nimbus-eth1/nimbus/db/aristo/aristo_vid.nim

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Nim

# nimbus-eth1
# Copyright (c) 2023-2024 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
# http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
# http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed
# except according to those terms.
## Handle vertex IDs on the layered Aristo DB delta architecture
## =============================================================
##
{.push raises: [].}
import
std/typetraits,
./aristo_desc
# ------------------------------------------------------------------------------
# Public functions
# ------------------------------------------------------------------------------
proc vidFetch*(db: AristoDbRef): VertexID =
## Fetch next vertex ID.
##
if db.top.delta.vTop == 0:
db.top.delta.vTop = VertexID(LEAST_FREE_VID)
else:
db.top.delta.vTop.inc
db.top.delta.vTop
proc vidDispose*(db: AristoDbRef; vid: VertexID) =
## Only top vertexIDs are disposed
if vid == db.top.delta.vTop and
LEAST_FREE_VID < db.top.delta.vTop.distinctBase:
db.top.delta.vTop.dec
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------