Trait Environment
pub trait Environment: Clone {
type AccountId: 'static + Codec + MaxEncodedLen + CodecAsType + Clone + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>;
type Balance: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + Into<U256> + FromLittleEndian;
type Hash: 'static + Codec + MaxEncodedLen + CodecAsType + Copy + Clone + Clear + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>;
type Timestamp: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian;
type BlockNumber: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian;
type ChainExtension;
type EventRecord: 'static + Codec;
const MAX_EVENT_TOPICS: usize;
const NATIVE_TO_ETH_RATIO: u32;
// Provided method
fn native_to_eth(value: Self::Balance) -> U256 { ... }
}
Expand description
The environmental types usable by contracts defined with ink!.
Required Associated Constants§
const MAX_EVENT_TOPICS: usize
const MAX_EVENT_TOPICS: usize
The maximum number of supported event topics provided by the runtime.
The value must match the maximum number of supported event topics of the used runtime.
const NATIVE_TO_ETH_RATIO: u32
const NATIVE_TO_ETH_RATIO: u32
The ratio between the decimal representation of the native Balance
token
and the ETH token.
Required Associated Types§
type AccountId: 'static + Codec + MaxEncodedLen + CodecAsType + Clone + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>
type AccountId: 'static + Codec + MaxEncodedLen + CodecAsType + Clone + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>
The account id type.
type Balance: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + Into<U256> + FromLittleEndian
type Balance: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + Into<U256> + FromLittleEndian
The type of balances.
type Hash: 'static + Codec + MaxEncodedLen + CodecAsType + Copy + Clone + Clear + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>
type Hash: 'static + Codec + MaxEncodedLen + CodecAsType + Copy + Clone + Clear + PartialEq + Eq + Ord + AsRef<[u8]> + AsMut<[u8]>
The type of hash.
type Timestamp: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian
type Timestamp: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian
The type of a timestamp.
type BlockNumber: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian
type BlockNumber: 'static + Codec + CodecAsType + Copy + Clone + PartialEq + Eq + AtLeast32BitUnsigned + FromLittleEndian
The type of block number.
type ChainExtension
type ChainExtension
The chain extension for the environment.
This is a type that is defined through the #[ink::chain_extension]
procedural
macro. For more information about usage and definition click
this link.
type EventRecord: 'static + Codec
type EventRecord: 'static + Codec
TODO comment
Provided Methods§
fn native_to_eth(value: Self::Balance) -> U256
fn native_to_eth(value: Self::Balance) -> U256
Converts from the generic Balance
type to the Ethereum native U256
.
§Developer Note
pallet-revive
uses both types, hence we have to convert in between them
for certain functions. Notice that precision loss might occur when converting
the other way (from U256
to Balance
).
See https://github.com/paritytech/polkadot-sdk/pull/9101 for more details.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.