Trait PartialReflect

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pub trait PartialReflect:
    DynamicTypePath
    + Send
    + Sync
    + 'static {
Show 19 methods    // Required methods
    fn get_represented_type_info(&self) -> Option<&'static TypeInfo>;
    fn into_partial_reflect(self: Box<Self>) -> Box<dyn PartialReflect>;
    fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static);
    fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static);
    fn try_into_reflect(
        self: Box<Self>,
    ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>;
    fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>;
    fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>;
    fn try_apply(
        &mut self,
        value: &(dyn PartialReflect + 'static),
    ) -> Result<(), ApplyError>;
    fn reflect_ref(&self) -> ReflectRef<'_>;
    fn reflect_mut(&mut self) -> ReflectMut<'_>;
    fn reflect_owned(self: Box<Self>) -> ReflectOwned;
    fn clone_value(&self) -> Box<dyn PartialReflect>;

    // Provided methods
    fn apply(&mut self, value: &(dyn PartialReflect + 'static)) { ... }
    fn reflect_kind(&self) -> ReflectKind { ... }
    fn reflect_hash(&self) -> Option<u64> { ... }
    fn reflect_partial_eq(
        &self,
        _value: &(dyn PartialReflect + 'static),
    ) -> Option<bool> { ... }
    fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error> { ... }
    fn serializable(&self) -> Option<Serializable<'_>> { ... }
    fn is_dynamic(&self) -> bool { ... }
}

Expand description

The foundational trait of bevy_reflect, used for accessing and modifying data dynamically.

This is a supertrait of Reflect, meaning any type which implements Reflect implements PartialReflect by definition.

It’s recommended to use the derive macro for Reflect rather than manually implementing this trait. Doing so will automatically implement this trait as well as many other useful traits for reflection, including one of the appropriate subtraits: Struct, TupleStruct or Enum.

See the crate-level documentation to see how this trait and its subtraits can be used.

Required Methods§

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fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

For most types, this will simply return their own TypeInfo. However, for dynamic types, such as DynamicStruct or DynamicList, this will return the type they represent (or None if they don’t represent any particular type).

This method is great if you have an instance of a type or a dyn Reflect, and want to access its TypeInfo. However, if this method is to be called frequently, consider using TypeRegistry::get_type_info as it can be more performant for such use cases.

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fn into_partial_reflect(self: Box<Self>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

This is useful for coercing trait objects.

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fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

This is useful for coercing trait objects.

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fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

This is useful for coercing trait objects.

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fn try_into_reflect( self: Box<Self>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

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fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

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fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

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fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

Functions the same as the apply function but returns an error instead of panicking.

§Handling Errors

This function may leave self in a partially mutated state if a error was encountered on the way. consider maintaining a cloned instance of this data you can switch to if a error is encountered.

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fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

See ReflectRef.

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fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

See ReflectMut.

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fn reflect_owned(self: Box<Self>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

See ReflectOwned.

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fn clone_value(&self) -> Box<dyn PartialReflect>

Clones the value as a Reflect trait object.

When deriving Reflect for a struct, tuple struct or enum, the value is cloned via Struct::clone_dynamic, TupleStruct::clone_dynamic, or Enum::clone_dynamic, respectively. Implementors of other Reflect subtraits (e.g. List, Map) should use those subtraits’ respective clone_dynamic methods.

Provided Methods§

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fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

If a type implements an introspection subtrait, then the semantics of this method are as follows:

If T is a Struct, then the value of each named field of value is applied to the corresponding named field of self. Fields which are not present in both structs are ignored.
If T is a TupleStruct or Tuple, then the value of each numbered field is applied to the corresponding numbered field of self. Fields which are not present in both values are ignored.
If T is an Enum, then the variant of self is updated to match the variant of value. The corresponding fields of that variant are applied from value onto self. Fields which are not present in both values are ignored.
If T is a List or Array, then each element of value is applied to the corresponding element of self. Up to self.len() items are applied, and excess elements in value are appended to self.
If T is a Map, then for each key in value, the associated value is applied to the value associated with the same key in self. Keys which are not present in self are inserted.
If T is none of these, then value is downcast to T, cloned, and assigned to self.

Note that Reflect must be implemented manually for Lists and Maps in order to achieve the correct semantics, as derived implementations will have the semantics for Struct, TupleStruct, Enum or none of the above depending on the kind of type. For lists and maps, use the list_apply and map_apply helper functions when implementing this method.

§Panics

Derived implementations of this method will panic:

If the type of value is not of the same kind as T (e.g. if T is a List, while value is a Struct).
If T is any complex type and the corresponding fields or elements of self and value are not of the same type.
If T is an opaque type and self cannot be downcast to T

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fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

See ReflectKind.

