Trait Value 

pub trait Value:
    Any
    + AsAny
    + Debug
    + Send
    + Sync {
    // Required methods
    fn type_name() -> Cow<'static, str>
       where Self: Sized;
    fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>
       where Self: Sized;
    fn format(&self) -> String;
    fn box_clone(&self) -> Box<dyn Value>;

    // Provided method
    fn parse_dyn_value(
        input: VarInput<'_>,
    ) -> Result<Box<dyn Value>, VarParseError>
       where Self: Sized { ... }
}

Defines a value that get stored as part of a System or Session variable.

This trait is partially object safe, see VarDefinition for more details.

Required Methods

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn format(&self) -> String

fn box_clone(&self) -> Box<dyn Value>

Provided Methods

fn parse_dyn_value(input: VarInput<'_>) -> Result<Box<dyn Value>, VarParseError>

where Self: Sized,

Parse an instance of Self from VarInput, returning it as a Box<dyn Value>.

Trait Implementations

impl Eq for Box<dyn Value>

impl<'a> Eq for &'a dyn Value

impl PartialEq for Box<dyn Value>

fn eq(&self, other: &Box<dyn Value>) -> bool

Equality operator ==.

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

Inequality operator !=.

impl<'a> PartialEq for &'a dyn Value

fn eq(&self, other: &&dyn Value) -> bool

Equality operator ==.

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

Inequality operator !=.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl Value for ByteSize

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for CloneableEnvFilter

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for CompactionStyle

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for CompressionType

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Cow<'static, str>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Duration

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for NonZeroU32

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Numeric

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Option<CheckedTimestamp<DateTime<Utc>>>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for String

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Timestamp

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Value

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Vec<Ident>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Vec<IpNet>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for Vec<SerializableDirective>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for bool

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for f64

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for i32

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for u32

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for u64

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl Value for usize

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

impl<V: Value + Clone> Value for Option<V>

fn type_name() -> Cow<'static, str>

where Self: Sized,

fn parse(input: VarInput<'_>) -> Result<Self, VarParseError>

where Self: Sized,

fn box_clone(&self) -> Box<dyn Value>

fn format(&self) -> String

Implementors

impl Value for ClientEncoding

impl Value for ClientSeverity

impl Value for DateStyle

impl Value for Failpoints

impl Value for IntervalStyle

impl Value for IsolationLevel

impl Value for TimeZone