47 lines
1.4 KiB
Nim
47 lines
1.4 KiB
Nim
# nimbus-eth1
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# Copyright (c) 2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed
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# except according to those terms.
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## Backend or cascaded constructors for Aristo DB
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## ==============================================
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##
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## For a backend-less constructor use `AristoDbRef.new()`
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{.push raises: [].}
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import
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./aristo_init/[aristo_memory],
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./aristo_desc
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc init*(T: type AristoDbRef): T =
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## Constructor with memory backend.
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T(cascaded: false, backend: memoryBackend())
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proc init*(T: type AristoDbRef; db: T): T =
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## Cascaded constructor, a new layer is pushed and returned.
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result = T(
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cascaded: true,
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lRoot: db.lRoot,
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vGen: db.vGen,
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stack: db)
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if db.cascaded:
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result.level = db.level + 1
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result.base = db.base
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else:
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result.level = 1
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result.base = db
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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