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Generic state backend#4632
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make state module public
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Feb 25, 2017
| /// | ||
| pub struct State { | ||
| db: StateDB, | ||
| pub struct State<B> { |
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More general > less general. This is a common pattern among e.g. structures in std: constrain the generic parameters only when introducing functionality that depends on those constraints.
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I'd agree if there was some generic functionality, but State is pretty much useless without a backend. Attempting to use it with unsupported type will leave you with a bare struct which does not really represent the State abstraction. I think it would be better to explicitly disallow that.
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Closes #4616.
This is intended to allow us to enact state changes on general databases/caches, rather than just the single
StateDB.Also opens the door to executing EVMs over different account storage models, by moving the trie lookups fully into the backend, which may be done in the future.