Enum Value 

pub enum Value {
    U8(u8),
    U16(u16),
    U32(u32),
    U64(u64),
    I8(i8),
    I16(i16),
    I32(i32),
    I64(i64),
    F16(f16),
    F32(f32),
    F64(f64),
}

Typed data value

This enum supports all the data types that can be exchanged with the Crazyflie using the log and param subsystems.

A function allows to convert a [u8] to a Value and the Into<Vec<u8>> trait is implemented to convert a Value into a vector of bytes.

The TryFrom trait is implemented for all matching rust primitive type. There is only direct conversion implemented. For example the following is OK:

let v:u32 = Value::U32(42).try_into().unwrap();

However the following will panic:

let v:u32 = Value::U8(42).try_into().unwrap();

Variants

U8(u8)

u8 value

U16(u16)

u16 value

U32(u32)

u32 value

U64(u64)

u64 value

I8(i8)

i8 value

I16(i16)

i16 value

I32(i32)

i32 value

I64(i64)

i64 value

F16(f16)

f16 value

F32(f32)

f32 value

F64(f64)

f64 value

Implementations

impl Value

pub fn from_le_bytes( bytes: &[u8], value_type: ValueType, ) -> Result<Value, Error>

Convert a &[u8] slice to a Value. The length of the slice must match the length of the value type, otherwise an error will be returned.

pub fn to_f64_lossy(&self) -> f64

Convert a Value to a f64.

This conversion is lossless in most case but can be lossy if the value is a u64: a f64 cannot accurately store large values of a u64.

pub fn from_f64_lossy(value_type: ValueType, value: f64) -> Value

Make a Value from a f64 and a ValueType

This function allows to construct any type of value from a f64.

The conversion has possibility to be lossy in a couple of cases:

• When making an integer, the value is truncated to the number of bit of the parameter
  • Example: Setting 257 to a u8 variable will set it to the value 1
• Similarly floating point precision will be truncated to the parameter precision. Rounding is undefined.
• Making a floating point outside the range of the parameter is undefined.
• It is not possible to represent accurately a u64 parameter in a f64.

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Value

impl Debug for Value

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Value

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<Value> for ValueType

fn from(value: Value) -> Self

Converts to this type from the input type.

impl From<Value> for Vec<u8>

fn from(value: Value) -> Self

Converts to this type from the input type.

impl From<f16> for Value

fn from(v: f16) -> Self

Converts to this type from the input type.

impl From<f32> for Value

fn from(v: f32) -> Self

Converts to this type from the input type.

impl From<f64> for Value

fn from(v: f64) -> Self

Converts to this type from the input type.

impl From<i8> for Value

fn from(v: i8) -> Self

Converts to this type from the input type.

impl From<i16> for Value

fn from(v: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Value

fn from(v: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Value

fn from(v: i64) -> Self

Converts to this type from the input type.

impl From<u8> for Value

fn from(v: u8) -> Self

Converts to this type from the input type.

impl From<u16> for Value

fn from(v: u16) -> Self

Converts to this type from the input type.

impl From<u32> for Value

fn from(v: u32) -> Self

Converts to this type from the input type.

impl From<u64> for Value

fn from(v: u64) -> Self

Converts to this type from the input type.

impl Serialize for Value

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<Value> for u8

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<u8, Self::Error>

Performs the conversion.

impl TryFrom<Value> for u16

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<u16, Self::Error>

Performs the conversion.

impl TryFrom<Value> for u32

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<u32, Self::Error>

Performs the conversion.

impl TryFrom<Value> for u64

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<u64, Self::Error>

Performs the conversion.

impl TryFrom<Value> for i8

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<i8, Self::Error>

Performs the conversion.

impl TryFrom<Value> for i16

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<i16, Self::Error>

Performs the conversion.

impl TryFrom<Value> for i32

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<i32, Self::Error>

Performs the conversion.

impl TryFrom<Value> for i64

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<i64, Self::Error>

Performs the conversion.

impl TryFrom<Value> for f16

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<f16, Self::Error>

Performs the conversion.

impl TryFrom<Value> for f32

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<f32, Self::Error>

Performs the conversion.

impl TryFrom<Value> for f64

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: Value) -> Result<f64, Self::Error>

Performs the conversion.