pub struct Poly<T>(pub T);
Expand description
Wrapper type around a function for polymorphic maps and folds.
This is a thin generic wrapper type that is used to differentiate
between single-typed generic closures F
that implements, say, Fn(i8) -> bool
,
and a Poly-typed F
that implements multiple Function types
via the Func
trait. (say, Func<i8, Output=bool>
and Func<bool, Output=f32>
)
This is needed because there are completely generic impls for many of the
HList traits that take a simple unwrapped closure.
Performs copy-assignment from
source
.
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Use functions to fold a coproduct into a single value.
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Formats the value using the given formatter.
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Returns the “default value” for a type.
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Apply a function to each element of an HList.
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Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Extract a subset of the possible types in a coproduct (or get the remaining possibilities)
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
Performs the indexed conversion.
Consumes the current HList and returns an HList with the requested shape.
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The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
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Uses borrowed data to replace owned data, usually by cloning.
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.