Struct rocket_dyn_templates::minijinja::Value

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pub struct Value(/* private fields */);
Expand description

Represents a dynamically typed value in the template engine.

Implementations§

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impl Value

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pub const UNDEFINED: Value = _

The undefined value.

This constant exists because the undefined type does not exist in Rust and this is the only way to construct it.

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pub fn from_serialize<T>(value: T) -> Value
where T: Serialize,

Creates a value from something that can be serialized.

This is the method that MiniJinja will generally use whenever a serializable object is passed to one of the APIs that internally want to create a value. For instance this is what context! and render will use.

During serialization of the value, serializing_for_value will return true which makes it possible to customize serialization for MiniJinja. For more information see serializing_for_value.

let val = Value::from_serialize(&vec![1, 2, 3]);

This method does not fail but it might return a value that is not valid. Such values will when operated on fail in the template engine in most situations. This for instance can happen if the underlying implementation of Serialize fails. There are also cases where invalid objects are silently hidden in the engine today. This is for instance the case for when keys are used in hash maps that the engine cannot deal with. Invalid values are considered an implementation detail. There is currently no API to validate a value.

If the deserialization feature is enabled then the inverse of this method is to use the Value type as serializer. You can pass a value into the deserialize method of a type that supports serde deserialization.

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pub fn from_serializable<T>(value: &T) -> Value
where T: Serialize,

👎Deprecated since 1.0.17: this method was replaced by Value::from_serialize

Deprecated original name of Value::from_serialize.

This method was replaced by the more generic method Value::from_serialize which also takes values by either reference or value.

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pub fn make_one_shot_iterator<I, T>(iter: I) -> Value
where I: Iterator<Item = T> + Send + Sync + 'static, T: Into<Value> + Send + Sync + 'static,

Creates a value from an iterator.

This takes an iterator (yielding values that can be turned into a Value) and returns a value that can be iterated over. Today this value looks a bit like a sequence (and will pretend to be one) but this is misleading. Such values are actually objects implementing IteratorObject but due to backwards compatibility reasons it’s not possible to give them a distinct type.

Iterators that implement ExactSizeIterator or have a matching lower and upper bound on the Iterator::size_hint report a known loop.length. Iterators that do not fulfill these requirements will not. The same is true for revindex and similar properties.

let val = Value::make_one_shot_iterator(0..10);
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pub fn from_iterator<I, T>(iter: I) -> Value
where I: Iterator<Item = T> + Send + Sync + 'static, T: Into<Value> + 'static,

👎Deprecated since 1.0.19: this method was replaced by Value::make_one_shot_iterator

Deprecated alternative to Value::make_one_shot_iterator.

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pub fn from_safe_string(value: String) -> Value

Creates a value from a safe string.

A safe string is one that will bypass auto escaping. For instance if you want to have the template engine render some HTML without the user having to supply the |safe filter, you can use a value of this type instead.

let val = Value::from_safe_string("<em>note</em>".into());
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pub fn from_object<T>(value: T) -> Value
where T: Object,

Creates a value from a dynamic object.

For more information see Object.

use std::fmt;

#[derive(Debug)]
struct Thing {
    id: usize,
}

impl fmt::Display for Thing {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}

impl Object for Thing {}

let val = Value::from_object(Thing { id: 42 });

Objects are internally reference counted. If you want to hold on to the Arc you can directly create the value from an arc’ed object:

use std::sync::Arc;
let val = Value::from(Arc::new(Thing { id: 42 }));
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pub fn from_seq_object<T>(value: T) -> Value
where T: SeqObject + 'static,

Creates a value from an owned SeqObject.

This is a simplified API for creating dynamic sequences without having to implement the entire Object protocol.

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pub fn from_struct_object<T>(value: T) -> Value
where T: StructObject + 'static,

Creates a value from an owned StructObject.

This is a simplified API for creating dynamic structs without having to implement the entire Object protocol.

