Struct GroupsAttr

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struct GroupsAttr {
    frame: SEXP,
    rows: SEXP,
}

Expand description

A grouped frame’s groups attribute after the structural checks of DataFrame::groups_attr.

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§frame: SEXP

The groups data frame: a list inheriting from data.frame, with at least one column.

§rows: SEXP

Its last column, .rows: a list of integer vectors, one per group.

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impl GroupsAttr

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fn key_columns(&self) -> Vec<(String, SEXP)>

The grouping-variable columns, by position, with their names: every column not named .rows, keeping only the first column of a repeated name. Their names are dplyr’s group_vars(), setdiff(names(groups), ".rows"). An NA name reads as "", as in DataFrame::names.

Auto Trait Implementations§

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impl UnwindSafe for GroupsAttr

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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