Struct ConstValue

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pub struct ConstValue { /* private fields */ }

Expand description

A constant value.

Implementations§

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impl ConstValue

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pub fn string(value: impl AsRef<str>) -> Result<ConstValue, RuntimeError>

Construct a constant value that is a string.

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pub fn bytes(value: impl AsRef<[u8]>) -> Result<ConstValue, RuntimeError>

Construct a constant value that is bytes.

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pub fn tuple(fields: Box<[ConstValue]>) -> Result<ConstValue, RuntimeError>

Construct a new tuple constant value.

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pub fn for_struct<const N: usize>( hash: Hash, fields: [ConstValue; N], ) -> Result<ConstValue, RuntimeError>

Construct a constant value for a struct.

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pub fn as_integer<T>(&self) -> Result<T, RuntimeError>
where T: TryFrom<i64> + TryFrom<u64>,

Try to coerce the current value as the specified integer T.

§Examples

let value = rune::to_const_value(u32::MAX)?;

assert_eq!(value.as_integer::<u64>()?, u32::MAX as u64);
assert!(value.as_integer::<i32>().is_err());

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pub fn as_ordering(&self) -> Result<Ordering, RuntimeError>

Coerce into Ordering.

This gets a copy of the value.

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pub fn as_ordering_mut(&mut self) -> Result<&mut Ordering, RuntimeError>

Coerce into Ordering.

This gets the value by mutable reference.

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pub fn as_bool(&self) -> Result<bool, RuntimeError>

Coerce into bool.

This gets a copy of the value.

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pub fn as_bool_mut(&mut self) -> Result<&mut bool, RuntimeError>

Coerce into bool.

This gets the value by mutable reference.

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pub fn as_char(&self) -> Result<char, RuntimeError>

Coerce into char.

This gets a copy of the value.

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pub fn as_char_mut(&mut self) -> Result<&mut char, RuntimeError>

Coerce into char.

This gets the value by mutable reference.

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pub fn as_unsigned(&self) -> Result<u64, RuntimeError>

Coerce into u64 unsigned integer.

This gets a copy of the value.

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pub fn as_unsigned_mut(&mut self) -> Result<&mut u64, RuntimeError>

Coerce into u64 unsigned integer.

This gets the value by mutable reference.

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pub fn as_signed(&self) -> Result<i64, RuntimeError>

Coerce into i64 signed integer.

This gets a copy of the value.

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pub fn as_signed_mut(&mut self) -> Result<&mut i64, RuntimeError>

Coerce into i64 signed integer.

This gets the value by mutable reference.

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pub fn as_float(&self) -> Result<f64, RuntimeError>

Coerce into f64 float.

This gets a copy of the value.

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pub fn as_float_mut(&mut self) -> Result<&mut f64, RuntimeError>

Coerce into f64 float.

This gets the value by mutable reference.

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pub fn as_type(&self) -> Result<Type, RuntimeError>

Coerce into Type.

This gets a copy of the value.

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pub fn as_type_mut(&mut self) -> Result<&mut Type, RuntimeError>

Coerce into Type.

This gets the value by mutable reference.

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pub fn into_tuple(self) -> Result<Box<[ConstValue]>, ExpectedType>

Coerce into tuple.

Trait Implementations§

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impl Debug for ConstValue

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

Formats the value using the given formatter. Read more

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impl<'de, A> Decode<'de, Binary, A> for ConstValue
where __A: Allocator,

Available on crate feature musli only.

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const IS_BITWISE_DECODE: bool = false

Whether the type is packed. Packed types can be bitwise copied if the representation of the serialization format is identical to the memory layout of the type. Read more

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fn decode<T0>(_1: T0) -> Result<Self, <T0 as Decoder<'de>>::Error>
where T0: Decoder<'de, Mode = Binary, Allocator = __A>,

Decode the current value.

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impl<'de, A> Decode<'de, Text, A> for ConstValue
where __A: Allocator,

Available on crate feature musli only.

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const IS_BITWISE_DECODE: bool = false

Whether the type is packed. Packed types can be bitwise copied if the representation of the serialization format is identical to the memory layout of the type. Read more

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fn decode<T0>(_1: T0) -> Result<Self, <T0 as Decoder<'de>>::Error>
where T0: Decoder<'de, Mode = Text, Allocator = __A>,

Decode the current value.

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impl<'de> Deserialize<'de> for ConstValue

Available on crate feature serde only.

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

Deserialize this value from the given Serde deserializer. Read more

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impl Encode<Binary> for ConstValue

Available on crate feature musli only.

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const IS_BITWISE_ENCODE: bool = false

Whether the type is packed. Packed types can be bitwise copied if the representation of the serialization format is identical to the memory layout of the type. Read more

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type Encode = ConstValue

The underlying type being encoded. Read more

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fn encode<T0>(&self, _0: T0) -> Result<(), <T0 as Encoder>::Error>
where T0: Encoder<Mode = Binary>,

Encode the given output.

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fn size_hint(&self) -> Option<usize>

The number of fields in the type.

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fn as_encode(&self) -> &Self::Encode

Coerce into the underlying value being encoded.

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impl Encode<Text> for ConstValue

Available on crate feature musli only.

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const IS_BITWISE_ENCODE: bool = false

Whether the type is packed. Packed types can be bitwise copied if the representation of the serialization format is identical to the memory layout of the type. Read more

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type Encode = ConstValue

The underlying type being encoded. Read more

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fn encode<T0>(&self, _0: T0) -> Result<(), <T0 as Encoder>::Error>
where T0: Encoder<Mode = Text>,

Encode the given output.

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fn size_hint(&self) -> Option<usize>

The number of fields in the type.

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fn as_encode(&self) -> &Self::Encode

Coerce into the underlying value being encoded.

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