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Intel Threading Building Blocks
book

Intel Threading Building Blocks

by James Reinders
July 2007
Intermediate to advanced content levelIntermediate to advanced
332 pages
10h 4m
English
O'Reilly Media, Inc.
Content preview from Intel Threading Building Blocks

Name

blocked_range<Value> Template Class — Template class for a recursively divisible half-open interval.

Synopsis

#include "tbb/blocked_range.h"

template<typename Value> class blocked_range;

Description

A blocked_range<Value> represents a half-open range [i,j) that can be recursively split. The types i and j must model the requirements in Table 3-3. Because the requirements are pseudosignatures, signatures that differ in ways that can be implicitly converted are allowed. For example, a blocked_range<int> is allowed because the difference of two int values can be implicitly converted to a size_t. Examples that model the Value requirements are integral types, pointers, and STL random-access iterators whose difference can be implicitly converted to a size_t.

A blocked_range models the Range Concept.

Table 3-3. Value Concept for block_range

Pseudosignature

Semantics

Value::Value( const Value& )

Copy constructor

Value::~Value()

Destructor

bool operator<( const Value& i, const Value& j )

Value i precedes value j

size_t operator-( const Value& i, const Value& j )

Number of values in range [i,j)

Value operator+( const Value& i, size_t k )

kth value after i

A blocked_range<Value> specifies a grainsize of type size_t. A blocked_range is splittable into two subranges if the size of the range exceeds grainsize. The ideal grain size depends upon the context of the blocked_range<Value>, which is typically the range argument to the loop templates parallel_for, parallel_reduce

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Publisher Resources

ISBN: 9780596514808Errata Page