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pub fn from_function<F, Rv, Args>(f: F) -> Value
where F: Function<Rv, Args> + for<'a> Function<Rv, <Args as FunctionArgs<'a>>::Output>, Rv: FunctionResult, Args: for<'a> FunctionArgs<'a>,

Creates a callable value from a function.

let pow = Value::from_function(|a: u32| a * a);
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pub fn kind(&self) -> ValueKind

Returns the kind of the value.

This can be used to determine what’s in the value before trying to perform operations on it.

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pub fn is_number(&self) -> bool

Returns true if the value is a number.

To convert a value into a primitive number, use TryFrom or TryInto.

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pub fn is_kwargs(&self) -> bool

Returns true if the map represents keyword arguments.

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pub fn is_true(&self) -> bool

Is this value true?

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pub fn is_safe(&self) -> bool

Returns true if this value is safe.

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pub fn is_undefined(&self) -> bool

Returns true if this value is undefined.

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pub fn is_none(&self) -> bool

Returns true if this value is none.

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pub fn as_str(&self) -> Option<&str>

If the value is a string, return it.

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pub fn as_bytes(&self) -> Option<&[u8]>

Returns the bytes of this value if they exist.

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pub fn as_object(&self) -> Option<&(dyn Object + 'static)>

If the value is an object, it’s returned as Object.

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pub fn as_seq(&self) -> Option<&dyn SeqObject>

If the value is a sequence it’s returned as SeqObject.

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pub fn as_struct(&self) -> Option<&dyn StructObject>

If the value is a struct, return it as StructObject.

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pub fn len(&self) -> Option<usize>

Returns the length of the contained value.

Values without a length will return None.

let seq = Value::from(vec![1, 2, 3, 4]);
assert_eq!(seq.len(), Some(4));
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pub fn get_attr(&self, key: &str) -> Result<Value, Error>

Looks up an attribute by attribute name.

This this returns UNDEFINED when an invalid key is resolved. An error is returned when if the value does not contain an object that has attributes.

let ctx = minijinja::context! {
    foo => "Foo"
};
let value = ctx.get_attr("foo")?;
assert_eq!(value.to_string(), "Foo");
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pub fn get_item_by_index(&self, idx: usize) -> Result<Value, Error>

Looks up an index of the value.

This is a shortcut for get_item.

let seq = Value::from(vec![0u32, 1, 2]);
let value = seq.get_item_by_index(1).unwrap();
assert_eq!(value.try_into().ok(), Some(1));
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pub fn get_item(&self, key: &Value) -> Result<Value, Error>

Looks up an item (or attribute) by key.

This is similar to get_attr but instead of using a string key this can be any key. For instance this can be used to index into sequences. Like get_attr this returns UNDEFINED when an invalid key is looked up.

let ctx = minijinja::context! {
    foo => "Foo",
};
let value = ctx.get_item(&Value::from("foo")).unwrap();
assert_eq!(value.to_string(), "Foo");
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pub fn try_iter(&self) -> Result<ValueIter<'_>, Error>

Iterates over the value.

Depending on the kind of the value the iterator has a different behavior.

let value = Value::from({
    let mut m = std::collections::BTreeMap::new();
    m.insert("foo", 42);
    m.insert("bar", 23);
    m
});
for key in value.try_iter()? {
    let value = value.get_item(&key)?;
    println!("{} = {}", key, value);
}
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pub fn downcast_object_ref<T>(&self) -> Option<&T>
where T: 'static,

Returns some reference to the boxed object if it is of type T, or None if it isn’t.

This is basically the “reverse” of from_object, from_seq_object and from_struct_object. It’s also a shortcut for downcast_ref on the return value of as_object.

