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Add a linspace-like function in AMReX_Algorithm.H #3698

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merged 5 commits into from
Jan 16, 2024
Merged

Add a linspace-like function in AMReX_Algorithm.H #3698

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1c34415
add linspace function
lucafedeli88 Jan 15, 2024
74a3bcf
use std::ptrdff_t instead of int
lucafedeli88 Jan 16, 2024
74cd264
ensure that floating point numbers are used
lucafedeli88 Jan 16, 2024
12ec590
use iterator_traits
lucafedeli88 Jan 16, 2024
2537c7a
fix bug
lucafedeli88 Jan 16, 2024
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18 changes: 18 additions & 0 deletions Src/Base/AMReX_Algorithm.H
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,24 @@ namespace amrex
#endif
}

template<typename ItType, typename ValType,
typename std::enable_if<
std::is_floating_point<typename std::iterator_traits<ItType>::value_type>::value &&
std::is_floating_point<ValType>::value,
int>::type = 0>
AMREX_GPU_HOST_DEVICE
void linspace (ItType first, const ItType& last, const ValType& start, const ValType& stop)
{
const std::ptrdiff_t count = last-first;
if (count >= 2){
const auto delta = (stop - start)/(count - 1);
for (std::ptrdiff_t i = 0; i < count-1; ++i){
*(first++) = start + i*delta;
}
*first = stop;
}
}

namespace detail {

struct clzll_tag {};
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