Trait glib::value::ToValue

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pub trait ToValue {
    // Required methods
    fn to_value(&self) -> Value;
    fn value_type(&self) -> Type;
}
Expand description

Trait to convert a value to a Value.

Similar to other common conversion traits, the following invariants are guaranteed:

  • Invertibility: x.to_value().get().unwrap() == x. In words, FromValue is the inverse of ToValue.
  • Idempotence: x.to_value() == x.to_value().to_value(). In words, applying ToValue multiple times yields the same result as applying it once. Idempotence also applies the other way around: value.get::<Value>() is a no-op.

There is also the possibility to wrap values within values, see BoxedValue. All (un-)boxing needs to be done manually, and will be preserved under the conversion methods.

The conversion methods may cause values to be cloned, which may result in reference counter changes or heap allocations depending on the source and target type.

Required Methods§

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fn to_value(&self) -> Value

Convert a value to a Value.

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fn value_type(&self) -> Type

Returns the type identifier of self.

This is the type of the value to be returned by to_value.

Implementations on Foreign Types§

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impl ToValue for &str

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impl ToValue for &Path

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impl ToValue for bool

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impl ToValue for char

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impl ToValue for f32

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impl ToValue for f64

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impl ToValue for i8

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impl ToValue for i32

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impl ToValue for i64

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impl ToValue for str

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impl ToValue for u8

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impl ToValue for u32

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impl ToValue for u64

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impl ToValue for Box<str>

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impl ToValue for String

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impl ToValue for Vec<GString>

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impl ToValue for Vec<String>

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impl ToValue for NonNull<Pointee>

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impl ToValue for Path

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impl ToValue for PathBuf

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impl ToValue for NonZeroI8

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impl ToValue for NonZeroI32

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impl ToValue for NonZeroI64

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impl ToValue for NonZeroU8

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impl ToValue for NonZeroU32

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impl ToValue for NonZeroU64

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impl<'a> ToValue for &'a [&'a str]

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impl<'a> ToValue for [&'a str]

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impl<T: ToValue + StaticType> ToValue for &T

Blanket implementation for all references.

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impl<T: ToValueOptional + StaticType> ToValue for Option<T>

Blanket implementation for all optional types.

Implementors§