Trait FromValue 

pub trait FromValue: Sized {
    // Required method
    fn from_value(val: Value) -> Option<Self>;
}

Trait for creating value from a Value.

Typically each implementation can create a value from the specific type. For example, values of type bool or u32 are both represented by I32 and f64 values are represented by F64.

Required Methods

fn from_value(val: Value) -> Option<Self>

Create a value of type Self from a given Value.

Returns None if the Value is of type different than expected by the conversion in question.

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.

Implementations on Foreign Types

impl FromValue for bool

This conversion assumes that boolean values are represented by I32 type.

fn from_value(val: Value) -> Option<bool>

impl FromValue for i8

This conversion assumes that i8 is represented as an I32.

fn from_value(val: Value) -> Option<i8>

impl FromValue for i16

This conversion assumes that i16 is represented as an I32.

fn from_value(val: Value) -> Option<i16>

impl FromValue for i32

fn from_value(val: Value) -> Option<i32>

impl FromValue for i64

fn from_value(val: Value) -> Option<i64>

impl FromValue for u8

This conversion assumes that u8 is represented as an I32.

fn from_value(val: Value) -> Option<u8>

impl FromValue for u16

This conversion assumes that u16 is represented as an I32.

fn from_value(val: Value) -> Option<u16>

impl FromValue for u32

fn from_value(val: Value) -> Option<u32>

impl FromValue for u64

fn from_value(val: Value) -> Option<u64>

Implementors

impl FromValue for F32

impl FromValue for F64