§Example
use std::fmt;

#[derive(Debug)]
struct Thing {
    id: usize,
}

impl fmt::Display for Thing {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Debug::fmt(self, f)
    }
}

impl Object for Thing {}

let x_value = Value::from_object(Thing { id: 42 });
let thing = x_value.downcast_object_ref::<Thing>().unwrap();
assert_eq!(thing.id, 42);

It also works with SeqObject or StructObject:


struct Thing {
    id: usize,
}

impl SeqObject for Thing {
    fn get_item(&self, idx: usize) -> Option<Value> {
        (idx < 3).then(|| Value::from(idx))
    }
    fn item_count(&self) -> usize {
        3
    }
}

let x_value = Value::from_seq_object(Thing { id: 42 });
let thing = x_value.downcast_object_ref::<Thing>().unwrap();
assert_eq!(thing.id, 42);
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pub fn call( &self, state: &State<'_, '_>, args: &[Value] ) -> Result<Value, Error>

Calls the value directly.

If the value holds a function or macro, this invokes it. Note that in MiniJinja there is a separate namespace for methods on objects and callable items. To call methods (which should be a rather rare occurrence) you have to use call_method.

The args slice is for the arguments of the function call. To pass keyword arguments use the Kwargs type.

Usually the state is already available when it’s useful to call this method, but when it’s not available you can get a fresh template state straight from the Template via new_state.

let func = Value::from_function(|v: i64, kwargs: Kwargs| {
    v * kwargs.get::<i64>("mult").unwrap_or(1)
});
let rv = func.call(
    state,
    &[
        Value::from(42),
        Value::from(Kwargs::from_iter([("mult", Value::from(2))])),
    ],
).unwrap();
assert_eq!(rv, Value::from(84));

With the args! macro creating an argument slice is simplified:

let func = Value::from_function(|v: i64, kwargs: Kwargs| {
    v * kwargs.get::<i64>("mult").unwrap_or(1)
});
let rv = func.call(state, args!(42, mult => 2)).unwrap();
assert_eq!(rv, Value::from(84));
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pub fn call_method( &self, state: &State<'_, '_>, name: &str, args: &[Value] ) -> Result<Value, Error>

Calls a method on the value.

The name of the method is name, the arguments passed are in the args slice.

Trait Implementations§

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impl<'a> ArgType<'a> for &Value

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type Output = &'a Value

The output type of this argument.
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impl<'a> ArgType<'a> for Value

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type Output = Value

The output type of this argument.
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impl Clone for Value

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fn clone(&self) -> Value

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 Value

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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 Default for Value

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fn default() -> Value

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for Value

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fn deserialize<D>( deserializer: D ) -> Result<Value, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<'de, 'v> Deserializer<'de> for &'v Value

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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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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, <&'v Value 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_unit<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value as Deserializer<'de>>::Error>
where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.
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fn deserialize_seq<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_bytes<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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, <&'v Value 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, <&'v Value 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_unit_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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, <&'v Value 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_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_tuple<V>( self, len: usize, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_ignored_any<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_identifier<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_option<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_newtype_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <&'v Value 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_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<'de> Deserializer<'de> for Value

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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_option<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, Error>
where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value. Read more
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fn deserialize_enum<V>( self, name: &'static str, variants: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, 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_newtype_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, 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_bool<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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, <Value 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_unit<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value as Deserializer<'de>>::Error>
where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.
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fn deserialize_seq<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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_bytes<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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, <Value 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, <Value 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_unit_struct<V>( self, name: &'static str, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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, <Value 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_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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_tuple<V>( self, len: usize, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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_ignored_any<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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_identifier<V>( self, visitor: V ) -> Result<<V as Visitor<'de>>::Value, <Value 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 Display for Value

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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<'a> From<&'a [u8]> for Value

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fn from(val: &'a [u8]) -> Value

Converts to this type from the input type.
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impl<'a> From<&'a str> for Value

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fn from(val: &'a str) -> Value

Converts to this type from the input type.
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impl From<()> for Value

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fn from(_: ()) -> Value

Converts to this type from the input type.
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impl<T> From<Arc<T>> for Value
where T: Object,

