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public:
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//! Type for size of an iteration range
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typedef blocked_range<RowValue> row_range_type;
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typedef blocked_range<ColValue> col_range_type;
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private:
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row_range_type my_rows;
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col_range_type my_cols;
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public:
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blocked_range2d( RowValue row_begin, RowValue row_end, typename row_range_type::size_type row_grainsize,
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ColValue col_begin, ColValue col_end, typename col_range_type::size_type col_grainsize ) :
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my_rows(row_begin,row_end,row_grainsize),
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my_cols(col_begin,col_end,col_grainsize)
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{
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}
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blocked_range2d( RowValue row_begin, RowValue row_end,
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ColValue col_begin, ColValue col_end ) :
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my_rows(row_begin,row_end),
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my_cols(col_begin,col_end)
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{
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}
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//! True if range is empty
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bool empty() const {
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// Yes, it is a logical OR here, not AND.
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return my_rows.empty() || my_cols.empty();
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}
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//! True if range is divisible into two pieces.
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bool is_divisible() const {
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return my_rows.is_divisible() || my_cols.is_divisible();
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}
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blocked_range2d( blocked_range2d& r, split ) :
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my_rows(r.my_rows),
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my_cols(r.my_cols)
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{
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split split_obj;
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do_split(r, split_obj);
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}
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#if __TBB_USE_PROPORTIONAL_SPLIT_IN_BLOCKED_RANGES
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//! Static field to support proportional split
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static const bool is_splittable_in_proportion = true;
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blocked_range2d( blocked_range2d& r, proportional_split& proportion ) :
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my_rows(r.my_rows),
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my_cols(r.my_cols)
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{
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do_split(r, proportion);
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}
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#endif /* __TBB_USE_PROPORTIONAL_SPLIT_IN_BLOCKED_RANGES */
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template <typename Split>
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void do_split( blocked_range2d& r, Split& split_obj )
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{
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if( my_rows.size()*double(my_cols.grainsize()) < my_cols.size()*double(my_rows.grainsize()) ) {
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my_cols.my_begin = col_range_type::do_split(r.my_cols, split_obj);
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} else {
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my_rows.my_begin = row_range_type::do_split(r.my_rows, split_obj);
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}
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}
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//! The rows of the iteration space
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const row_range_type& rows() const {return my_rows;}
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//! The columns of the iteration space
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const col_range_type& cols() const {return my_cols;}
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};
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} // namespace tbb
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#endif /* __TBB_blocked_range2d_H */
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