Generic information about the physical location of data.
Values depend on the concrete storage type. E.g., for a local file fPosition
might be a 64bit file offset. Referenced objects on storage can be compressed and therefore we need to store their actual size. TODO(jblomer): consider moving this to RNTupleDescriptor
Definition at line 196 of file RNTupleUtil.hxx.
Public Types | |
enum | ELocatorType : std::uint8_t { kTypeFile = 0x00 , kTypeURI = 0x01 , kTypeDAOS = 0x02 , kLastSerializableType = 0x7f , kTypePageZero = kLastSerializableType + 1 } |
Values for the Type field in non-disk locators. More... | |
Public Member Functions | |
template<typename T > | |
const T & | GetPosition () const |
bool | operator== (const RNTupleLocator &other) const |
Public Attributes | |
std::uint32_t | fBytesOnStorage = 0 |
std::variant< std::uint64_t, std::string, RNTupleLocatorObject64 > | fPosition {} |
Simple on-disk locators consisting of a 64-bit offset use variant type uint64_t ; extended locators have fPosition.index() > 0. | |
std::uint8_t | fReserved = 0 |
Reserved for use by concrete storage backends. | |
ELocatorType | fType = kTypeFile |
For non-disk locators, the value for the Type field. | |
#include <ROOT/RNTupleUtil.hxx>
enum ROOT::Experimental::RNTupleLocator::ELocatorType : std::uint8_t |
Values for the Type field in non-disk locators.
Serializable types must have the MSb == 0; see doc/specifications.md
for details
Enumerator | |
---|---|
kTypeFile | |
kTypeURI | |
kTypeDAOS | |
kLastSerializableType | |
kTypePageZero |
Definition at line 199 of file RNTupleUtil.hxx.
|
inline |
Definition at line 222 of file RNTupleUtil.hxx.
|
inline |
Definition at line 218 of file RNTupleUtil.hxx.
std::uint32_t ROOT::Experimental::RNTupleLocator::fBytesOnStorage = 0 |
Definition at line 211 of file RNTupleUtil.hxx.
std::variant<std::uint64_t, std::string, RNTupleLocatorObject64> ROOT::Experimental::RNTupleLocator::fPosition {} |
Simple on-disk locators consisting of a 64-bit offset use variant type uint64_t
; extended locators have fPosition.index()
> 0.
Definition at line 210 of file RNTupleUtil.hxx.
std::uint8_t ROOT::Experimental::RNTupleLocator::fReserved = 0 |
Reserved for use by concrete storage backends.
Definition at line 216 of file RNTupleUtil.hxx.
ELocatorType ROOT::Experimental::RNTupleLocator::fType = kTypeFile |
For non-disk locators, the value for the Type field.
This makes it possible to have different type values even if the payload structure is identical.
Definition at line 214 of file RNTupleUtil.hxx.