pub enum Empty {
    None,
    Unit,
}
Expand description

A value with no value: None or Unit.

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None

Like Option::None.

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Unit

Like ().

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impl Empty

pub fn to_actual(&self) -> Actual

Converts self into an Actual.

Example
use figment::{value::Empty, error::Actual};

assert_eq!(Empty::None.to_actual(), Actual::Option);
assert_eq!(Empty::Unit.to_actual(), Actual::Unit);

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impl Clone for Empty

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fn clone(&self) -> Empty

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
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impl Debug for Empty

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

Formats the value using the given formatter. Read more
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impl<'de> Deserializer<'de> for Empty

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type Error = Error

The error type that can be returned if some error occurs during deserialization.
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fn deserialize_any<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, Error>where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input. Read more
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fn deserialize_bool<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.
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fn deserialize_u8<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.
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fn deserialize_u16<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.
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fn deserialize_u32<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.
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fn deserialize_u64<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.
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fn deserialize_i8<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.
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fn deserialize_i16<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.
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fn deserialize_i32<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.
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fn deserialize_i64<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.
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fn deserialize_f32<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.
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fn deserialize_f64<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.
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fn deserialize_char<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.
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fn deserialize_str<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
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fn deserialize_string<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
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fn deserialize_seq<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.
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fn deserialize_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.
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fn deserialize_bytes<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer. Read more
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fn deserialize_byte_buf<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer. Read more
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fn deserialize_map<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.
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fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.
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fn deserialize_unit<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.
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fn deserialize_newtype_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.
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fn deserialize_ignored_any<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored. Read more
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fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.
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fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.
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fn deserialize_tuple<V>( self, len: usize, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.
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fn deserialize_option<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value. Read more
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fn deserialize_identifier<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Empty as Deserializer<'de>>::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.
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fn deserialize_i128<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value. Read more
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fn deserialize_u128<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, Self::Error>where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value. Read more
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fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form. Read more
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impl From<Empty> for Value

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fn from(value: Empty) -> Value

Converts to this type from the input type.
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impl PartialEq for Empty

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fn eq(&self, other: &Empty) -> 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.
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impl Serialize for Empty

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

Serialize this value into the given Serde serializer. Read more
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impl Copy for Empty

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impl StructuralPartialEq for Empty

Auto Trait Implementations§

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impl RefUnwindSafe for Empty

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impl Send for Empty

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impl Sync for Empty

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impl Unpin for Empty

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impl UnwindSafe for Empty

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<'a, T> AsTaggedExplicit<'a> for Twhere T: 'a,

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self>

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fn implicit( self, class: Class, constructed: bool, tag: u32 ) -> TaggedParser<'a, Implicit, Self>

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Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Conv for T

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fn conv<T>(self) -> Twhere Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<Choices> CoproductSubsetter<CNil, HNil> for Choices

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type Remainder = Choices

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Extract a subset of the possible types in a coproduct (or get the remaining possibilities) Read more
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fn fmt_binary(self) -> FmtBinary<Self>where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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fn fmt_upper_exp(self) -> FmtUpperExp<Self>where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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fn fmt_upper_hex(self) -> FmtUpperHex<Self>where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>where &'a Self: for<'a> IntoIterator,

Formats each item in a sequence. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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Calls U::from(self).

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Converts self into a collection.
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fn into_sql<T>(self) -> Self::Expressionwhere Self: AsExpression<T> + Sized, T: SqlType + TypedExpressionType,

Convert self to an expression for Diesel’s query builder. Read more
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fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expressionwhere &'a Self: AsExpression<T>, T: SqlType + TypedExpressionType,

Convert &self to an expression for Diesel’s query builder. Read more
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impl<T, U, I> LiftInto<U, I> for Twhere U: LiftFrom<T, I>,

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Performs the indexed conversion.
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Returns a styled value derived from self with the foreground set to value.

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Returns self with the fg() set to [Color::Fixed].

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Returns self with the fg() set to [Color::Black].

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Returns self with the fg() set to [Color::Red].

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Returns self with the fg() set to [Color::Green].

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Returns a styled value derived from self with the background set to value.

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fn on_black(&self) -> Painted<&T>

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Returns self with the bg() set to [Color::BrightBlue].

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Returns self with the bg() set to [Color::BrightMagenta].

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Returns self with the bg() set to [Color::BrightWhite].

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Enables the styling [Attribute] value.

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Enables the yansi [Quirk] value.

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Conditionally enable styling based on whether the [Condition] value applies. Replaces any previous condition.

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Enable styling painted only when both stdout and stderr are TTYs:

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Apply a style wholesale to self. Any previous style is replaced. Read more
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Borrows self and passes that borrow into the pipe function. Read more
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Mutably borrows self and passes that borrow into the pipe function. Read more
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Borrows self, then passes self.borrow() into the pipe function. Read more
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fn pipe_borrow_mut<'a, B, R>( &'a mut self, func: impl FnOnce(&'a mut B) -> R ) -> Rwhere Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> Rwhere Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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fn pipe_as_mut<'a, U, R>(&'a mut self, func: impl FnOnce(&'a mut U) -> R) -> Rwhere Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> Rwhere Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R ) -> Rwhere Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, Conn> RunQueryDsl<Conn> for T

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fn execute<'query, 'conn>( self, conn: &'conn mut Conn ) -> <Conn as AsyncConnection>::ExecuteFuture<'conn, 'query>where Conn: AsyncConnection + Send, Self: ExecuteDsl<Conn> + 'query,

Executes the given command, returning the number of rows affected. Read more
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fn load<'query, U, 'conn>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U>>>where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a Vec with the returned rows. Read more
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fn load_stream<'conn, 'query, U>( self, conn: &'conn mut Conn ) -> Self::LoadFuture<'conn>where Conn: AsyncConnection, U: 'conn, Self: LoadQuery<'query, Conn, U> + 'query,

Executes the given query, returning a [Stream] with the returned rows. Read more
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fn get_result<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: Self::Stream<'conn>) -> Map<StreamFuture<Pin<Box<Self::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<Self::Stream<'conn>>>)) -> Result<U, Error>>>where U: Send + 'conn, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, and returns the affected row. Read more
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fn get_results<'query, U, 'conn>( self, conn: &'conn mut Conn ) -> AndThen<Self::LoadFuture<'conn>, TryCollect<Self::Stream<'conn>, Vec<U>>, fn(_: Self::Stream<'conn>) -> TryCollect<Self::Stream<'conn>, Vec<U>>>where U: Send, Conn: AsyncConnection, Self: LoadQuery<'query, Conn, U> + 'query,

Runs the command, returning an Vec with the affected rows. Read more
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fn first<'query, 'conn, U>( self, conn: &'conn mut Conn ) -> AndThen<<Self::Output as LoadQuery<'query, Conn, U>>::LoadFuture<'conn>, Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>, fn(_: <Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>) -> Map<StreamFuture<Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>>, fn(_: (Option<Result<U, Error>>, Pin<Box<<Self::Output as LoadQuery<'query, Conn, U>>::Stream<'conn>>>)) -> Result<U, Error>>>where U: Send + 'conn, Conn: AsyncConnection, Self: LimitDsl, Self::Output: LoadQuery<'query, Conn, U> + Send + 'query,

Attempts to load a single record. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<Source> Sculptor<HNil, HNil> for Source

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type Remainder = Source

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fn sculpt(self) -> (HNil, <Source as Sculptor<HNil, HNil>>::Remainder)

Consumes the current HList and returns an HList with the requested shape. Read more
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Selfwhere Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Selfwhere Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Selfwhere Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Selfwhere Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Selfwhere Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Selfwhere Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more