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