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lammps/src/KOKKOS/kokkos_few.h
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kokkos_few.h
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#ifndef KOKKOS_FEW_H
#define KOKKOS_FEW_H
#include <Kokkos_Core.hpp>
template <typename T, std::size_t n>
class Few {
alignas(T) char array_[n * sizeof(T)];
public:
enum { size = n };
Few(std::initializer_list<T> l) {
std::size_t i = 0;
for (auto it = l.begin(); it != l.end(); ++it) {
new (data() + (i++)) T(*it);
}
}
KOKKOS_INLINE_FUNCTION Few(T const a[]) {
for (std::size_t i = 0; i < n; ++i) new (data() + i) T(a[i]);
}
KOKKOS_INLINE_FUNCTION Few() {
for (std::size_t i = 0; i < n; ++i) new (data() + i) T();
}
KOKKOS_INLINE_FUNCTION ~Few() {
for (std::size_t i = 0; i < n; ++i) (data()[i]).~T();
}
KOKKOS_INLINE_FUNCTION Few(Few<T, n> const& rhs) {
for (std::size_t i = 0; i < n; ++i) new (data() + i) T(rhs[i]);
}
KOKKOS_INLINE_FUNCTION Few(Few<T, n> const volatile& rhs) {
for (std::size_t i = 0; i < n; ++i) new (data() + i) T(rhs[i]);
}
KOKKOS_INLINE_FUNCTION void operator=(Few<T, n> const& rhs) volatile {
for (std::size_t i = 0; i < n; ++i) data()[i] = rhs[i];
}
KOKKOS_INLINE_FUNCTION void operator=(Few<T, n> const& rhs) {
for (std::size_t i = 0; i < n; ++i) data()[i] = rhs[i];
}
KOKKOS_INLINE_FUNCTION void operator=(Few<T, n> const volatile& rhs) {
for (std::size_t i = 0; i < n; ++i) data()[i] = rhs[i];
}
KOKKOS_INLINE_FUNCTION T* data() {
return reinterpret_cast<T*>(array_);
}
KOKKOS_INLINE_FUNCTION T const* data() const {
return reinterpret_cast<T const*>(array_);
}
KOKKOS_INLINE_FUNCTION T volatile* data() volatile {
return reinterpret_cast<T volatile*>(array_);
}
KOKKOS_INLINE_FUNCTION T const volatile* data() const volatile {
return reinterpret_cast<T const volatile*>(array_);
}
KOKKOS_INLINE_FUNCTION T& operator[](std::size_t i) {
return data()[i];
}
KOKKOS_INLINE_FUNCTION T const& operator[](std::size_t i) const {
return data()[i];
}
KOKKOS_INLINE_FUNCTION T volatile& operator[](std::size_t i) volatile {
return data()[i];
}
KOKKOS_INLINE_FUNCTION T const volatile& operator[](std::size_t i) const volatile {
return data()[i];
}
};
#endif
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