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fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

If the underlying type does not support hashing, returns None.

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fn reflect_partial_eq( &self, _value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

If the underlying type does not support equality testing, returns None.

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

Debug formatter for the value.

Any value that is not an implementor of other Reflect subtraits (e.g. List, Map), will default to the format: "Reflect(type_path)", where type_path is the type path of the underlying type.

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fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value.

If the underlying type does not support serialization, returns None.

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fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

Dynamic types include the ones built-in to this crate, such as DynamicStruct, DynamicList, and DynamicTuple. However, they may be custom types used as proxies for other types or to facilitate scripting capabilities.

By default, this method will return false.

Trait PartialReflectCopy item path

Required Methods§

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

fn into_partial_reflect(self: Box<Self>) -> Box<dyn PartialReflect>

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

fn try_into_reflect( self: Box<Self>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

§Handling Errors

fn reflect_ref(&self) -> ReflectRef<'_>

fn reflect_mut(&mut self) -> ReflectMut<'_>

fn reflect_owned(self: Box<Self>) -> ReflectOwned

fn clone_value(&self) -> Box<dyn PartialReflect>

Provided Methods§

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

§Panics

fn reflect_kind(&self) -> ReflectKind

fn reflect_hash(&self) -> Option<u64>

fn reflect_partial_eq( &self, _value: &(dyn PartialReflect + 'static), ) -> Option<bool>

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

fn serializable(&self) -> Option<Serializable<'_>>

fn is_dynamic(&self) -> bool

Implementations§

impl dyn PartialReflect

pub fn represents<T>(&self) -> boolwhere T: Reflect + TypePath,

pub fn try_downcast<T>( self: Box<dyn PartialReflect>, ) -> Result<Box<T>, Box<dyn PartialReflect>>where T: Any,

pub fn try_take<T>( self: Box<dyn PartialReflect>, ) -> Result<T, Box<dyn PartialReflect>>where T: Any,

pub fn try_downcast_ref<T>(&self) -> Option<&T>where T: Any,

pub fn try_downcast_mut<T>(&mut self) -> Option<&mut T>where T: Any,

Trait Implementations§

impl Debug for dyn PartialReflect

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

impl TypePath for dyn PartialReflect

fn type_path() -> &'static str

fn short_type_path() -> &'static str

fn type_ident() -> Option<&'static str>

fn crate_name() -> Option<&'static str>

fn module_path() -> Option<&'static str>

Implementations on Foreign Types§

impl PartialReflect for &'static str

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

fn into_partial_reflect(self: Box<&'static str>) -> Box<dyn PartialReflect>

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

fn try_into_reflect( self: Box<&'static str>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

fn reflect_ref(&self) -> ReflectRef<'_>

fn reflect_mut(&mut self) -> ReflectMut<'_>

fn reflect_owned(self: Box<&'static str>) -> ReflectOwned

fn clone_value(&self) -> Box<dyn PartialReflect>

fn reflect_hash(&self) -> Option<u64>

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

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

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

impl PartialReflect for &'static Path

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

fn into_partial_reflect(self: Box<&'static Path>) -> Box<dyn PartialReflect>

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

fn try_into_reflect( self: Box<&'static Path>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

fn reflect_kind(&self) -> ReflectKind

fn reflect_ref(&self) -> ReflectRef<'_>

fn reflect_mut(&mut self) -> ReflectMut<'_>

fn reflect_owned(self: Box<&'static Path>) -> ReflectOwned

fn clone_value(&self) -> Box<dyn PartialReflect>

fn reflect_hash(&self) -> Option<u64>

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

impl PartialReflect for Cow<'static, str>

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

fn into_partial_reflect(self: Box<Cow<'static, str>>) -> Box<dyn PartialReflect>

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

fn try_into_reflect( self: Box<Cow<'static, str>>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Trait PartialReflect

pub fn represents<T>(&self) -> bool
where T: Reflect + TypePath,

pub fn try_downcast<T>( self: Box<dyn PartialReflect>, ) -> Result<Box<T>, Box<dyn PartialReflect>>
where T: Any,

pub fn try_take<T>( self: Box<dyn PartialReflect>, ) -> Result<T, Box<dyn PartialReflect>>
where T: Any,

pub fn try_downcast_ref<T>(&self) -> Option<&T>
where T: Any,

pub fn try_downcast_mut<T>(&mut self) -> Option<&mut T>
where T: Any,

impl PartialReflect for bool
where bool: Any + Send + Sync,

impl PartialReflect for char
where char: Any + Send + Sync,