Struct casper_execution_engine::shared::host_function_costs::HostFunction

impl<T> HostFunction<T>

pub const fn new(cost: Cost, arguments: T) -> Self

Creates a new instance of HostFunction with a fixed call cost and argument weights.

pub fn cost(&self) -> Cost

Returns the base gas fee for calling the host function.

impl<T> HostFunction<T>
where T: Default,

pub fn fixed(cost: Cost) -> Self

Creates a new fixed host function cost with argument weights of zero.

impl<T> HostFunction<T>
where T: AsRef<[Cost]>,

pub fn arguments(&self) -> &[Cost]

Returns a slice containing the argument weights.

pub fn calculate_gas_cost(&self, weights: T) -> Gas

Calculate gas cost for a host function

Trait Implementations§

impl<T: Clone> Clone for HostFunction<T>

fn clone(&self) -> HostFunction<T>

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

impl<T> DataSize for HostFunction<T>
where T: DataSize,

const IS_DYNAMIC: bool = _

If true, the type has a heap size that can vary at runtime, depending on the actual value.

const STATIC_HEAP_SIZE: usize = _

The amount of space a value of the type always occupies. If IS_DYNAMIC is false, this is the total amount of heap memory occupied by the value. Otherwise this is a lower bound.

fn estimate_heap_size(&self) -> usize

Estimates the size of heap memory taken up by this value. Read more

impl<T: Debug> Debug for HostFunction<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

impl<T> Default for HostFunction<T>
where T: Default,

fn default() -> Self

Returns the “default value” for a type. Read more

impl<'de, T> Deserialize<'de> for HostFunction<T>
where T: Deserialize<'de>,

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more

impl<T> Distribution<HostFunction<T>> for Standard
where Standard: Distribution<T>, T: AsRef<[Cost]>,

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> HostFunction<T>

Generate a random value of T, using rng as the source of randomness.

fn sample_iter<R>(self, rng: R) -> DistIter<Self, R, T>
where R: Rng, Self: Sized,

Create an iterator that generates random values of T, using rng as the source of randomness. Read more

fn map<F, S>(self, func: F) -> DistMap<Self, F, T, S>
where F: Fn(T) -> S, Self: Sized,

Create a distribution of values of ‘S’ by mapping the output of Self through the closure F Read more

impl<T> FromBytes for HostFunction<T>
where T: Default + AsMut<[Cost]>,

fn from_bytes(bytes: &[u8]) -> Result<(Self, &[u8]), Error>

Deserializes the slice into Self.

fn from_vec(bytes: Vec<u8>) -> Result<(Self, Vec<u8>), Error>

Deserializes the Vec<u8> into Self.

impl<T: PartialEq> PartialEq for HostFunction<T>

fn eq(&self, other: &HostFunction<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.

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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> Serialize for HostFunction<T>
where T: Serialize,

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more

impl<T> ToBytes for HostFunction<T>
where T: AsRef<[Cost]>,

fn to_bytes(&self) -> Result<Vec<u8>, Error>

Serializes &self to a Vec<u8>.

fn serialized_length(&self) -> usize

Returns the length of the Vec<u8> which would be returned from a successful call to to_bytes() or into_bytes(). The data is not actually serialized, so this call is relatively cheap.

fn into_bytes(self) -> Result<Vec<u8>, Error>
where Self: Sized,

Consumes self and serializes to a Vec<u8>.

fn write_bytes(&self, writer: &mut Vec<u8>) -> Result<(), Error>

Writes &self into a mutable writer.

impl<T: Copy> Copy for HostFunction<T>

impl<T: Eq> Eq for HostFunction<T>

impl<T> StructuralPartialEq for HostFunction<T>

Auto Trait Implementations§

impl<T> UnwindSafe for HostFunction<T>
where T: UnwindSafe,

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> Downcast for T
where T: Any,

fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.

fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.

fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.

impl<T> DowncastSync for T
where T: Any + Send + Sync,

fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Sync + Send>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.