Struct MapFieldData

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struct MapFieldData {
    rust_name: Ident,
    base_name: String,
    key_ty: Type,
    val_ty: Type,
    map_ty: Type,
    tuple_index: Option<Index>,
}

Expand description

Data for ResolvedField::Map (struct path, non-String-keyed maps, #919).

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§rust_name: Ident

Rust field name (for access on the row type).

§base_name: String

Column name base — keys col = <base>_keys, values col = <base>_values.

§key_ty: Type

Key type K.

§val_ty: Type

Value type V.

§map_ty: Type

Full map type HashMap<K,V> / BTreeMap<K,V> (used in reader zip).

§tuple_index: Option<Index>

Index in tuple struct (None for named).

Auto Trait Implementations§

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impl RefUnwindSafe for MapFieldData

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impl UnsafeUnpin for MapFieldData

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impl UnwindSafe for MapFieldData

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into 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> SizeHint for T
where T: ?Sized,

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default fn lower_bound(&self) -> usize

🔬This is a nightly-only experimental API. (core_io_internals)

Returns a lower bound on the number of elements this container-like item contains. For example, an array [u8; 12] could return any value between 0 and 12 inclusively as a correct implementation. Read more

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default fn upper_bound(&self) -> Option<usize>

🔬This is a nightly-only experimental API. (core_io_internals)

Returns an upper bound on the number of elements this container-like item contains if it can be determined, otherwise None. Read more

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

🔬This is a nightly-only experimental API. (core_io_internals)

Returns an estimate for the number of elements this container like type contains. Read more

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