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fn from(object: Arc<T>) -> Value

Converts to this type from the input type.
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impl From<Arc<Vec<Value>>> for Value

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fn from(val: Arc<Vec<Value>>) -> Value

Converts to this type from the input type.
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impl From<Arc<Vec<u8>>> for Value

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fn from(val: Arc<Vec<u8>>) -> Value

Converts to this type from the input type.
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impl From<Arc<dyn Object>> for Value

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fn from(val: Arc<dyn Object>) -> Value

Converts to this type from the input type.
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impl From<Arc<str>> for Value

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fn from(value: Arc<str>) -> Value

Converts to this type from the input type.
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impl<K, V> From<BTreeMap<K, V>> for Value
where K: Into<Value>, V: Into<Value>,

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fn from(val: BTreeMap<K, V>) -> Value

Converts to this type from the input type.
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impl<'a> From<Cow<'a, str>> for Value

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fn from(val: Cow<'a, str>) -> Value

Converts to this type from the input type.
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impl<K, V> From<HashMap<K, V>> for Value
where K: Into<Value>, V: Into<Value>,

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fn from(val: HashMap<K, V>) -> Value

Converts to this type from the input type.
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impl From<Kwargs> for Value

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fn from(value: Kwargs) -> Value

Converts to this type from the input type.
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impl<I> From<Option<I>> for Value
where I: Into<Value>,

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fn from(value: Option<I>) -> Value

Converts to this type from the input type.
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impl From<String> for Value

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fn from(val: String) -> Value

Converts to this type from the input type.
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impl From<ValueRepr> for Value

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fn from(val: ValueRepr) -> Value

Converts to this type from the input type.
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impl<T> From<Vec<T>> for Value
where T: Into<Value>,

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fn from(val: Vec<T>) -> Value

Converts to this type from the input type.
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impl From<bool> for Value

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fn from(val: bool) -> Value

Converts to this type from the input type.
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impl From<char> for Value

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fn from(val: char) -> Value

Converts to this type from the input type.
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impl From<f32> for Value

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fn from(val: f32) -> Value

Converts to this type from the input type.
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impl From<f64> for Value

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fn from(val: f64) -> Value

Converts to this type from the input type.
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impl From<i128> for Value

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fn from(val: i128) -> Value

Converts to this type from the input type.
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impl From<i16> for Value

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fn from(val: i16) -> Value

Converts to this type from the input type.
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impl From<i32> for Value

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fn from(val: i32) -> Value

Converts to this type from the input type.
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impl From<i64> for Value

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fn from(val: i64) -> Value

Converts to this type from the input type.
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impl From<i8> for Value

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fn from(val: i8) -> Value

Converts to this type from the input type.
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impl From<u128> for Value

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fn from(val: u128) -> Value

Converts to this type from the input type.
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impl From<u16> for Value

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fn from(val: u16) -> Value

Converts to this type from the input type.
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impl From<u32> for Value

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fn from(val: u32) -> Value

Converts to this type from the input type.
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impl From<u64> for Value

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fn from(val: u64) -> Value

Converts to this type from the input type.
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impl From<u8> for Value

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fn from(val: u8) -> Value

Converts to this type from the input type.
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impl From<usize> for Value

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fn from(val: usize) -> Value

Converts to this type from the input type.
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impl<K, V> FromIterator<(K, V)> for Value
where K: Into<Value>, V: Into<Value>,

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fn from_iter<T>(iter: T) -> Value
where T: IntoIterator<Item = (K, V)>,

Creates a value from an iterator. Read more
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impl<V> FromIterator<V> for Value
where V: Into<Value>,

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fn from_iter<T>(iter: T) -> Value
where T: IntoIterator<Item = V>,

Creates a value from an iterator. Read more
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impl Hash for Value

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fn hash<H>(&self, state: &mut H)
where H: Hasher,

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for Value

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fn cmp(&self, other: &Value) -> Ordering

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for Value

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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 PartialOrd for Value

