Developer Guide and Reference

Contents

index_d template function

Syntax

template<int DimensionT, typename ObjT> auto index_d(const ObjT &a_obj)
Description
The template function offers a consistent way to determine the index of a dimension for a multi-dimensional object. It can avoid extracting an entire
n_index_t<…>
when only the extent of a single dimension is needed.
Template Argument
Description
int DimensionT
0 based index starting at the leftmost dimension indicating which n-dimensions to query the index of.
Requirements:
DimensionT >=0 and DimensionT < ObjT::rank
typename ObjT
The type of n-dimensional object from which to retrieve the extent.
Requirements:
ObtT is one of:
n_index_t<…>
n_index_generator<…>
Returns
The correctly typed index corresponding to the requested DimensionT of a_obj.
Example
template <typename IndicesT> void foo(const IndicesT & a_pos) { int z = index_d<0>(a_pos); int y = index_d<1>(a_pos); int x = index_d<2>(a_pos); /… }

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.