Expand description

Prelude to be used alongside pallet macro, for ease of use.

Re-exports

Macros

  • Evaluate $x:expr and if not true return Err($y:expr).

Structs

  • Hash storage keys with blake2 128
  • Hash storage keys with concat(blake2_128(key), key)
  • Hash storage keys with blake2 256
  • A bounded vector.
  • Const getter for a basic type.
  • A wrapper around a StorageMap and a StorageValue<Value=u32> to keep track of how many items are in a map, without needing to iterate all the values.
  • Implement Get by returning Default for any type that implements Default.
  • Store the key directly.
  • Inherent data to include in a block.
  • A type used exclusively by storage maps as their key type.
  • Zero-sized type used to mark things that “act like” they own a T.
  • A type that allow to store values for (key1, key2) couple. Similar to StorageMap but allow to iterate and remove value associated to first key.
  • A type that allow to store value for given key. Allowing to insert/remove/iterate on values.
  • A type that allow to store values for an arbitrary number of keys in the form of (Key<Hasher1, key1>, Key<Hasher2, key2>, ..., Key<HasherN, keyN>).
  • A type that allow to store a value.
  • The storage version of a pallet.
  • Hash storage keys with concat(twox64(key), key)
  • Hash storage keys with twox 128
  • Hash storage keys with twox 256
  • Information concerning a valid transaction.

Enums

Constants

Traits

  • Trait that allows zero-copy read of value-references from slices in LE format.
  • Trait that allows zero-copy write of value-references to slices in LE format.
  • Some sort of check on the origin is performed by this object.
  • A trait to define the build function of a genesis config, T and I are placeholder for pallet trait and pallet instance.
  • A trait for querying a single value from a type.
  • Provides information about the storage version of a pallet.
  • The pallet hooks trait. Implementing this lets you express some logic to execute.
  • Trait to be used when types are exactly same.
  • Items implementing MaxEncodedLen have a statically known maximum encoded size.
  • A type that implements Serialize, DeserializeOwned and Debug when in std environment or serde feature is activated.
  • A type that can be used in runtime structures.
  • Provides information about the pallet itself and its setup in the runtime.
  • A trait to give information about storage.
  • Implementors return their meta type information.
  • A trait for querying a single value from a type defined in the trait.
  • Provide validation for unsigned extrinsics.

Type Definitions

  • An identifier for an inherent.
  • Minimum number of blocks a transaction will remain valid for. TransactionLongevity::max_value() means “forever”.
  • Priority for a transaction. Additive. Higher is better.
  • Tag for a transaction. No two transactions with the same tag should be placed on-chain.
  • Information on a transaction’s validity and, if valid, on how it relates to other transactions.

Attribute Macros

Derive Macros

  • Derive Clone but do not bound any generic. Docs are at frame_support::CloneNoBound.
  • Derive Debug but do not bound any generics. Docs are at frame_support::DebugNoBound.
  • Derive parity_scale_codec::Decode and for struct and enum.
  • Derive parity_scale_codec::Encode and parity_scale_codec::EncodeLike for struct and enum.
  • derive Eq but do no bound any generic. Docs are at frame_support::EqNoBound.
  • Derive parity_scale_codec::MaxEncodedLen for struct and enum.
  • Derive PartialEq but do not bound any generic. Docs are at frame_support::PartialEqNoBound.
  • Derive [Debug], if std is enabled it uses frame_support::DebugNoBound, if std is not enabled it just returns "<wasm:stripped>". This behaviour is useful to prevent bloating the runtime WASM blob from unneeded code.