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fn partial_cmp(&self, other: &Value) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

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

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

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

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 · source§

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

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for Value

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fn serialize<S>( &self, serializer: 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 TryFrom<Value> for Arc<str>

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type Error = Error

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

Performs the conversion.
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impl TryFrom<Value> for Kwargs

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type Error = Error

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

Performs the conversion.
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impl TryFrom<Value> for i32

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value) -> Result<i32, <i32 as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for i64

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value) -> Result<i64, <i64 as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for u32

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value) -> Result<u32, <u32 as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for u64

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value) -> Result<u64, <u64 as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for u8

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: Value) -> Result<u8, <u8 as TryFrom<Value>>::Error>

Performs the conversion.
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impl Eq for Value

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impl Freeze for Value

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impl<T> Any for T
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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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Compare self to key and return their ordering.
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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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Returns the argument unchanged.

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impl<I> FunctionResult for I
where I: Into<Value>,

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fn into_result(self) -> Result<Value, Error>

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Paint for T
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fn fg(&self, value: Color) -> Painted<&T>

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::Primary.

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fn fixed(&self, color: u8) -> Painted<&T>

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

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fn rgb(&self, r: u8, g: u8, b: u8) -> Painted<&T>

Returns self with the fg() set to Color::Rgb.

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

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

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

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

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

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Returns self with the fg() set to Color::Yellow.

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Returns self with the fg() set to Color::Blue.

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

Returns self with the fg() set to Color::Magenta.

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Returns self with the fg() set to Color::Cyan.

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Returns self with the fg() set to Color::White.

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Returns self with the fg() set to Color::BrightBlack.

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Returns self with the fg() set to Color::BrightRed.

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Returns self with the fg() set to Color::BrightGreen.

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Returns self with the fg() set to Color::BrightYellow.

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Returns self with the fg() set to Color::BrightBlue.

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Returns self with the fg() set to Color::BrightMagenta.

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

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Returns self with the bg() set to Color::Primary.

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Returns self with the bg() set to Color::Fixed.

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Returns self with the bg() set to Color::Rgb.

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Returns self with the bg() set to Color::Black.

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Returns self with the bg() set to Color::Red.

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Returns self with the bg() set to Color::Green.

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Returns self with the bg() set to Color::Yellow.

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Returns self with the bg() set to Color::Blue.

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Returns self with the bg() set to Color::Magenta.

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Returns self with the bg() set to Color::Cyan.

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Returns self with the bg() set to Color::White.

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Returns self with the bg() set to Color::BrightBlack.

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Returns self with the bg() set to Color::BrightRed.

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Returns self with the bg() set to Color::BrightGreen.

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Returns self with the bg() set to Color::BrightYellow.

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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::BrightCyan.

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

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fn attr(&self, value: Attribute) -> Painted<&T>

Enables the styling Attribute value.

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Make text bold using using bold().

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Returns self with the attr() set to Attribute::Bold.

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Returns self with the attr() set to Attribute::Underline.

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Returns self with the attr() set to Attribute::Invert.

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Returns self with the attr() set to Attribute::Conceal.

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Enables the yansi Quirk value.

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👎Deprecated since 1.0.1: renamed to resetting() due to conflicts with Vec::clear(). The clear() method will be removed in a future release.

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Create a new Painted with a default Style. Read more
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fn paint<S>(&self, style: S) -> Painted<&Self>
where S: Into<Style>,

Apply a style wholesale to self. Any previous style is replaced. Read more
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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> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where 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 T
where 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<T, U> Upcast<T> for U
where T: UpcastFrom<U>,

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fn upcast(self) -> T

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impl<T, B> UpcastFrom<Counter<T, B>> for T

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fn upcast_from(value: Counter<T, B>) -> T

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impl<V, T> VZip<V> for T
where 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
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impl<T> CustomEndpoint for T
where T: Display + Debug + Sync + Send + Any,

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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,