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#pragma once
#include <c10/core/MemoryFormat.h>
#include <c10/core/SymIntArrayRef.h>
#include <c10/core/TensorImpl.h>
#include <c10/macros/Export.h>
#include <c10/util/ArrayRef.h>
#include <cstdint>
namespace c10 {
struct C10_API UndefinedTensorImpl final : public TensorImpl {
public:
// Without this, we get:
// error: identifier "at::UndefinedTensorImpl::_singleton" is undefined in
// device code
// (ostensibly because the constexpr tricks MSVC into trying to compile this
// function for device as well).
#ifdef _WIN32
static inline TensorImpl* singleton() {
return &getInstance();
}
#else
static constexpr inline TensorImpl* singleton() {
return &_singleton;
}
#endif
#ifdef DEBUG
bool has_storage() const override;
#endif
void set_storage_offset(int64_t offset) override;
protected:
bool is_contiguous_custom(MemoryFormat format) const override;
IntArrayRef strides_custom() const override;
SymIntArrayRef sym_strides_custom() const override;
private:
UndefinedTensorImpl();
#ifdef _WIN32
static UndefinedTensorImpl& getInstance();
#else
static UndefinedTensorImpl _singleton;
#endif
const char* tensorimpl_type_name() const override;
};
} // namespace c10
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