Struct gdnative_core::core_types::Variant

pub struct Variant(_);

A Variant can represent all Godot values (core types or Object class instances).

The underlying data is either stored inline or reference-counted on the heap, depending on the size of the type and whether the it is trivially copyable.

If you compile godot-rust with the serde feature enabled, you will have access to serialization/deserialization support: the traits Serialize and Deserialize will be automatically implemented on VariantDispatch as well as most of the types in core_types.

Implementations

impl Variant

pub fn new<T: OwnedToVariant>(from: T) -> Self

Creates a Variant from a value that implements ToVariant.

pub fn nil() -> Self

Creates an empty Variant.

pub fn to<T: FromVariant>(&self) -> Option<T>

Performs a strongly-typed, structure-aware conversion to T from this variant, if it is a valid representation of said type. This is the same as T::from_variant(self).ok().

This is the same conversion used to parse arguments of exported methods. See FromVariant for more details.

pub fn try_to<T: FromVariant>(&self) -> Result<T, FromVariantError>

Performs a strongly-typed, structure-aware conversion to T from this variant, if it is a valid representation of said type. This is the same as T::from_variant(self).

This is the same conversion used to parse arguments of exported methods. See FromVariant for more details.

pub fn coerce_to<T: CoerceFromVariant>(&self) -> T

Coerce a value of type T out of this variant, through what Godot presents as a “best-effort” conversion, possibly returning a default value.

See CoerceFromVariant for more details.

See also Variant::to and Variant::try_to for strongly-typed, structure-aware conversions into Rust types.

pub fn to_object<T>(&self) -> Option<Ref<T, Shared>>where
    T: GodotObject,

Convenience method to extract a Ref<T, Shared> from this variant, if the type matches. This is the same as Ref::<T, Shared>::from_variant(self).ok().

This is the same conversion used to parse arguments of exported methods. See FromVariant for more details.

pub fn try_to_object<T>(&self) -> Result<Ref<T, Shared>, FromVariantError>where
    T: GodotObject,

Convenience method to extract a Ref<T, Shared> from this variant, if the type matches. This is the same as Ref::<T, Shared>::from_variant(self).

This is the same conversion used to parse arguments of exported methods. See FromVariant for more details.

pub fn get_type(&self) -> VariantType

Returns this variant’s type.

pub fn dispatch(&self) -> VariantDispatch

Converts this variant to a primitive value depending on its type.

Examples

let variant = 42.to_variant();
let number_as_float = match variant.dispatch() {
    VariantDispatch::I64(i) => i as f64,
    VariantDispatch::F64(f) => f,
    _ => panic!("not a number"),
};
approx::assert_relative_eq!(42.0, number_as_float);

pub fn is_nil(&self) -> bool

Returns true if this is an empty variant.

pub fn has_method(&self, method: impl Into<GodotString>) -> bool

pub unsafe fn call(
    &mut self,
    method: impl Into<GodotString>,
    args: &[Variant]
) -> Result<Variant, CallError>

Invokes a method on the held object.

Safety

This method may invoke [Object::call()] internally, which is unsafe, as it allows execution of arbitrary code (including user-defined code in GDScript or unsafe Rust).

pub fn evaluate(
    &self,
    op: VariantOperator,
    rhs: &Self
) -> Result<Variant, InvalidOp>

Evaluates a variant operator on self and rhs and returns the result on success.

Errors

Returns Err(InvalidOp) if the result is not valid.

Trait Implementations

impl Clone for Variant

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Variant

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

Formats the value using the given formatter.

impl Default for Variant

fn default() -> Self

Returns the “default value” for a type.

impl Display for Variant

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

Formats the value using the given formatter.

impl Drop for Variant

fn drop(&mut self)

Executes the destructor for this type.

impl<'a> From<&'a Variant> for VariantDispatch

fn from(v: &'a Variant) -> Self

Converts to this type from the input type.

impl<'a> From<&'a VariantDispatch> for Variant

fn from(v: &'a VariantDispatch) -> Self

Converts to this type from the input type.

impl FromVariant for Variant

fn from_variant(variant: &Variant) -> Result<Self, FromVariantError>

impl Ord for Variant

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: PartialOrd<Self>,

Restrict a value to a certain interval.

impl PartialEq<Variant> for Variant

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

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

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.

impl PartialOrd<Variant> for Variant

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

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl ToVariant for Variant

fn to_variant(&self) -> Variant

impl Eq for Variant

impl ToVariantEq for Variant