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guide: validation data refactoring (#1576)

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* guide: validation data refactoring

* address grumbles from review

* Update roadmap/implementers-guide/src/types/candidate.md

Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>

* last comments from review

Co-authored-by: Sergei Shulepov <sergei@parity.io>
Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
This commit is contained in:
Robert Habermeier
2020-08-13 16:22:13 +02:00
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parent 57aef8eef5
commit 2a96c19370
15 changed files with 106 additions and 114 deletions
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polkadot/roadmap/implementers-guide/src/runtime-api/persisted-validation-data.md
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# Persisted Validation Data
Yields the [`PersistedValidationData`](../types/candidate.md#persistedvalidationdata) for the given [`ParaId`](../types/candidate.md#paraid) along with an assumption that should be used if the para currently occupies a core:
```rust
/// Returns the persisted validation data for the given para and occupied core assumption.
///
/// Returns `None` if either the para is not registered or the assumption is `Freed`
/// and the para already occupies a core.
fn persisted_validation_data(at: Block, ParaId, OccupiedCoreAssumption) -> Option<PersistedValidationData>;
```