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#pragma once
#include <ATen/core/IListRef.h>
#include <ATen/core/Tensor.h>
#include <c10/core/DeviceGuard.h>
#include <c10/core/ScalarType.h> // TensorList whyyyyy
namespace at {
// Are you here because you're wondering why DeviceGuard(tensor) no
// longer works? For code organization reasons, we have temporarily(?)
// removed this constructor from DeviceGuard. The new way to
// spell it is:
//
// OptionalDeviceGuard guard(device_of(tensor));
/// Return the Device of a Tensor, if the Tensor is defined.
inline c10::optional<Device> device_of(const Tensor& t) {
if (t.defined()) {
return c10::make_optional(t.device());
} else {
return c10::nullopt;
}
}
inline c10::optional<Device> device_of(const c10::optional<Tensor>& t) {
return t.has_value() ? device_of(t.value()) : c10::nullopt;
}
/// Return the Device of a TensorList, if the list is non-empty and
/// the first Tensor is defined. (This function implicitly assumes
/// that all tensors in the list have the same device.)
inline c10::optional<Device> device_of(ITensorListRef t) {
if (!t.empty()) {
return device_of(t.front());
} else {
return c10::nullopt;
}
}
} // namespace at
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