Trait sp_runtime_interface::host::FromFFIValue

pub trait FromFFIValue: RIType {
    type SelfInstance;

    // Required method
    fn from_ffi_value(
        context: &mut dyn FunctionContext,
        arg: Self::FFIType
    ) -> Result<Self::SelfInstance>;
}

Something that can be created from a ffi value. Implementations are safe to assume that the arg given to from_ffi_value is only generated by the corresponding wasm::IntoFFIValue implementation.

Required Associated Types

type SelfInstance

As Self can be an unsized type, it needs to be represented by a sized type at the host. This SelfInstance is the sized type.

Required Methods

fn from_ffi_value( context: &mut dyn FunctionContext, arg: Self::FFIType ) -> Result<Self::SelfInstance>

Create SelfInstance from the given

Implementations on Foreign Types

impl<T: 'static + Decode> FromFFIValue for [T]

type SelfInstance = Vec<T, Global>

fn from_ffi_value(context: &mut dyn FunctionContext, arg: u64) -> Result<Vec<T>>

impl FromFFIValue for i8

type SelfInstance = i8

fn from_ffi_value(_: &mut dyn FunctionContext, arg: i32) -> Result<i8>

impl<const N: usize> FromFFIValue for [u8; N]

type SelfInstance = [u8; N]

fn from_ffi_value( context: &mut dyn FunctionContext, arg: u32 ) -> Result<[u8; N]>

impl FromFFIValue for i16

type SelfInstance = i16

fn from_ffi_value(_: &mut dyn FunctionContext, arg: i32) -> Result<i16>

impl FromFFIValue for u8

type SelfInstance = u8

fn from_ffi_value(_: &mut dyn FunctionContext, arg: u32) -> Result<u8>

impl FromFFIValue for u16

type SelfInstance = u16

fn from_ffi_value(_: &mut dyn FunctionContext, arg: u32) -> Result<u16>

impl FromFFIValue for u32

type SelfInstance = u32

fn from_ffi_value(_: &mut dyn FunctionContext, arg: u32) -> Result<u32>

impl FromFFIValue for u64

type SelfInstance = u64

fn from_ffi_value(_: &mut dyn FunctionContext, arg: u64) -> Result<u64>

impl<T: 'static + Decode> FromFFIValue for Vec<T>

type SelfInstance = Vec<T, Global>

fn from_ffi_value(context: &mut dyn FunctionContext, arg: u64) -> Result<Vec<T>>

impl FromFFIValue for i64

type SelfInstance = i64

fn from_ffi_value(_: &mut dyn FunctionContext, arg: i64) -> Result<i64>

impl FromFFIValue for str

type SelfInstance = String

fn from_ffi_value(context: &mut dyn FunctionContext, arg: u64) -> Result<String>

impl FromFFIValue for u128

type SelfInstance = u128

fn from_ffi_value(context: &mut dyn FunctionContext, arg: u32) -> Result<u128>

impl FromFFIValue for i128

type SelfInstance = i128

fn from_ffi_value(context: &mut dyn FunctionContext, arg: u32) -> Result<i128>

impl FromFFIValue for i32

type SelfInstance = i32

fn from_ffi_value(_: &mut dyn FunctionContext, arg: i32) -> Result<i32>

impl FromFFIValue for bool

type SelfInstance = bool

fn from_ffi_value(_: &mut dyn FunctionContext, arg: u32) -> Result<bool>

Implementors

impl<T: PointerType> FromFFIValue for Pointer<T>

type SelfInstance = Pointer<T>

impl<T: PassBy> FromFFIValue for T

type SelfInstance = T